201871010101-陈来弟《面向对象程序设计（java）》第十六周学习总结

package resource;
 
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
 
/**
 * @version 1.41 2015-06-12
 * @author Cay Horstmann
 */
public class ResourceTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new ResourceTestFrame();
         frame.setTitle("ResourceTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}
 
/**
 * A frame that loads image and text resources.
 */
class ResourceTestFrame extends JFrame
{
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 300;
 
   public ResourceTestFrame()
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
      URL aboutURL = getClass().getResource("about.gif");//找到指定位置的图像文件，返回一个可以加载资源的URL
      Image img = new ImageIcon(aboutURL).getImage();//将加载的about.gif图像设置为图标
      setIconImage(img);
 
      JTextArea textArea = new JTextArea();
      InputStream stream = getClass().getResourceAsStream("about.txt");//读取about.txt文本文件内容
      try (Scanner in = new Scanner(stream, "UTF-8"))//将读取到的about.txt文本文件里内容显示到文本区
      {
         while (in.hasNext())//读取文本文件
            textArea.append(in.nextLine() + "\n");
      }
      add(textArea);
   }
}

class Lefthand extends Thread { 
   public void run()
   {
       for(int i=0;i<=5;i++)
       {  System.out.println("You are Students!");
           try{   sleep(500);   }
           catch(InterruptedException e)
           { System.out.println("Lefthand error.");}    
       } 
  } 
}
class Righthand extends Thread {
    public void run()
    {
         for(int i=0;i<=5;i++)
         {   System.out.println("I am a Teacher!");
             try{  sleep(300);  }
             catch(InterruptedException e)
             { System.out.println("Righthand error.");}
         }
    }
}
public class ThreadTest 
{
     static Lefthand left;
     static Righthand right;
     public static void main(String[] args)
     {     left=new Lefthand();
           right=new Righthand();
           left.start();
           right.start();
     }
}

 1 package bounce;
 2  
 3 import java.awt.*;
 4 import java.util.*;
 5 import javax.swing.*;
 6  
 7 public class BallComponent extends JPanel
 8 {
 9    private static final int DEFAULT_WIDTH = 450;
10    private static final int DEFAULT_HEIGHT = 350;
11  
12    private java.util.List<Ball> balls = new ArrayList<>();
13  
14  /**  向组件中添加一个球。*/
15    public void add(Ball b)
16    {
17       balls.add(b);
18    }
19  
20    public void paintComponent(Graphics g)
21    {
22       super.paintComponent(g); // 擦除背景
23       Graphics2D g2 = (Graphics2D) g;
24       for (Ball b : balls)
25       {
26          g2.fill(b.getShape());
27       }
28    }
29    
30    public Dimension getPreferredSize() { return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); }
31 }

 1 package bounce;
 2  
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6  
 7 public class Bounce
 8 {
 9    public static void main(String[] args)
10    {
11       EventQueue.invokeLater(() -> {
12          JFrame frame = new BounceFrame();
13          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
14          frame.setVisible(true);
15       });
16    }
17 }
18  /** 带有球组件和按钮的框架。*/
19 class BounceFrame extends JFrame
20 {
21    private BallComponent comp;
22    public static final int STEPS = 1000;
23    public static final int DELAY = 3;
24  
25  /**
26   * 用显示弹跳球和的组件构造框架
27   *启动和关闭按钮
28   **/
29    public BounceFrame()
30    {
31       setTitle("Bounce");
32       comp = new BallComponent();
33       add(comp, BorderLayout.CENTER);
34       JPanel buttonPanel = new JPanel();
35       addButton(buttonPanel, "Start", event -> addBall());
36       addButton(buttonPanel, "Close", event -> System.exit(0));
37       add(buttonPanel, BorderLayout.SOUTH);
38       pack();
39    }
40  
41    /**
42           * 将按钮添加到容器中
43           *按钮标题
44           * 按钮的动作监听器
45    */
46    public void addButton(Container c, String title, ActionListener listener)
47    {
48       JButton button = new JButton(title);
49       c.add(button);
50       button.addActionListener(listener);
51    }
52  
53    /**
54            *向面板中添加一个弹跳球，使其弹跳1000次。
55     */
56    public void addBall()
57    {
58       try
59       {
60          Ball ball = new Ball();
61          comp.add(ball);
62  
63          for (int i = 1; i <= STEPS; i++)
64          {
65             ball.move(comp.getBounds());
66             comp.paint(comp.getGraphics());
67             Thread.sleep(DELAY);
68          }
69       }
70       catch (InterruptedException e)
71       {
72       }
73    }
74 }

 1 package bounce;
 2  
 3 import java.awt.geom.*;
 4  
 5 /**
 6  * 从长方形边缘上移动和弹跳的球
 7  */
 8 public class Ball
 9 {
10    private static final int XSIZE = 15;
11    private static final int YSIZE = 15;
12    private double x = 0;
13    private double y = 0;
14    private double dx = 1;
15    private double dy = 1;
16  
17    /**
18          * 将球移动到下一个位置，如果球碰到其中一条边，则反向移动
19     */
20    public void move(Rectangle2D bounds)
21    {
22       x += dx;
23       y += dy;
24       if (x < bounds.getMinX())
25       {
26          x = bounds.getMinX();
27          dx = -dx;
28       }
29       if (x + XSIZE >= bounds.getMaxX())
30       {
31          x = bounds.getMaxX() - XSIZE;
32          dx = -dx;
33       }
34       if (y < bounds.getMinY())
35       {
36          y = bounds.getMinY();
37          dy = -dy;
38       }
39       if (y + YSIZE >= bounds.getMaxY())
40       {
41          y = bounds.getMaxY() - YSIZE;
42          dy = -dy;
43       }
44    }
45  
46    /**
47         * 获取球在当前位置的形状。
48     */
49    public Ellipse2D getShape()
50    {
51       return new Ellipse2D.Double(x, y, XSIZE, YSIZE);
52    }
53 }

package bounceThread;
 
import java.awt.*;
import java.awt.event.*;
 
import javax.swing.*;
 
public class BounceThread
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new BounceFrame();
         frame.setTitle("BounceThread");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}
 
class BounceFrame extends JFrame
{
   private BallComponent comp;
   public static final int STEPS = 1000;
   public static final int DELAY = 5;
 
 
   public BounceFrame()
   {
      comp = new BallComponent();
      add(comp, BorderLayout.CENTER);
      JPanel buttonPanel = new JPanel();
      addButton(buttonPanel, "Start", event -> addBall());
      addButton(buttonPanel, "Close", event -> System.exit(0));
      add(buttonPanel, BorderLayout.SOUTH);
      pack();
   }
 
 
   public void addButton(Container c, String title, ActionListener listener)
   {
      JButton button = new JButton(title);
      c.add(button);
      button.addActionListener(listener);
   }
 
 
   public void addBall()   /** 在画布上添加一个弹跳球，并启动一个线程使其运行*/
   {
      Ball ball = new Ball();
      comp.add(ball);
      Runnable r = () -> { 
         try
         {  
            for (int i = 1; i <= STEPS; i++)
            {
               ball.move(comp.getBounds());
               comp.repaint();
               Thread.sleep(DELAY);
            }
         }
         catch (InterruptedException e)
         {
         }
      };
      Thread t = new Thread(r);
      t.start();
   }
}