201771010102常惠琢2018面向对象程序设计（java）第14周学习总结(代码片段)

  1 package gridbag;
  2 
  3 import java.awt.*;
  4 
  5 /**
  6  * This class simplifies the use of the GridBagConstraints class.
  7  * @version 1.01 2004-05-06
  8  * @author Cay Horstmann
  9  */
 10 public class GBC extends GridBagConstraints
 11 
 12    /**
 13     * Constructs a GBC with a given gridx and gridy position and all other grid
 14     * bag constraint values set to the default.
 15     * @param gridx the gridx position
 16     * @param gridy the gridy position
 17     */
 18    public GBC(int gridx, int gridy)
 19    
 20       this.gridx = gridx;
 21       this.gridy = gridy;
 22    
 23 
 24    /**
 25     * Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all
 26     * other grid bag constraint values set to the default.
 27     * @param gridx the gridx position
 28     * @param gridy the gridy position
 29     * @param gridwidth the cell span in x-direction
 30     * @param gridheight the cell span in y-direction
 31     */
 32    public GBC(int gridx, int gridy, int gridwidth, int gridheight)
 33    
 34       this.gridx = gridx;
 35       this.gridy = gridy;
 36       this.gridwidth = gridwidth;
 37       this.gridheight = gridheight;
 38    
 39 
 40    /**
 41     * Sets the anchor.
 42     * @param anchor the anchor value
 43     * @return this object for further modification
 44     */
 45    public GBC setAnchor(int anchor)
 46    
 47       this.anchor = anchor;
 48       return this;
 49    
 50 
 51    /**
 52     * Sets the fill direction.
 53     * @param fill the fill direction
 54     * @return this object for further modification
 55     */
 56    public GBC setFill(int fill)
 57    
 58       this.fill = fill;
 59       return this;
 60    
 61 
 62    /**
 63     * Sets the cell weights.
 64     * @param weightx the cell weight in x-direction
 65     * @param weighty the cell weight in y-direction
 66     * @return this object for further modification
 67     */
 68    public GBC setWeight(double weightx, double weighty)
 69    
 70       this.weightx = weightx;
 71       this.weighty = weighty;
 72       return this;
 73    
 74 
 75    /**
 76     * Sets the insets of this cell.
 77     * @param distance the spacing to use in all directions
 78     * @return this object for further modification
 79     */
 80    public GBC setInsets(int distance)
 81    
 82       this.insets = new Insets(distance, distance, distance, distance);
 83       return this;
 84    
 85 
 86    /**
 87     * Sets the insets of this cell.
 88     * @param top the spacing to use on top
 89     * @param left the spacing to use to the left
 90     * @param bottom the spacing to use on the bottom
 91     * @param right the spacing to use to the right
 92     * @return this object for further modification
 93     */
 94    public GBC setInsets(int top, int left, int bottom, int right)
 95    
 96       this.insets = new Insets(top, left, bottom, right);
 97       return this;
 98    
 99 
100    /**
101     * Sets the internal padding
102     * @param ipadx the internal padding in x-direction
103     * @param ipady the internal padding in y-direction
104     * @return this object for further modification
105     */
106    public GBC setIpad(int ipadx, int ipady)
107    
108       this.ipadx = ipadx;
109       this.ipady = ipady;
110       return this;
111    
112 

package calculator;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * A panel with calculator buttons and a result display.
 */
public class CalculatorPanel extends JPanel

   private JButton display;
   private JPanel panel;
   private double result;
   private String lastCommand;
   private boolean start;

   public CalculatorPanel()
   
      setLayout(new BorderLayout());

      result = 0;
      lastCommand = "=";
      start = true;

      // add the display

      display = new JButton("0");
      display.setEnabled(false);
      add(display, BorderLayout.NORTH);

      ActionListener insert = new InsertAction();
      ActionListener command = new CommandAction();

      // add the buttons in a 4 x 4 grid

      panel = new JPanel();
      panel.setLayout(new GridLayout(4, 4));

      addButton("3", insert);
      addButton("6", insert);
      addButton("9", insert);//数字用insert
      addButton("+", command);//命令用command

      addButton("2", insert);
      addButton("5", insert);
      addButton("8", insert);
      addButton("-", command);

      addButton("1", insert);
      addButton("4", insert);
      addButton("7", insert);
      addButton("*", command);

      addButton("0", insert);
      addButton(".", insert);
      addButton("=", command);
      addButton("/", command);

      add(panel, BorderLayout.CENTER);
      //add(display, BorderLayout.NORTH);CENTER
   
      
      JButton b1 = new JButton("验证");
      add(b1,BorderLayout.SOUTH);
      
      JButton br = new JButton("验证1");
      add(br,BorderLayout.WEST);
      
      JButton b2 = new JButton("验证2");
      add(b2,BorderLayout.EAST);
   

   /**
    * Adds a button to the center panel.
    * @param label the button label
    * @param listener the button listener
    */
   private void addButton(String label, ActionListener listener)
   
      JButton button = new JButton(label);
      button.addActionListener(listener);
      panel.add(button);
   

   /**
    * This action inserts the button action string to the end of the display text.
    */
   private class InsertAction implements ActionListener
   
      public void actionPerformed(ActionEvent event)
      
         String input = event.getActionCommand();
         if (start)
         
            display.setText("");
            start = false;
         
         display.setText(display.getText() + input);
      
   

   /**
    * This action executes the command that the button action string denotes.
    */
   private class CommandAction implements ActionListener
   
      public void actionPerformed(ActionEvent event)
      
         String command = event.getActionCommand();

         if (start)
         
            if (command.equals("-"))
            
               display.setText(command);
               start = false;
            
            else lastCommand = command;
         
         else
         
            calculate(Double.parseDouble(display.getText()));//用parseDouble把字符串转换成对应的数据
            lastCommand = command;
            start = true;
         
      
   

   /**
    * Carries out the pending calculation.
    * @param x the value to be accumulated with the prior result.
    */
   public void calculate(double x)
   
      if (lastCommand.equals("+")) result += x;
      else if (lastCommand.equals("-")) result -= x;
      else if (lastCommand.equals("*")) result *= x;
      else if (lastCommand.equals("/")) result /= x;
      else if (lastCommand.equals("=")) result = x;
      display.setText("" + result);//display的更改器方法；""会吧result转换成字符串数据
   

 1 package colorChooser;
 2 
 3 import javax.swing.*;
 4 
 5 /**
 6  * A frame with a color chooser panel
 7  */
 8 public class ColorChooserFrame extends JFrame
 9 
10    private static final int DEFAULT_WIDTH = 300;
11    private static final int DEFAULT_HEIGHT = 200;
12 
13    public ColorChooserFrame()
14          
15       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
16 
17       // add color chooser panel to frame
18 
19       ColorChooserPanel panel = new ColorChooserPanel();
20       add(panel);
21    
22 

 1 package colorChooser;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.04 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class ColorChooserTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new ColorChooserFrame();
16          frame.setTitle("ColorChooserTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package text;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.41 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class TextComponentTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new TextComponentFrame();
16          frame.setTitle("TextComponentTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package text;
 2 
 3 import java.awt.BorderLayout;
 4 import java.awt.GridLayout;
 5 
 6 import javax.swing.JButton;
 7 import javax.swing.JFrame;
 8 import javax.swing.JLabel;
 9 import javax.swing.JPanel;
10 import javax.swing.JPasswordField;
11 import javax.swing.JScrollPane;
12 import javax.swing.JTextArea;
13 import javax.swing.JTextField;
14 import javax.swing.SwingConstants;
15 
16 /**
17  * A frame with sample text components.
18  */
19 public class TextComponentFrame extends JFrame
20 
21    public static final int TEXTAREA_ROWS = 8;
22    public static final int TEXTAREA_COLUMNS = 20;
23 
24    public TextComponentFrame()
25    
26       JTextField textField = new JTextField();
27       JPasswordField passwordField = new JPasswordField();
28 
29       JPanel northPanel = new JPanel();
30       northPanel.setLayout(new GridLayout(2, 2));
31       northPanel.add(new JLabel("User name: ", SwingConstants.RIGHT));
32       northPanel.add(textField);
33       northPanel.add(new JLabel("Password: ", SwingConstants.RIGHT));
34       northPanel.add(passwordField);
35 
36       add(northPanel, BorderLayout.NORTH);
37 
38       JTextArea textArea = new JTextArea(TEXTAREA_ROWS, TEXTAREA_COLUMNS);
39       JScrollPane scrollPane = new JScrollPane(textArea);
40 
41       add(scrollPane, BorderLayout.CENTER);
42 
43       // add button to append text into the text area
44 
45       JPanel southPanel = new JPanel();
46 
47       JButton insertButton = new JButton("Insert");
48       southPanel.add(insertButton);
49       insertButton.addActionListener(event ->
50          textArea.append("User name: " + textField.getText() + " Password: "
51             + new String(passwordField.getPassword()) + "
"));
52 
53       add(southPanel, BorderLayout.SOUTH);
54       pack();
55    
56 

 1 package checkBox;
 2 
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * A frame with a sample text label and check boxes for selecting font
 9  * attributes.
10  */
11 public class CheckBoxFrame extends JFrame
12 
13    private JLabel label;
14    private JCheckBox bold;
15    private JCheckBox italic;
16    private static final int FONTSIZE = 24;
17 
18    public CheckBoxFrame()
19    
20       // add the sample text label
21 
22       label = new JLabel("ijnjoijojoippkp[kpiooijoijnnjnoi-=0");
23       label.setFont(new Font("Serif", Font.BOLD, FONTSIZE));
24       add(label, BorderLayout.CENTER);
25 
26       // this listener sets the font attribute of
27       // the label to the check box state
28 
29       ActionListener listener = event -> 
30          int mode = 0;
31          if (bold.isSelected()) mode += Font.BOLD;
32          if (italic.isSelected()) mode += Font.ITALIC;
33          label.setFont(new Font("Serif", mode, FONTSIZE));
34       ;
35 
36       // add the check boxes
37 
38       JPanel buttonPanel = new JPanel();
39 
40       bold = new JCheckBox("Bold");
41       bold.addActionListener(listener);
42       bold.setSelected(true);
43       buttonPanel.add(bold);
44 
45       italic = new JCheckBox("Italic");
46       italic.addActionListener(listener);
47       buttonPanel.add(italic);
48 
49       add(buttonPanel, BorderLayout.SOUTH);
50       pack();
51    
52 

 1 package checkBox;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class CheckBoxTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new CheckBoxFrame();
16          frame.setTitle("CheckBoxTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package radioButton;
 2 
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * A frame with a sample text label and radio buttons for selecting font sizes.
 9  */
10 public class RadioButtonFrame extends JFrame
11 
12    private JPanel buttonPanel;
13    private ButtonGroup group;
14    private JLabel label;
15    private static final int DEFAULT_SIZE = 36;
16 
17    public RadioButtonFrame()
18          
19       // add the sample text label
20 
21       label = new JLabel("The quick brown fox jumps over the lazy dog.");
22       label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
23       add(label, BorderLayout.CENTER);
24 
25       // add the radio buttons
26 
27       buttonPanel = new JPanel();
28       group = new ButtonGroup();
29 
30       addRadioButton("Small", 8);
31       addRadioButton("Medium", 12);
32       addRadioButton("Large", 18);
33       addRadioButton("Extra large", 36);
34 
35       add(buttonPanel, BorderLayout.SOUTH);
36       pack();
37    
38 
39    /**
40     * Adds a radio button that sets the font size of the sample text.
41     * @param name the string to appear on the button
42     * @param size the font size that this button sets
43     */
44    public void addRadioButton(String name, int size)
45    
46       boolean selected = size == DEFAULT_SIZE;
47       JRadioButton button = new JRadioButton(name, selected);
48       group.add(button);
49       buttonPanel.add(button);
50 
51       // this listener sets the label font size
52 
53       ActionListener listener = event -> label.setFont(new Font("Serif", Font.PLAIN, size));
54 
55       button.addActionListener(listener);
56    
57 

 1 package radioButton;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class RadioButtonTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new RadioButtonFrame();
16          frame.setTitle("RadioButtonTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package border;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 import javax.swing.border.*;
 6 
 7 /**
 8  * A frame with radio buttons to pick a border style.
 9  */
10 public class BorderFrame extends JFrame
11 
12    private JPanel demoPanel;
13    private JPanel buttonPanel;
14    private ButtonGroup group;
15 
16    public BorderFrame()
17    
18       demoPanel = new JPanel();
19       buttonPanel = new JPanel();
20       group = new ButtonGroup();
21 
22       addRadioButton("Lowered bevel", BorderFactory.createLoweredBevelBorder());
23       addRadioButton("Raised bevel", BorderFactory.createRaisedBevelBorder());
24       addRadioButton("Etched", BorderFactory.createEtchedBorder());
25       addRadioButton("Line", BorderFactory.createLineBorder(Color.BLUE));
26       addRadioButton("Matte", BorderFactory.createMatteBorder(10, 10, 10, 10, Color.BLUE));
27       addRadioButton("Empty", BorderFactory.createEmptyBorder());
28 
29       Border etched = BorderFactory.createEtchedBorder();
30       Border titled = BorderFactory.createTitledBorder(etched, "Border types");
31       buttonPanel.setBorder(titled);
32 
33       setLayout(new GridLayout(2, 1));
34       add(buttonPanel);
35       add(demoPanel);
36       pack();
37    
38 
39    public void addRadioButton(String buttonName, Border b)
40    
41       JRadioButton button = new JRadioButton(buttonName);
42       button.addActionListener(event -> demoPanel.setBorder(b));
43       group.add(button);
44       buttonPanel.add(button);
45    
46 

 1 package border;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2015-06-13
 8  * @author Cay Horstmann
 9  */
10 public class BorderTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new BorderFrame();
16          frame.setTitle("BorderTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package comboBox;
 2 
 3 import java.awt.BorderLayout;
 4 import java.awt.Font;
 5 
 6 import javax.swing.JComboBox;
 7 import javax.swing.JFrame;
 8 import javax.swing.JLabel;
 9 import javax.swing.JPanel;
10 
11 /**
12  * A frame with a sample text label and a combo box for selecting font faces.
13  */
14 public class ComboBoxFrame extends JFrame
15 
16    private JComboBox<String> faceCombo;
17    private JLabel label;
18    private static final int DEFAULT_SIZE = 24;
19 
20    public ComboBoxFrame()
21    
22       // add the sample text label
23 
24       label = new JLabel("The quick brown fox jumps over the lazy dog.");
25       label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
26       add(label, BorderLayout.CENTER);
27 
28       // make a combo box and add face names
29 
30       faceCombo = new JComboBox<>();
31       faceCombo.addItem("Serif");
32       faceCombo.addItem("SansSerif");
33       faceCombo.addItem("Monospaced");
34       faceCombo.addItem("Dialog");
35       faceCombo.addItem("DialogInput");
36 
37       // the combo box listener changes the label font to the selected face name
38 
39       faceCombo.addActionListener(event ->
40          label.setFont(
41             new Font(faceCombo.getItemAt(faceCombo.getSelectedIndex()), 
42                Font.PLAIN, DEFAULT_SIZE)));
43 
44       // add combo box to a panel at the frame‘s southern border
45 
46       JPanel comboPanel = new JPanel();
47       comboPanel.add(faceCombo);
48       add(comboPanel, BorderLayout.SOUTH);
49       pack();
50    
51 

 1 package comboBox;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.35 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class ComboBoxTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new ComboBoxFrame();
16          frame.setTitle("ComboBoxTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

  1 package slider;
  2 
  3 import java.awt.*;
  4 import java.util.*;
  5 import javax.swing.*;
  6 import javax.swing.event.*;
  7 
  8 /**
  9  * A frame with many sliders and a text field to show slider values.
 10  */
 11 public class SliderFrame extends JFrame
 12 
 13    private JPanel sliderPanel;
 14    private JTextField textField;
 15    private ChangeListener listener;
 16 
 17    public SliderFrame()
 18    
 19       sliderPanel = new JPanel();
 20       sliderPanel.setLayout(new GridBagLayout());
 21 
 22       // common listener for all sliders
 23       listener = event -> 
 24          // update text field when the slider value changes
 25          JSlider source = (JSlider) event.getSource();
 26          textField.setText("" + source.getValue());
 27       ;
 28 
 29       // add a plain slider
 30 
 31       JSlider slider = new JSlider();
 32       addSlider(slider, "Plain");
 33 
 34       // add a slider with major and minor ticks
 35 
 36       slider = new JSlider();
 37       slider.setPaintTicks(true);
 38       slider.setMajorTickSpacing(20);
 39       slider.setMinorTickSpacing(5);
 40       addSlider(slider, "Ticks");
 41 
 42       // add a slider that snaps to ticks
 43 
 44       slider = new JSlider();
 45       slider.setPaintTicks(true);
 46       slider.setSnapToTicks(true);
 47       slider.setMajorTickSpacing(20);
 48       slider.setMinorTickSpacing(5);
 49       addSlider(slider, "Snap to ticks");
 50 
 51       // add a slider with no track
 52 
 53       slider = new JSlider();
 54       slider.setPaintTicks(true);
 55       slider.setMajorTickSpacing(20);
 56       slider.setMinorTickSpacing(5);
 57       slider.setPaintTrack(false);
 58       addSlider(slider, "No track");
 59 
 60       // add an inverted slider
 61 
 62       slider = new JSlider();
 63       slider.setPaintTicks(true);
 64       slider.setMajorTickSpacing(20);
 65       slider.setMinorTickSpacing(5);
 66       slider.setInverted(true);
 67       addSlider(slider, "Inverted");
 68 
 69       // add a slider with numeric labels
 70 
 71       slider = new JSlider();
 72       slider.setPaintTicks(true);
 73       slider.setPaintLabels(true);
 74       slider.setMajorTickSpacing(20);
 75       slider.setMinorTickSpacing(5);
 76       addSlider(slider, "Labels");
 77 
 78       // add a slider with alphabetic labels
 79 
 80       slider = new JSlider();
 81       slider.setPaintLabels(true);
 82       slider.setPaintTicks(true);
 83       slider.setMajorTickSpacing(20);
 84       slider.setMinorTickSpacing(5);
 85 
 86       Dictionary<Integer, Component> labelTable = new Hashtable<>();
 87       labelTable.put(0, new JLabel("A"));
 88       labelTable.put(20, new JLabel("B"));
 89       labelTable.put(40, new JLabel("C"));
 90       labelTable.put(60, new JLabel("D"));
 91       labelTable.put(80, new JLabel("E"));
 92       labelTable.put(100, new JLabel("F"));
 93 
 94       slider.setLabelTable(labelTable);
 95       addSlider(slider, "Custom labels");
 96 
 97       // add a slider with icon labels
 98 
 99       slider = new JSlider();
100       slider.setPaintTicks(true);
101       slider.setPaintLabels(true);
102       slider.setSnapToTicks(true);
103       slider.setMajorTickSpacing(20);
104       slider.setMinorTickSpacing(20);
105 
106       labelTable = new Hashtable<Integer, Component>();
107 
108       // add card images
109 
110       labelTable.put(0, new JLabel(new ImageIcon("nine.gif")));
111       labelTable.put(20, new JLabel(new ImageIcon("ten.gif")));
112       labelTable.put(40, new JLabel(new ImageIcon("jack.gif")));
113       labelTable.put(60, new JLabel(new ImageIcon("queen.gif")));
114       labelTable.put(80, new JLabel(new ImageIcon("king.gif")));
115       labelTable.put(100, new JLabel(new ImageIcon("ace.gif")));
116 
117       slider.setLabelTable(labelTable);
118       addSlider(slider, "Icon labels");
119 
120       // add the text field that displays the slider value
121 
122       textField = new JTextField();
123       add(sliderPanel, BorderLayout.CENTER);
124       add(textField, BorderLayout.SOUTH);
125       pack();
126    
127 
128    /**
129     * Adds a slider to the slider panel and hooks up the listener
130     * @param s the slider
131     * @param description the slider description
132     */
133    public void addSlider(JSlider s, String description)
134    
135       s.addChangeListener(listener);
136       JPanel panel = new JPanel();
137       panel.add(s);
138       panel.add(new JLabel(description));
139       panel.setAlignmentX(Component.LEFT_ALIGNMENT);
140       GridBagConstraints gbc = new GridBagConstraints();
141       gbc.gridy = sliderPanel.getComponentCount();
142       gbc.anchor = GridBagConstraints.WEST;
143       sliderPanel.add(panel, gbc);
144    
145 

 1 package slider;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.15 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class SliderTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          SliderFrame frame = new SliderFrame();
16          frame.setTitle("SliderTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

  1 package menu;
  2 
  3 import java.awt.event.*;
  4 import javax.swing.*;
  5 
  6 /**
  7  * A frame with a sample menu bar.
  8  */
  9 public class MenuFrame extends JFrame
 10 
 11    private static final int DEFAULT_WIDTH = 300;
 12    private static final int DEFAULT_HEIGHT = 200;
 13    private Action saveAction;
 14    private Action saveAsAction;
 15    private JCheckBoxMenuItem readonlyItem;
 16    private JPopupMenu popup;
 17 
 18    /**
 19     * A sample action that prints the action name to System.out
 20     */
 21    class TestAction extends AbstractAction
 22    
 23       public TestAction(String name)
 24       
 25          super(name);
 26       
 27 
 28       public void actionPerformed(ActionEvent event)
 29       
 30          System.out.println(getValue(Action.NAME) + " selected.");
 31       
 32    
 33 
 34    public MenuFrame()
 35    
 36       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
 37 
 38       JMenu fileMenu = new JMenu("File");
 39       fileMenu.add(new TestAction("New"));
 40 
 41       // demonstrate accelerators
 42 
 43       JMenuItem openItem = fileMenu.add(new TestAction("Open"));
 44       openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
 45 
 46       fileMenu.addSeparator();
 47 
 48       saveAction = new TestAction("Save");
 49       JMenuItem saveItem = fileMenu.add(saveAction);
 50       saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
 51 
 52       saveAsAction = new TestAction("Save As");
 53       fileMenu.add(saveAsAction);
 54       fileMenu.addSeparator();
 55 
 56       fileMenu.add(new AbstractAction("Exit")
 57          
 58             public void actionPerformed(ActionEvent event)
 59             
 60                System.exit(0);
 61             
 62          );
 63 
 64       // demonstrate checkbox and radio button menus
 65 
 66       readonlyItem = new JCheckBoxMenuItem("Read-only");
 67       readonlyItem.addActionListener(new ActionListener()
 68          
 69             public void actionPerformed(ActionEvent event)
 70             
 71                boolean saveOk = !readonlyItem.isSelected();
 72                saveAction.setEnabled(saveOk);
 73                saveAsAction.setEnabled(saveOk);
 74             
 75          );
 76 
 77       ButtonGroup group = new ButtonGroup();
 78 
 79       JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
 80       insertItem.setSelected(true);
 81       JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");
 82 
 83       group.add(insertItem);
 84       group.add(overtypeItem);
 85 
 86       // demonstrate icons
 87 
 88       Action cutAction = new TestAction("Cut");
 89       cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
 90       Action copyAction = new TestAction("Copy");
 91       copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
 92       Action pasteAction = new TestAction("Paste");
 93       pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));
 94 
 95       JMenu editMenu = new JMenu("Edit");
 96       editMenu.add(cutAction);
 97       editMenu.add(copyAction);
 98       editMenu.add(pasteAction);
 99 
100       // demonstrate nested menus
101 
102       JMenu optionMenu = new JMenu("Options");
103 
104       optionMenu.add(readonlyItem);
105       optionMenu.addSeparator();
106       optionMenu.add(insertItem);
107       optionMenu.add(overtypeItem);
108 
109       editMenu.addSeparator();
110       editMenu.add(optionMenu);
111 
112       // demonstrate mnemonics
113 
114       JMenu helpMenu = new JMenu("Help");
115       helpMenu.setMnemonic(‘H‘);
116 
117       JMenuItem indexItem = new JMenuItem("Index");
118       indexItem.setMnemonic(‘I‘);
119       helpMenu.add(indexItem);
120 
121       // you can also add the mnemonic key to an action
122       Action aboutAction = new TestAction("About");
123       aboutAction.putValue(Action.MNEMONIC_KEY, new Integer(‘A‘));
124       helpMenu.add(aboutAction);
125       
126       // add all top-level menus to menu bar
127 
128       JMenuBar menuBar = new JMenuBar();
129       setJMenuBar(menuBar);
130 
131       menuBar.add(fileMenu);
132       menuBar.add(editMenu);
133       menuBar.add(helpMenu);
134 
135       // demonstrate pop-ups
136 
137       popup = new JPopupMenu();
138       popup.add(cutAction);
139       popup.add(copyAction);
140       popup.add(pasteAction);
141 
142       JPanel panel = new JPanel();
143       panel.setComponentPopupMenu(popup);
144       add(panel);
145    
146 

 1 package menu;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.24 2012-06-12
 8  * @author Cay Horstmann
 9  */
10 public class MenuTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new MenuFrame();
16          frame.setTitle("MenuTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package toolBar;
 2 
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * A frame with a toolbar and menu for color changes.
 9  */
10 public class ToolBarFrame extends JFrame
11 
12    private static final int DEFAULT_WIDTH = 300;
13    private static final int DEFAULT_HEIGHT = 200;
14    private JPanel panel;
15 
16    public ToolBarFrame()
17    
18       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
19 
20       // add a panel for color change
21 
22       panel = new JPanel();
23       add(panel, BorderLayout.CENTER);
24 
25       // set up actions
26 
27       Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
28       Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"),
29             Color.YELLOW);
30       Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);
31 
32       Action exitAction = new AbstractAction("Exit", new ImageIcon("exit.gif"))
33          
34             public void actionPerformed(ActionEvent event)
35             
36                System.exit(0);
37             
38          ;
39       exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit");
40 
41       // populate toolbar
42 
43       JToolBar bar = new JToolBar();
44       bar.add(blueAction);
45       bar.add(yellowAction);
46       bar.add(redAction);
47       bar.addSeparator();
48       bar.add(exitAction);
49       add(bar, BorderLayout.NORTH);
50 
51       // populate menu
52 
53       JMenu menu = new JMenu("Color");
54       menu.add(yellowAction);
55       menu.add(blueAction);
56       menu.add(redAction);
57       menu.add(exitAction);
58       JMenuBar menuBar = new JMenuBar();
59       menuBar.add(menu);
60       setJMenuBar(menuBar);
61    
62 
63    /**
64     * The color action sets the background of the frame to a given color.
65     */
66    class ColorAction extends AbstractAction
67    
68       public ColorAction(String name, Icon icon, Color c)
69       
70          putValue(Action.NAME, name);
71          putValue(Action.SMALL_ICON, icon);
72          putValue(Action.SHORT_DESCRIPTION, name + " background");
73          putValue("Color", c);
74       
75 
76       public void actionPerformed(ActionEvent event)
77       
78          Color c = (Color) getValue("Color");
79          panel.setBackground(c);
80       
81    
82 

 1 package toolBar;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.14 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class ToolBarTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          ToolBarFrame frame = new ToolBarFrame();
16          frame.setTitle("ToolBarTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package gridbag;
 2 
 3 import java.awt.Font;
 4 import java.awt.GridBagLayout;
 5 import java.awt.event.ActionListener;
 6 
 7 import javax.swing.BorderFactory;
 8 import javax.swing.JCheckBox;
 9 import javax.swing.JComboBox;
10 import javax.swing.JFrame;
11 import javax.swing.JLabel;
12 import javax.swing.JTextArea;
13 
14 /**
15  * A frame that uses a grid bag layout to arrange font selection components.
16  */
17 public class FontFrame extends JFrame
18 
19    public static final int TEXT_ROWS = 10;
20    public static final int TEXT_COLUMNS = 20;
21 
22    private JComboBox<String> face;
23    private JComboBox<Integer> size;
24    private JCheckBox bold;
25    private JCheckBox italic;
26    private JTextArea sample;
27 
28    public FontFrame()
29    
30       GridBagLayout layout = new GridBagLayout();
31       setLayout(layout);
32 
33       ActionListener listener = event -> updateSample();
34 
35       // construct components
36 
37       JLabel faceLabel = new JLabel("Face: ");
38 
39       face = new JComboBox<>(new String[]  "Serif", "SansSerif", "Monospaced",
40             "Dialog", "DialogInput" );
41 
42       face.addActionListener(listener);
43 
44       JLabel sizeLabel = new JLabel("Size: ");
45 
46       size = new JComboBox<>(new Integer[]  8, 10, 12, 15, 18, 24, 36, 48 );
47 
48       size.addActionListener(listener);
49 
50       bold = new JCheckBox("Bold");
51       bold.addActionListener(listener);
52 
53       italic = new JCheckBox("Italic");
54       italic.addActionListener(listener);
55 
56       sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
57       sample.setText("The quick brown fox jumps over the lazy dog");
58       sample.setEditable(false);
59       sample.setLineWrap(true);
60       sample.setBorder(BorderFactory.createEtchedBorder());
61 
62       // add components to grid, using GBC convenience class
63 
64       add(faceLabel, new GBC(0, 0).setAnchor(GBC.EAST));
65       add(face, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0)
66             .setInsets(1));
67       add(sizeLabel, new GBC(0, 1).setAnchor(GBC.EAST));
68       add(size, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0)
69             .setInsets(1));
70       add(bold, new GBC(0, 2, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
71       add(italic, new GBC(0, 3, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
72       add(sample, new GBC(2, 0, 1, 4).setFill(GBC.BOTH).setWeight(100, 100));
73       pack();
74       updateSample();
75    
76 
77    public void updateSample()
78    
79       String fontFace = (String) face.getSelectedItem();
80       int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
81             + (italic.isSelected() ? Font.ITALIC : 0);
82       int fontSize = size.getItemAt(size.getSelectedIndex());
83       Font font = new Font(fontFace, fontStyle, fontSize);
84       sample.setFont(font);
85       sample.repaint();
86    
87 

 1 package gridbag;
 2 
 3 import java.awt.EventQueue;
 4 
 5 import javax.swing.JFrame;
 6 
 7 /**
 8  * @version 1.35 2015-06-12
 9  * @author Cay Horstmann
10  */
11 public class GridBagLayoutTest
12 
13    public static void main(String[] args)
14    
15       EventQueue.invokeLater(() ->           
16                JFrame frame = new FontFrame();
17                frame.setTitle("GridBagLayoutTest");
18                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
19                frame.setVisible(true);
20          );
21    
22 

  1 package groupLayout;
  2 
  3 import java.awt.Font;
  4 import java.awt.event.ActionListener;
  5 
  6 import javax.swing.BorderFactory;
  7 import javax.swing.GroupLayout;
  8 import javax.swing.JCheckBox;
  9 import javax.swing.JComboBox;
 10 import javax.swing.JFrame;
 11 import javax.swing.JLabel;
 12 import javax.swing.JScrollPane;
 13 import javax.swing.JTextArea;
 14 import javax.swing.LayoutStyle;
 15 import javax.swing.SwingConstants;
 16 
 17 /**
 18  * A frame that uses a group layout to arrange font selection components.
 19  */
 20 public class FontFrame extends JFrame
 21 
 22    public static final int TEXT_ROWS = 10;
 23    public static final int TEXT_COLUMNS = 20;
 24 
 25    private JComboBox<String> face;
 26    private JComboBox<Integer> size;
 27    private JCheckBox bold;
 28    private JCheckBox italic;
 29    private JScrollPane pane;
 30    private JTextArea sample;
 31 
 32    public FontFrame()
 33    
 34       ActionListener listener = event -> updateSample(); 
 35 
 36       // construct components
 37 
 38       JLabel faceLabel = new JLabel("Face: ");
 39 
 40       face = new JComboBox<>(new String[]  "Serif", "SansSerif", "Monospaced", "Dialog",
 41             "DialogInput" );
 42 
 43       face.addActionListener(listener);
 44 
 45       JLabel sizeLabel = new JLabel("Size: ");
 46 
 47       size = new JComboBox<>(new Integer[]  8, 10, 12, 15, 18, 24, 36, 48 );
 48 
 49       size.addActionListener(listener);
 50 
 51       bold = new JCheckBox("Bold");
 52       bold.addActionListener(listener);
 53 
 54       italic = new JCheckBox("Italic");
 55       italic.addActionListener(listener);
 56 
 57       sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
 58       sample.setText("The quick brown fox jumps over the lazy dog");
 59       sample.setEditable(false);
 60       sample.setLineWrap(true);
 61       sample.setBorder(BorderFactory.createEtchedBorder());
 62 
 63       pane = new JScrollPane(sample);
 64 
 65       GroupLayout layout = new GroupLayout(getContentPane());
 66       setLayout(layout);
 67       layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
 68             .addGroup(
 69                   layout.createSequentialGroup().addContainerGap().addGroup(
 70                         layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(
 71                               GroupLayout.Alignment.TRAILING,
 72                               layout.createSequentialGroup().addGroup(
 73                                     layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
 74                                           .addComponent(faceLabel).addComponent(sizeLabel))
 75                                     .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
 76                                     .addGroup(
 77                                           layout.createParallelGroup(
 78                                                 GroupLayout.Alignment.LEADING, false)
 79                                                 .addComponent(size).addComponent(face)))
 80                               .addComponent(italic).addComponent(bold)).addPreferredGap(
 81                         LayoutStyle.ComponentPlacement.RELATED).addComponent(pane)
 82                         .addContainerGap()));
 83 
 84       layout.linkSize(SwingConstants.HORIZONTAL, new java.awt.Component[]  face, size );
 85 
 86       layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
 87             .addGroup(
 88                   layout.createSequentialGroup().addContainerGap().addGroup(
 89                         layout.createParallelGroup(GroupLayout.Alignment.LEADING).addComponent(
 90                               pane, GroupLayout.Alignment.TRAILING).addGroup(
 91                               layout.createSequentialGroup().addGroup(
 92                                     layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
 93                                           .addComponent(face).addComponent(faceLabel))
 94                                     .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
 95                                     .addGroup(
 96                                           layout.createParallelGroup(
 97                                                 GroupLayout.Alignment.BASELINE).addComponent(size)
 98                                                 .addComponent(sizeLabel)).addPreferredGap(
 99                                           LayoutStyle.ComponentPlacement.RELATED).addComponent(
100                                           italic, GroupLayout.DEFAULT_SIZE,
101                                           GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
102                                     .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
103                                     .addComponent(bold, GroupLayout.DEFAULT_SIZE,
104                                           GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
105                         .addContainerGap()));
106       pack();
107    
108    
109    public void updateSample()
110    
111       String fontFace = (String) face.getSelectedItem();
112       int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
113             + (italic.isSelected() ? Font.ITALIC : 0);
114       int fontSize = size.getItemAt(size.getSelectedIndex());
115       Font font = new Font(fontFace, fontStyle, fontSize);
116       sample.setFont(font);
117       sample.repaint();
118    
119 

 1 package groupLayout;
 2 
 3 import java.awt.EventQueue;
 4 
 5 import javax.swing.JFrame;
 6 
 7 /**
 8  * @version 1.01 2015-06-12
 9  * @author Cay Horstmann
10  */
11 public class GroupLayoutTest
12 
13    public static void main(String[] args)
14    
15       EventQueue.invokeLater(() -> 
16          JFrame frame = new FontFrame();
17          frame.setTitle("GroupLayoutTest");
18          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
19          frame.setVisible(true);
20       );
21    
22 

  1 package circleLayout;
  2 
  3 import java.awt.*;
  4 
  5 /**
  6  * A layout manager that lays out components along a circle.
  7  */
  8 public class CircleLayout implements LayoutManager
  9 
 10    private int minWidth = 0;
 11    private int minHeight = 0;
 12    private int preferredWidth = 0;
 13    private int preferredHeight = 0;
 14    private boolean sizesSet = false;
 15    private int maxComponentWidth = 0;
 16    private int maxComponentHeight = 0;
 17 
 18    public void addLayoutComponent(String name, Component comp)
 19    
 20    
 21 
 22    public void removeLayoutComponent(Component comp)
 23    
 24    
 25 
 26    public void setSizes(Container parent)
 27    
 28       if (sizesSet) return;
 29       int n = parent.getComponentCount();
 30 
 31       preferredWidth = 0;
 32       preferredHeight = 0;
 33       minWidth = 0;
 34       minHeight = 0;
 35       maxComponentWidth = 0;
 36       maxComponentHeight = 0;
 37 
 38       // compute the maximum component widths and heights
 39       // and set the preferred size to the sum of the component sizes.
 40       for (int i = 0; i < n; i++)
 41       
 42          Component c = parent.getComponent(i);
 43          if (c.isVisible())
 44          
 45             Dimension d = c.getPreferredSize();
 46             maxComponentWidth = Math.max(maxComponentWidth, d.width);
 47             maxComponentHeight = Math.max(maxComponentHeight, d.height);
 48             preferredWidth += d.width;
 49             preferredHeight += d.height;
 50          
 51       
 52       minWidth = preferredWidth / 2;
 53       minHeight = preferredHeight / 2;
 54       sizesSet = true;
 55    
 56 
 57    public Dimension preferredLayoutSize(Container parent)
 58    
 59       setSizes(parent);
 60       Insets insets = parent.getInsets();
 61       int width = preferredWidth + insets.left + insets.right;
 62       int height = preferredHeight + insets.top + insets.bottom;
 63       return new Dimension(width, height);
 64    
 65 
 66    public Dimension minimumLayoutSize(Container parent)
 67    
 68       setSizes(parent);
 69       Insets insets = parent.getInsets();
 70       int width = minWidth + insets.left + insets.right;
 71       int height = minHeight + insets.top + insets.bottom;
 72       return new Dimension(width, height);
 73    
 74 
 75    public void layoutContainer(Container parent)
 76    
 77       setSizes(parent);
 78 
 79       // compute center of the circle
 80 
 81       Insets insets = parent.getInsets();
 82       int containerWidth = parent.getSize().width - insets.left - insets.right;
 83       int containerHeight = parent.getSize().height - insets.top - insets.bottom;
 84 
 85       int xcenter = insets.left + containerWidth / 2;
 86       int ycenter = insets.top + containerHeight / 2;
 87 
 88       // compute radius of the circle
 89 
 90       int xradius = (containerWidth - maxComponentWidth) / 2;
 91       int yradius = (containerHeight - maxComponentHeight) / 2;
 92       int radius = Math.min(xradius, yradius);
 93 
 94       // lay out components along the circle
 95 
 96       int n = parent.getComponentCount();
 97       for (int i = 0; i < n; i++)
 98       
 99          Component c = parent.getComponent(i);
100          if (c.isVisible())
101          
102             double angle = 2 * Math.PI * i / n;
103 
104             // center point of component
105             int x = xcenter + (int) (Math.cos(angle) * radius);
106             int y = ycenter + (int) (Math.sin(angle) * radius);
107 
108             // move component so that its center is (x, y)
109             // and its size is its preferred size
110             Dimension d = c.getPreferredSize();
111             c.setBounds(x - d.width / 2, y - d.height / 2, d.width, d.height);
112          
113       
114    
115 

 1 package circleLayout;
 2 
 3 import javax.swing.*;
 4 
 5 /**
 6  * A frame that shows buttons arranged along a circle.
 7  */
 8 public class CircleLayoutFrame extends JFrame
 9 
10    public CircleLayoutFrame()
11    
12       setLayout(new CircleLayout());
13       add(new JButton("Yellow"));
14       add(new JButton("Blue"));
15       add(new JButton("Red"));
16       add(new JButton("Green"));
17       add(new JButton("Orange"));
18       add(new JButton("Fuchsia"));
19       add(new JButton("Indigo"));
20       pack();
21    
22 

 1 package circleLayout;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.33 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class CircleLayoutTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new CircleLayoutFrame();
16          frame.setTitle("CircleLayoutTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package dialog;
 2 
 3 import java.awt.BorderLayout;
 4 
 5 import javax.swing.JButton;
 6 import javax.swing.JDialog;
 7 import javax.swing.JFrame;
 8 import javax.swing.JLabel;
 9 import javax.swing.JPanel;
10 
11 /**
12  * A sample modal dialog that displays a message and waits for the user to click the OK button.
13  */
14 public class AboutDialog extends JDialog
15 
16    public AboutDialog(JFrame owner)
17    
18       super(owner, "About DialogTest", true);
19 
20       // add HTML label to center
21 
22       add(
23             new JLabel(
24                   "<html><h1><i>Core Java</i></h1><hr>By Cay Horstmann</html>"),
25             BorderLayout.CENTER);
26 
27       // OK button closes the dialog
28 
29       JButton ok = new JButton("OK");
30       ok.addActionListener(event -> setVisible(false));
31 
32       // add OK button to southern border
33 
34       JPanel panel = new JPanel();
35       panel.add(ok);
36       add(panel, BorderLayout.SOUTH);
37 
38       pack();
39    
40 

 1 package dialog;
 2 
 3 import javax.swing.JFrame;
 4 import javax.swing.JMenu;
 5 import javax.swing.JMenuBar;
 6 import javax.swing.JMenuItem;
 7 
 8 /**
 9  * A frame with a menu whose File->About action shows a dialog.
10  */
11 public class DialogFrame extends JFrame
12 
13    private static final int DEFAULT_WIDTH = 300;
14    private static final int DEFAULT_HEIGHT = 200;
15    private AboutDialog dialog;
16 
17    public DialogFrame()
18    
19       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
20 
21       // Construct a File menu.
22 
23       JMenuBar menuBar = new JMenuBar();
24       setJMenuBar(menuBar);
25       JMenu fileMenu = new JMenu("File");
26       menuBar.add(fileMenu);
27 
28       // Add About and Exit menu items.
29 
30       // The About item shows the About dialog.
31 
32       JMenuItem aboutItem = new JMenuItem("About");
33       aboutItem.addActionListener(event -> 
34          if (dialog == null) // first time
35             dialog = new AboutDialog(DialogFrame.this);
36          dialog.setVisible(true); // pop up dialog
37       );
38       fileMenu.add(aboutItem);
39 
40       // The Exit item exits the program.
41 
42       JMenuItem exitItem = new JMenuItem("Exit");
43       exitItem.addActionListener(event -> System.exit(0));
44       fileMenu.add(exitItem);
45    
46 

 1 package dialog;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2012-06-12
 8  * @author Cay Horstmann
 9  */
10 public class DialogTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new DialogFrame();
16          frame.setTitle("DialogTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package dataExchange;
 2 
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * A frame with a menu whose File->Connect action shows a password dialog.
 9  */
10 public class DataExchangeFrame extends JFrame
11 
12    public static final int TEXT_ROWS = 20;
13    public static final int TEXT_COLUMNS = 40;
14    private PasswordChooser dialog = null;
15    private JTextArea textArea;
16 
17    public DataExchangeFrame()
18    
19       // construct a File menu
20 
21       JMenuBar mbar = new JMenuBar();
22       setJMenuBar(mbar);
23       JMenu fileMenu = new JMenu("File");
24       mbar.add(fileMenu);
25 
26       // add Connect and Exit menu items
27 
28       JMenuItem connectItem = new JMenuItem("Connect");
29       connectItem.addActionListener(new ConnectAction());
30       fileMenu.add(connectItem);
31 
32       // The Exit item exits the program
33 
34       JMenuItem exitItem = new JMenuItem("Exit");
35       exitItem.addActionListener(event -> System.exit(0));
36       fileMenu.add(exitItem);
37 
38       textArea = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
39       add(new JScrollPane(textArea), BorderLayout.CENTER);
40       pack();
41    
42 
43    /**
44     * The Connect action pops up the password dialog.
45     */
46    private class ConnectAction implements ActionListener
47    
48       public void actionPerformed(ActionEvent event)
49       
50          // if first time, construct dialog
51 
52          if (dialog == null) dialog = new PasswordChooser();
53 
54          // set default values
55          dialog.setUser(new User("yourname", null));
56 
57          // pop up dialog
58          if (dialog.showDialog(DataExchangeFrame.this, "Connect"))
59          
60             // if accepted, retrieve user input
61             User u = dialog.getUser();
62             textArea.append("user name = " + u.getName() + ", password = "
63                   + (new String(u.getPassword())) + "
");
64          
65       
66    
67 

 1 package dataExchange;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class DataExchangeTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new DataExchangeFrame();
16          frame.setTitle("DataExchangeTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

  1 package dataExchange;
  2 
  3 import java.awt.BorderLayout;
  4 import java.awt.Component;
  5 import java.awt.Frame;
  6 import java.awt.GridLayout;
  7 
  8 import javax.swing.JButton;
  9 import javax.swing.JDialog;
 10 import javax.swing.JLabel;
 11 import javax.swing.JPanel;
 12 import javax.swing.JPasswordField;
 13 import javax.swing.JTextField;
 14 import javax.swing.SwingUtilities;
 15 
 16 /**
 17  * A password chooser that is shown inside a dialog
 18  */
 19 public class PasswordChooser extends JPanel
 20 
 21    private JTextField username;
 22    private JPasswordField password;
 23    private JButton okButton;
 24    private boolean ok;
 25    private JDialog dialog;
 26 
 27    public PasswordChooser()
 28    
 29       setLayout(new BorderLayout());
 30 
 31       // construct a panel with user name and password fields
 32 
 33       JPanel panel = new JPanel();
 34       panel.setLayout(new GridLayout(2, 2));
 35       panel.add(new JLabel("User name:"));
 36       panel.add(username = new JTextField(""));
 37       panel.add(new JLabel("Password:"));
 38       panel.add(password = new JPasswordField(""));
 39       add(panel, BorderLayout.CENTER);
 40 
 41       // create Ok and Cancel buttons that terminate the dialog
 42 
 43       okButton = new JButton("Ok");
 44       okButton.addActionListener(event -> 
 45          ok = true;
 46          dialog.setVisible(false);
 47       );
 48 
 49       JButton cancelButton = new JButton("Cancel");
 50       cancelButton.addActionListener(event -> dialog.setVisible(false));
 51 
 52       // add buttons to southern border
 53 
 54       JPanel buttonPanel = new JPanel();
 55       buttonPanel.add(okButton);
 56       buttonPanel.add(cancelButton);
 57       add(buttonPanel, BorderLayout.SOUTH);
 58    
 59 
 60    /**
 61     * Sets the dialog defaults.
 62     * @param u the default user information
 63     */
 64    public void setUser(User u)
 65    
 66       username.setText(u.getName());
 67    
 68 
 69    /**
 70     * Gets the dialog entries.
 71     * @return a User object whose state represents the dialog entries
 72     */
 73    public User getUser()
 74    
 75       return new User(username.getText(), password.getPassword());
 76    
 77 
 78    /**
 79     * Show the chooser panel in a dialog
 80     * @param parent a component in the owner frame or null
 81     * @param title the dialog window title
 82     */
 83    public boolean showDialog(Component parent, String title)
 84    
 85       ok = false;
 86 
 87       // locate the owner frame
 88 
 89       Frame owner = null;
 90       if (parent instanceof Frame)
 91          owner = (Frame) parent;
 92       else
 93          owner = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, parent);
 94 
 95       // if first time, or if owner has changed, make new dialog
 96 
 97       if (dialog == null || dialog.getOwner() != owner)
 98       
 99          dialog = new JDialog(owner, true);
100          dialog.add(this);
101          dialog.getRootPane().setDefaultButton(okButton);
102          dialog.pack();
103       
104 
105       // set title and show dialog
106 
107       dialog.setTitle(title);
108       dialog.setVisible(true);
109       return ok;
110    
111 

 1 package dataExchange;
 2 
 3 /**
 4  * A user has a name and password. For security reasons, the password is stored as a char[], not a
 5  * String.
 6  */
 7 public class User
 8 
 9    private String name;
10    private char[] password;
11 
12    public User(String aName, char[] aPassword)
13    
14       name = aName;
15       password = aPassword;
16    
17 
18    public String getName()
19    
20       return name;
21    
22 
23    public char[] getPassword()
24    
25       return password;
26    
27 
28    public void setName(String aName)
29    
30       name = aName;
31    
32 
33    public void setPassword(char[] aPassword)
34    
35       password = aPassword;
36    
37 

 1 package fileChooser;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.25 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class FileChooserTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new ImageViewerFrame();
16          frame.setTitle("FileChooserTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

 1 package fileChooser;
 2 
 3 import java.io.*;
 4 import javax.swing.*;
 5 import javax.swing.filechooser.*;
 6 import javax.swing.filechooser.FileFilter;
 7 
 8 /**
 9  * A file view that displays an icon for all files that match a file filter.
10  */
11 public class FileIconView extends FileView
12 
13    private FileFilter filter;
14    private Icon icon;
15 
16    /**
17     * Constructs a FileIconView.
18     * @param aFilter a file filter--all files that this filter accepts will be shown 
19     * with the icon.
20     * @param anIcon--the icon shown with all accepted files.
21     */
22    public FileIconView(FileFilter aFilter, Icon anIcon)
23    
24       filter = aFilter;
25       icon = anIcon;
26    
27 
28    public Icon getIcon(File f)
29    
30       if (!f.isDirectory() && filter.accept(f)) return icon;
31       else return null;
32    
33 

 1 package fileChooser;
 2 
 3 import java.awt.*;
 4 import java.io.*;
 5 
 6 import javax.swing.*;
 7 
 8 /**
 9  * A file chooser accessory that previews images.
10  */
11 public class ImagePreviewer extends JLabel
12 
13    /**
14     * Constructs an ImagePreviewer.
15     * @param chooser the file chooser whose property changes trigger an image
16     *        change in this previewer
17     */
18    public ImagePreviewer(JFileChooser chooser)
19    
20       setPreferredSize(new Dimension(100, 100));
21       setBorder(BorderFactory.createEtchedBorder());
22 
23       chooser.addPropertyChangeListener(event -> 
24          if (event.getPropertyName() == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)
25          
26             // the user has selected a new file
27             File f = (File) event.getNewValue();
28             if (f == null)
29             
30                setIcon(null);
31                return;
32             
33 
34             // read the image into an icon
35             ImageIcon icon = new ImageIcon(f.getPath());
36 
37             // if the icon is too large to fit, scale it
38             if (icon.getIconWidth() > getWidth())
39                icon = new ImageIcon(icon.getImage().getScaledInstance(
40                      getWidth(), -1, Image.SCALE_DEFAULT));
41 
42             setIcon(icon);
43          
44       );
45    
46 

 1 package fileChooser;
 2 
 3 import java.io.*;
 4 
 5 import javax.swing.*;
 6 import javax.swing.filechooser.*;
 7 import javax.swing.filechooser.FileFilter;
 8 
 9 /**
10  * A frame that has a menu for loading an image and a display area for the
11  * loaded image.
12  */
13 public class ImageViewerFrame extends JFrame
14 
15    private static final int DEFAULT_WIDTH = 300;
16    private static final int DEFAULT_HEIGHT = 400;
17    private JLabel label;
18    private JFileChooser chooser;
19 
20    public ImageViewerFrame()
21    
22       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
23 
24       // set up menu bar
25       JMenuBar menuBar = new JMenuBar();
26       setJMenuBar(menuBar);
27 
28       JMenu menu = new JMenu("File");
29       menuBar.add(menu);
30 
31       JMenuItem openItem = new JMenuItem("Open");
32       menu.add(openItem);
33       openItem.addActionListener(event -> 
34          chooser.setCurrentDirectory(new File("."));
35 
36          // show file chooser dialog
37             int result = chooser.showOpenDialog(ImageViewerFrame.this);
38 
39             // if image file accepted, set it as icon of the label
40             if (result == JFileChooser.APPROVE_OPTION)
41             
42                String name = chooser.getSelectedFile().getPath();
43                label.setIcon(new ImageIcon(name));
44                pack();
45             
46          );
47 
48       JMenuItem exitItem = new JMenuItem("Exit");
49       menu.add(exitItem);
50       exitItem.addActionListener(event -> System.exit(0));
51 
52       // use a label to display the images
53       label = new JLabel();
54       add(label);
55 
56       // set up file chooser
57       chooser = new JFileChooser();
58 
59       // accept all image files ending with .jpg, .jpeg, .gif
60       FileFilter filter = new FileNameExtensionFilter(
61             "Image files", "jpg", "jpeg", "gif");
62       chooser.setFileFilter(filter);
63 
64       chooser.setAccessory(new ImagePreviewer(chooser));
65 
66       chooser.setFileView(new FileIconView(filter, new ImageIcon("palette.gif")));
67    
68 

 1 package colorChooser;
 2 
 3 import javax.swing.*;
 4 
 5 /**
 6  * A frame with a color chooser panel
 7  */
 8 public class ColorChooserFrame extends JFrame
 9 
10    private static final int DEFAULT_WIDTH = 300;
11    private static final int DEFAULT_HEIGHT = 200;
12 
13    public ColorChooserFrame()
14          
15       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
16 
17       // 添加颜色选择器面板到框架
18 
19       ColorChooserPanel panel = new ColorChooserPanel();
20       add(panel);
21    
22 

 1 package colorChooser;
 2 
 3 import java.awt.Color;
 4 import java.awt.Frame;
 5 import java.awt.event.ActionEvent;
 6 import java.awt.event.ActionListener;
 7 
 8 import javax.swing.JButton;
 9 import javax.swing.JColorChooser;
10 import javax.swing.JDialog;
11 import javax.swing.JPanel;
12 
13 /**
14  * A panel with buttons to pop up three types of color choosers
15  */
16 public class ColorChooserPanel extends JPanel
17 
18    public ColorChooserPanel()
19    
20       JButton modalButton = new JButton("Modal");
21       modalButton.addActionListener(new ModalListener());
22       add(modalButton);
23 
24       JButton modelessButton = new JButton("Modeless");
25       modelessButton.addActionListener(new ModelessListener());
26       add(modelessButton);
27 
28       JButton immediateButton = new JButton("Immediate");
29       immediateButton.addActionListener(new ImmediateListener());
30       add(immediateButton);
31    
32 
33    /**
34     * This listener pops up a modal color chooser
35     */
36    private class ModalListener implements ActionListener
37    
38       public void actionPerformed(ActionEvent event)
39       
40          Color defaultColor = getBackground();
41          Color selected = JColorChooser.showDialog(ColorChooserPanel.this, "Set background",
42                defaultColor);
43          if (selected != null) setBackground(selected);
44       
45    
46 
47    /**
48     * This listener pops up a modeless color chooser. The panel color is changed when the user
49     * clicks the OK button.
50     */
51    private class ModelessListener implements ActionListener
52    
53       private JDialog dialog;
54       private JColorChooser chooser;
55 
56       public ModelessListener()
57       
58          chooser = new JColorChooser();
59          dialog = JColorChooser.createDialog(ColorChooserPanel.this, "Background Color",
60                false /* not modal */, chooser, 
61                event -> setBackground(chooser.getColor()), 
62                null /* no Cancel button listener */);
63       
64 
65       public void actionPerformed(ActionEvent event)
66       
67          chooser.setColor(getBackground());
68          dialog.setVisible(true);
69       
70    
71 
72    /**
73     * This listener pops up a modeless color chooser. The panel color is changed immediately when
74     * the user picks a new color.
75     */
76    private class ImmediateListener implements ActionListener
77    
78       private JDialog dialog;
79       private JColorChooser chooser;
80 
81       public ImmediateListener()
82       
83          chooser = new JColorChooser();
84          chooser.getSelectionModel().addChangeListener(
85                event -> setBackground(chooser.getColor()));
86 
87          dialog = new JDialog((Frame) null, false /* not modal */);
88          dialog.add(chooser);
89          dialog.pack();
90       
91 
92       public void actionPerformed(ActionEvent event)
93       
94          chooser.setColor(getBackground());
95          dialog.setVisible(true);
96       
97    
98 

 1 package colorChooser;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.04 2015-06-12
 8  * @author Cay Horstmann
 9  */
10 public class ColorChooserTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new ColorChooserFrame();
16          frame.setTitle("ColorChooserTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21