201871010123-吴丽丽 《面向对象程序设计（Java）》第十六周学习总结

Lefthand left=new Lefthand(); 
Righthand right=new Righthand(); 

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 long serialVersionUID = 1L;
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");  //在getclass方法的getResourse下查找about.gif文件
      System.out.println(aboutURL);
      Image img = new ImageIcon(aboutURL).getImage();//利用about.gif图像文件制作图标
      setIconImage(img);

      JTextArea textArea = new JTextArea();//创建一个textArea对象
      InputStream stream = getClass().getResourceAsStream("about.txt");//读取about.txt文件
      try (Scanner in = new Scanner(stream, "UTF-8"))
      {
         while (in.hasNext())
             textArea.append(in.nextLine() + "\n");
      }
      add(textArea);
   }
}

class Lefthand implements Runnable{             //用Runnable（）接口实现线程
   public void run()
   {
      
       for(int i=0;i<=5;i++)
       {  System.out.println("You are Students!");
           try{ Thread.sleep(500);   }    //调用了Thread类的start方法
           catch(InterruptedException e)
           { System.out.println("Lefthand error.");}    
       } 
  } 
}
class Righthand implements Runnable {
    public void run()
    {
        
          for(int i=0;i<=5;i++)
         {   System.out.println("I am a Teacher!");
             try{  Thread.sleep(300);  }
             catch(InterruptedException e)
             { System.out.println("Righthand error.");}
         }
    }
}
public class Thread1
{
     static Lefthand left;
     static Righthand right;
     public static void main(String[] args)
     {      //创建Runnable类型的对象，以此类对象为参数建立Thread类的对象
           Runnable lefthand = new Lefthand();    
           Thread left=new Thread(lefthand);    
            left.start();              //调用left这个对象变量的start方法
            Runnable righthand = new Righthand();
            Thread right=new Thread(righthand);
              right.start();  
     }
}

package bounce;

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

/**
 * 显示一个动态弹跳球。
 * @version 1.34 2015-06-21
 * @author Cay Horstmann
 */
public class Bounce
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new BounceFrame();
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

/**
 * 带有球组件和按钮的框架。
 */
class BounceFrame extends JFrame
{
   private BallComponent comp;
   public static final int STEPS = 1000;
   public static final int DELAY = 3;

   /**
    * 使用组件构造框架，以显示弹跳球和开始和关闭按钮
    */
   public BounceFrame()
   {
      setTitle("Bounce");
      comp = new BallComponent();    //创建一个新的BallComponent类赋给comp
      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();
   }

   /**
    * 将按钮添加到容器中。
    * @param c容器
    * @param 按钮标题
    * @param 侦听器按钮的操作侦听器
    */
   public void addButton(Container c, String title, ActionListener listener)
   {
      JButton button = new JButton(title);
      c.add(button);
      button.addActionListener(listener);
   }

   /**
    * 向面板中添加一个弹跳球，使其弹跳1000次。
    */
   public void addBall()
   {
      try
      {
         Ball ball = new Ball();
         comp.add(ball);

         for (int i = 1; i <= STEPS; i++)
         {
            ball.move(comp.getBounds());      //调用ball这对象变量来移动球
            comp.paint(comp.getGraphics());   //调用comp的paint方法来绘画
            Thread.sleep(DELAY);       //调用Thread类的sleep方法
         }
      }
      catch (InterruptedException e)
      {
      }
   }
}

package bounce;

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

/**
 * 画球的部件。
 * @version 1.34 2012-01-26
 * @author Cay Horstmann
 */
public class BallComponent extends JPanel
{
   private static final int DEFAULT_WIDTH = 450;
   private static final int DEFAULT_HEIGHT = 350;

   private java.util.List<Ball> balls = new ArrayList<>();

   /**
    * 向组件添加一个球。
    * 要添加的球
    */
   public void add(Ball b)
   {
      balls.add(b);
   }

   public void paintComponent(Graphics g)
   {
      super.paintComponent(g); // 擦除背景
      Graphics2D g2 = (Graphics2D) g;
      for (Ball b : balls)   //foreach循环
      {
         g2.fill(b.getShape());   //通过对象变量b的getShape方法来传参给fill
      }
   }
   
   public Dimension getPreferredSize() { return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); }     //通过返回一个新建Dimension类来获取组件的大小
}

package bounce;

import java.awt.geom.*;

/**
 * 从长方形边缘上移动和弹跳的球
 * @version 1.33 2007-05-17
 * @author Cay Horstmann
 */
public class Ball
{
   private static final int XSIZE = 15;
   private static final int YSIZE = 15;
   private double x = 0;
   private double y = 0;
   private double dx = 1;
   private double dy = 1;

   /**
    * 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
    */
   public void move(Rectangle2D bounds)
   {
      x += dx;
      y += dy;
      if (x < bounds.getMinX())  //通过bounds来获得宽度的最小值
      {
         x = bounds.getMinX();
         dx = -dx;
      }
      if (x + XSIZE >= bounds.getMaxX())    //通过bounds来获得宽度的最大值
      {
         x = bounds.getMaxX() - XSIZE;
         dx = -dx;
      }
      if (y < bounds.getMinY())    //通过bounds来获得高度的最小值
      {
         y = bounds.getMinY();
         dy = -dy;
      }
      if (y + YSIZE >= bounds.getMaxY())   //通过bounds来获得高度的最大值 
      {
         y = bounds.getMaxY() - YSIZE;
         dy = -dy;
      }
   }

   /**
    * 获取球在当前位置的形状。
    */
   public Ellipse2D getShape()
   {
      return new Ellipse2D.Double(x, y, XSIZE, YSIZE);      //用Ellipse2D类绘制圆作为返回值
   }
}

package bounceThread;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

/**
 * 显示动画弹跳球。
 * @version 1.34 2015-06-21
 * @author Cay Horstmann
 */
public class BounceThread
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new BounceFrame();    //创建一个新框架
         frame.setTitle("BounceThread");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

/**
 *带有面板和按钮的框架。
 */
class BounceFrame extends JFrame
{
   private BallComponent comp;
   public static final int STEPS = 1000;
   public static final int DELAY = 5;


   /**
    * 用显示弹跳球和的组件构造框架启动和关闭按钮
    */
   public BounceFrame()
   {
      comp = new BallComponent();
      add(comp, BorderLayout.CENTER);     //将comp添加到边框布局的中间
      JPanel buttonPanel = new JPanel();
      addButton(buttonPanel, "Start", event -> addBall());
      addButton(buttonPanel, "Close", event -> System.exit(0));
      add(buttonPanel, BorderLayout.SOUTH);
      pack();
   }

   /**
    * 将按钮添加到容器中。
    * @param c容器
    * @param 按钮标题
    * @param 侦听器按钮的操作侦听器
    */
   public void addButton(Container c, String title, ActionListener listener)
   {
      JButton button = new JButton(title);
      c.add(button);
      button.addActionListener(listener);
   }

   /**
    *在画布上添加一个弹跳球，并启动一根线使其弹跳
    */
   public void addBall()
   {
      Ball ball = new Ball();
      comp.add(ball);       //向comp中添加球
      Runnable r = () -> {       //Runnable是函数式接口，用lambda表达式
         try
         {  
            for (int i = 1; i <= STEPS; i++)
            {
               ball.move(comp.getBounds());   //将comp的getBounds方法作为参数来传递ball的move方法
               comp.repaint();           //通过对象来调用repaint方法，repaint方法是在另外一个绘制线程里进行的
               Thread.sleep(DELAY);   //通过Thread线程来调用sleep方法
            }
         }
         catch (InterruptedException e)
         {
         }
      };
      Thread t = new Thread(r);    //创建一新的线程
      t.start();    //调用start方法来启动线程
   }
}