201771010111李瑞红《第十二周学习总结》(代码片段)

 1 package First;
 2 
 3 import javax.swing.*;
 4 public class SimpleFrameTest1
 5 
 6    public static void main(String[] args)
 7    
 8      JFrame  frame = new JFrame(); 
 9      frame.setBounds(0, 0,300, 200);//设置窗口的位置（0，0）以及大小（宽高）；
10      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置默认的关闭操作；
11      frame.setVisible(true); //boolean设置窗口是否可见；   
12    
13 

 1 package t;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.33 2015-05-12
 8  * @author Cay Horstmann
 9  */
10 public class SimpleFrameTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() ->
15          
16             SimpleFrame frame = new SimpleFrame();
17             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置默认的关闭操作；
18             frame.setVisible(true);//设置窗口是否可见；
19          );
20    
21 
22 
23 class SimpleFrame extends JFrame//父类JFrame
24 
25    private static final int DEFAULT_WIDTH = 300;//静态私有属性宽；
26    private static final int DEFAULT_HEIGHT = 200;//静态私有属性高；
27 
28    public SimpleFrame()//构造器
29    
30       setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
31    
32 

1 package sizedFrame;
 2 
 3 import java.awt.*;
 4 import javax.swing.*;
 5 
 6 /**
 7  * @version 1.34 2015-06-16
 8  * @author Cay Horstmann
 9  */
10 public class SizedFrameTest
11 
12    public static void main(String[] args)
13    
14       EventQueue.invokeLater(() ->
15          
16             JFrame frame = new SizedFrame();//生成类对象
17             frame.setTitle("SizedFrame");
18             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
19             frame.setVisible(true);
20          );
21    
22 
23 
24 class SizedFrame extends JFrame
25 
26    public SizedFrame()
27    
28       // 获取屏幕尺寸
29 
30       Toolkit kit = Toolkit.getDefaultToolkit();
31       Dimension screenSize = kit.getScreenSize();
32       int screenHeight = screenSize.height;
33       int screenWidth = screenSize.width;
34 
35       // 设置框架宽度、高度并让平台选择屏幕位置
36 
37       setSize(screenWidth / 2, screenHeight / 2);
38       setLocationByPlatform(true);
39 
40       // 设置帧图标
41 
42       Image img = new ImageIcon("icon.gif").getImage();
43       setIconImage(img);      
44    
45 

package notHelloWorld;

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

/**
 * @version 1.33 2015-05-12
 * @author Cay Horstmann
 */
public class NotHelloWorld

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new NotHelloWorldFrame();
            frame.setTitle("NotHelloWorld");//为框架设置名字
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);//设置框架的可见性
         );
   


/**
 * A frame that contains a message panel
 */
class NotHelloWorldFrame extends JFrame

   public NotHelloWorldFrame()
   
      add(new NotHelloWorldComponent());//调用add方法
      pack();
   


/**
 * A component that displays a message.
 */
class NotHelloWorldComponent extends JComponent

   public static final int MESSAGE_X = 75;
   public static final int MESSAGE_Y = 100;//定义两个静态常量

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;//设置所要画的图在窗口中的位置

   public void paintComponent(Graphics g)
   
      g.drawString("Not a Hello, World program", MESSAGE_X, MESSAGE_Y);//文字helloworld是画上去的并非是一个文字形式。
   
   
   public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); 

 1 package draw;
 2 
 3 import java.awt.*;
 4 import java.awt.geom.*;
 5 import javax.swing.*;
 6 
 7 /**
 8  * @version 1.33 2007-05-12
 9  * @author Cay Horstmann
10  */
11 public class DrawTest
12 
13    public static void main(String[] args)
14    
15       EventQueue.invokeLater(() ->
16          
17             JFrame frame = new DrawFrame();//生成类对象
18             frame.setTitle("DrawTest");//为这个框架命名
19             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
20             frame.setVisible(true);//设置框架的可见性
21          );
22    
23 
24 
25 /**
26  * A frame that contains a panel with drawings
27  */
28 class DrawFrame extends JFrame
29 
30    public DrawFrame()
31          
32       add(new DrawComponent());
33       pack();
34    
35 
36 
37 /**
38  * A component that displays rectangles and ellipses.
39  */
40 class DrawComponent extends JComponent
41 
42    private static final int DEFAULT_WIDTH = 400;
43    private static final int DEFAULT_HEIGHT = 400;
44 
45    public void paintComponent(Graphics g)
46    
47       Graphics2D g2 = (Graphics2D) g;
48 
49       // 画一个矩形
50 
51       double leftX = 100;
52       double topY = 100;
53       double width = 200;
54       double height = 150;
55 
56       Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);
57       g2.draw(rect);
58 
59       // 在矩形内画椭圆
60 
61       Ellipse2D ellipse = new Ellipse2D.Double();
62       ellipse.setFrame(rect);
63       g2.draw(ellipse);
64 
65       // 画一条对角线
66 
67       g2.draw(new Line2D.Double(leftX, topY, leftX + width, topY + height));
68 
69       // 用同一个中心画一个圆
70 
71       double centerX = rect.getCenterX();
72       double centerY = rect.getCenterY();
73       double radius = 150;
74 
75       Ellipse2D circle = new Ellipse2D.Double();
76       circle.setFrameFromCenter(centerX, centerY, centerX + radius, centerY + radius);
77       g2.draw(circle);
78    
79    
80    public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); 
81 

 1 package font;
 2 
 3 import java.awt.*;
 4 import java.awt.font.*;
 5 import java.awt.geom.*;
 6 import javax.swing.*;
 7 
 8 /**
 9  * @version 1.34 2015-05-12
10  * @author Cay Horstmann
11  */
12 public class FontTest
13 
14    public static void main(String[] args)
15    
16       EventQueue.invokeLater(() ->
17          
18             JFrame frame = new FontFrame();//生成类对象
19             frame.setTitle("FontTest");//为框架设置一个名字
20             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
21             frame.setVisible(true)；//设置框架的可见性
22          );
23    
24 
25 
26 /**
27  * A frame with a text message component
28  */
29 class FontFrame extends JFrame//类的继承
30 
31    public FontFrame()
32          
33       add(new FontComponent());//调用add方法
34       pack();
35    
36 
37 
38 /**
39  * A component that shows a centered message in a box.
40  */
41 class FontComponent extends JComponent
42 
43    private static final int DEFAULT_WIDTH = 300;
44    private static final int DEFAULT_HEIGHT = 200;//定义两个常量
45 
46    public void paintComponent(Graphics g)
47    
48       Graphics2D g2 = (Graphics2D) g;
49 
50       String message = "Hello, World!";
51 
52       Font f = new Font("Serif", Font.BOLD, 36);
53       g2.setFont(f);
54 
55       // 测量消息的大小
56 
57       FontRenderContext context = g2.getFontRenderContext();
58       Rectangle2D bounds = f.getStringBounds(message, context);
59 
60       // 设置（x，y）=文本左上角
61 
62       double x = (getWidth() - bounds.getWidth()) / 2;
63       double y = (getHeight() - bounds.getHeight()) / 2;
64 
65       // 增加到Y到达基线
66 
67       double ascent = -bounds.getY();
68       double baseY = y + ascent;
69 
70       // 汲取信息
71 
72       g2.drawString(message, (int) x, (int) baseY);
73 
74       g2.setPaint(Color.LIGHT_GRAY);
75 
76       // 绘制基线
77 
78       g2.draw(new Line2D.Double(x, baseY, x + bounds.getWidth(), baseY));
79 
80       // 绘制封闭矩形
81 
82       Rectangle2D rect = new Rectangle2D.Double(x, y, bounds.getWidth(), bounds.getHeight());
83       g2.draw(rect);
84    
85    
86    public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); 
87 

package image;

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

/**
 * @version 1.34 2015-05-12
 * @author Cay Horstmann
 */
public class ImageTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new ImageFrame();//生成类对象
            frame.setTitle("ImageTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);//设置框架是可见的
         );
   


/**
 * A frame with an image component
 */
class ImageFrame extends JFrame//类的继承

   public ImageFrame()
   
      add(new ImageComponent());//调用add方法
      pack();
   


/**
 * A component that displays a tiled image
 */
class ImageComponent extends JComponent

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;//设置两个私有属性，宽和高

   private Image image;

   public ImageComponent()
   
      image = new ImageIcon("blue-ball.gif").getImage();//只有在根目录下放置名为blue-ball，格式为GIF的图片时，关闭按钮才起到作用，并能关闭。
   

   public void paintComponent(Graphics g)
   
      if (image == null) return;

      int imageWidth = image.getWidth(null);
      int imageHeight = image.getHeight(null);

      // 把图绘在左上角
      g.drawImage(image, 0, 0, null);
      // 利用组件给其命名

      for (int i = 0; i * imageWidth <= getWidth(); i++)
         for (int j = 0; j * imageHeight <= getHeight(); j++)
            if (i + j > 0) 
               g.copyArea(0, 0, imageWidth, imageHeight, i * imageWidth, j * imageHeight);
   
   
   public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); //返回两个私有属性