201771010137赵栋《面向对象程序设计（java）》第十三周学习总结(代码片段)

1 package Second;
 2 
 3 import javax.swing.JButton;
 4 import javax.swing.JFrame;
 5 import javax.swing.JPanel;
 6 import javax.swing.SwingUtilities;
 7 import javax.swing.UIManager;
 8 
 9 /**
10  * A frame with a button panel for changing look-and-feel
11  */
12 public class PlafFrame extends JFrame
13 
14    private JPanel buttonPanel;
15 
16    public PlafFrame()
17    
18       buttonPanel = new JPanel();
19       //获取所有安装的观感实现
20 
21       UIManager.LookAndFeelInfo[] infos = UIManager.getInstalledLookAndFeels();
22       for (UIManager.LookAndFeelInfo info : infos)
23          makeButton(info.getName(), info.getClassName());
24 
25       add(buttonPanel);
26       pack();
27    
28 
29    /**
30     * Makes a button to change the pluggable look-and-feel.
31     * @param name the button name
32     * @param className the name of the look-and-feel class
33     */
34    private void makeButton(String name, String className)
35    
36       // 向面板添加按钮；
37 
38       JButton button = new JButton(name);
39       buttonPanel.add(button);
40 
41       // 设置按钮动作；
42 
43       button.addActionListener(event -> 
44          // 按钮动作：切换到新的外观和感觉
45          try
46          
47             UIManager.setLookAndFeel(className);
48             //调用静态方法，刷新全部的组件集。这里需要向方法提供一个组件，并由此找到其他的所有组件
49             //外部对象的this引用必须将外部类名作为前缀
50 
51             SwingUtilities.updateComponentTreeUI(this);
52             pack();
53          
54          catch (Exception e)
55          
56             e.printStackTrace();
57          
58       );
59    
60 

1 package Third;
 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 ActionTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new ActionFrame();
16          frame.setTitle("ActionTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

1 package Third;
 2 
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * A frame with a panel that demonstrates color change actions.
 9  */
10 public class ActionFrame extends JFrame
11 
12    private JPanel buttonPanel;
13    private static final int DEFAULT_WIDTH = 300;
14    private static final int DEFAULT_HEIGHT = 200;
15 
16    public ActionFrame()
17    
18       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
19 
20       buttonPanel = new JPanel();
21 
22       // define actions
23       Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"),
24             Color.YELLOW);
25       Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
26       Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);
27 
28     //用Action对象构造按钮，把动作和按钮关联起来
29 
30       buttonPanel.add(new JButton(yellowAction));
31       buttonPanel.add(new JButton(blueAction));
32       buttonPanel.add(new JButton(redAction));
33 
34       // add panel to frame
35       add(buttonPanel);
36      
37     //得到顶层组件的WHEN_ANCESTOR_OF_FOCUSED_COMPONENT输入映射
38 
39       // associate the Y, B, and R keys with names
40       InputMap imap = buttonPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
41      //将(按键，动作键)添加到输入映射中
42       imap.put(KeyStroke.getKeyStroke("ctrl Y"), "panel.yellow");
43       imap.put(KeyStroke.getKeyStroke("ctrl B"), "panel.blue");
44       imap.put(KeyStroke.getKeyStroke("ctrl R"), "panel.red");
45 
46       // associate the names with actions、
47       //得到顶层组件的动作映射
48       ActionMap amap = buttonPanel.getActionMap();
49     //将(动作键，动作对象)添加到映射中
50 
51       amap.put("panel.yellow", yellowAction);
52       amap.put("panel.blue", blueAction);
53       amap.put("panel.red", redAction);
54    
55    
56    public class ColorAction extends AbstractAction
57    
58       /**
59        * Constructs a color action.
60        * @param name the name to show on the button
61        * @param icon the icon to display on the button
62        * @param c the background color
63        */
64       public ColorAction(String name, Icon icon, Color c)
65       
66         //存储命令的名称、图标、简要说明和需要的颜色
67          putValue(Action.NAME, name);
68          putValue(Action.SMALL_ICON, icon);
69          putValue(Action.SHORT_DESCRIPTION, "Set panel color to " + name.toLowerCase());//显示在工具提示里
70 
71          putValue("color", c);
72       
73 
74       public void actionPerformed(ActionEvent event)
75       
76          Color c = (Color) getValue("color");
77          buttonPanel.setBackground(c);
78       
79    
80 

 1 package Forth;
 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 MouseTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() -> 
15          JFrame frame = new MouseFrame();
16          frame.setTitle("MouseTest");
17          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
18          frame.setVisible(true);
19       );
20    
21 

1 package Forth;
 2 
 3 import javax.swing.*;
 4 
 5 /**
 6  * A frame containing a panel for testing mouse operations
 7  */
 8 public class MouseFrame extends JFrame
 9 
10    public MouseFrame()
11    
12       add(new MouseComponent());
13       pack();
14    
15 

 1 package Forth;
  2 
  3 import java.awt.*;
  4 import java.awt.event.*;
  5 import java.awt.geom.*;
  6 import java.util.*;
  7 import javax.swing.*;
  8 
  9 /**
 10  * A component with mouse operations for adding and removing squares.
 11  */
 12 public class MouseComponent extends JComponent
 13 
 14    private static final int DEFAULT_WIDTH = 300;
 15    private static final int DEFAULT_HEIGHT = 200;
 16 
 17    private static final int SIDELENGTH = 10;
 18    private ArrayList<Rectangle2D> squares;
 19    private Rectangle2D current; // the square containing the mouse cursor
 20 
 21    public MouseComponent()
 22    
 23       squares = new ArrayList<>();
 24       current = null;
 25 
 26       addMouseListener(new MouseHandler());
 27       addMouseMotionListener(new MouseMotionHandler());
 28    
 29 
 30    public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);    
 31    
 32    public void paintComponent(Graphics g)
 33    
 34       Graphics2D g2 = (Graphics2D) g;
 35 
 36       // draw all squares
 37       for (Rectangle2D r : squares)
 38          g2.draw(r);
 39    
 40 
 41    /**
 42     * Finds the first square containing a point.
 43     * @param p a point
 44     * @return the first square that contains p
 45     */
 46    public Rectangle2D find(Point2D p)
 47    
 48       for (Rectangle2D r : squares)
 49       
 50          if (r.contains(p)) return r;
 51       
 52       return null;
 53    
 54 
 55    /**
 56     * Adds a square to the collection.
 57     * @param p the center of the square
 58     */
 59    public void add(Point2D p)
 60    
 61       double x = p.getX();
 62       double y = p.getY();
 63 
 64       current = new Rectangle2D.Double(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH,
 65             SIDELENGTH);
 66       squares.add(current);
 67       repaint();
 68    
 69 
 70    /**
 71     * Removes a square from the collection.
 72     * @param s the square to remove
 73     */
 74    public void remove(Rectangle2D s)
 75    
 76       if (s == null) return;
 77       if (s == current) current = null;
 78       squares.remove(s);
 79       repaint();
 80    
 81    
 82  //两个独立的接口MouseListener和MouseMotionListener，有利于提高效率。
 83    //当用户移动鼠标时，只关心鼠标点击的监听器就不会被多余的鼠标移动所困扰。
 84    private class MouseHandler extends MouseAdapter
 85    
 86       public void mousePressed(MouseEvent event)
 87       
 88          // add a new square if the cursor isn‘t inside a square
 89         //getPoint方法返回事件源组件左上角的x y坐标
 90           //判断该处是否已经绘制图形
 91          current = find(event.getPoint());
 92          if (current == null) add(event.getPoint());
 93       
 94 
 95       public void mouseClicked(MouseEvent event)
 96       
 97          // remove the current square if double clicked
 98          current = find(event.getPoint());
 99        //双击鼠标，擦除方块
100          if (current != null && event.getClickCount() >= 2) remove(current);
101       
102    
103 
104    private class MouseMotionHandler implements MouseMotionListener
105    
106      //移动鼠标的同时按下鼠标，调用mouseMoved
107       public void mouseMoved(MouseEvent event)
108       
109          // set the mouse cursor to cross hairs if it is inside
110          // a rectangle
111         //光标在一个小方块之上时变成另外一种形状（十字）
112          if (find(event.getPoint()) == null) setCursor(Cursor.getDefaultCursor());
113          else setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
114       
115 
116     //更新光标位置
117       public void mouseDragged(MouseEvent event)
118       
119          if (current != null)
120          
121             int x = event.getX();
122             int y = event.getY();
123            //设置形状坐标和大小
124             // drag the current rectangle to center it at (x, y)
125             current.setFrame(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH, SIDELENGTH);
126             repaint();
127          
128       
129       
130 

 1 package practise1;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 
 7 
 8 
 9 public class RandomName 
10 
11     public static void main(String[] args) 
12         // TODO Auto-generated method stub
13         
14            
15               EventQueue.invokeLater(() -> 
16                  JFrame  A= new ButtonFrame();
17                  A.setTitle("点名器");
18                  A.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
19                  A.setVisible(true);
20               );
21            
22     
23 
24 

  1 package practise1;
  2 
  3 import java.awt.Color;
  4 import java.awt.Container;
  5 import java.awt.event.*;
  6 import java.io.*;
  7 import java.util.*;
  8 import java.util.Timer;
  9 
 10 import javax.swing.*;
 11 
 12 public class ButtonFrame extends JFrame 
 13     private ArrayList arrayList;
 14 
 15 
 16 
 17     
 18     arrayList = new ArrayList<>();
 19     //读文件
 20     File file = new File("H:/List.txt");
 21     FileInputStream fis;
 22     try 
 23         fis = new FileInputStream(file);
 24         InputStreamReader in = new InputStreamReader(fis);
 25         BufferedReader buf = new BufferedReader(in);
 26         String readLine;
 27         while ((readLine = buf.readLine())!=null) 
 28             arrayList.add(readLine);
 29             
 30         
 31      catch (FileNotFoundException e1) 
 32         // TODO Auto-generated catch block
 33         e1.printStackTrace();
 34      catch (IOException e1) 
 35         // TODO Auto-generated catch block
 36         e1.printStackTrace();
 37     
 38     
 39     private JPanel buttonPanel;
 40     private static final int DEFAULT_WIDTH = 500;
 41     private static final int DEFAULT_HEIGHT = 300;
 42     
 43     
 44 
 45     public ButtonFrame() 
 46         setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
 47         buttonPanel = new JPanel();
 48         buttonPanel.setLayout(null);
 49         JLabel jLabel = new JLabel("随机点名器");
 50         JButton jButton = new JButton("开始");
 51         jLabel.setBounds(200, 40, 65, 40);
 52         jButton.setBounds(200, 90, 65, 40);
 53         
 54         
 55         
 56         jButton.addActionListener(new ActionListener() 
 57 
 58             Timer timer;
 59 
 60  
 61 
 62             public void actionPerformed(ActionEvent e) 
 63 
 64                 if (jButton.getText().equals("开始")) 
 65 
 66                     timer = new Timer();;
 67 
 68                     TimerTask timerTask = new TimerTask() 
 69 
 70                         public void run() 
 71 
 72                             jButton.setText("停止");
 73 
 74                             jButton.setBackground(Color.red);
 75 
 76                             jLabel.setText((String) arrayList.get((int) (Math.random() * 43)));
 77 
 78                         
 79 
 80  
 81 
 82                     ;
 83 
 84                     timer.schedule(timerTask, 0, 10);
 85 
 86                 
 87 
 88                 if (jButton.getText().equals("停止")) 
 89 
 90                     timer.cancel();
 91 
 92                     jButton.setText("开始");
 93 
 94                     jButton.setBackground(Color.gray);
 95 
 96                 
 97 
 98             
 99 
100         );
101         
102         
103         
104         
105         buttonPanel.add(jLabel);
106         buttonPanel.add(jButton);
107         add(buttonPanel);
108 
109     
110          
111         
112