关于线程wait的问题，向各位大侠求救！！！！！

Question

找了半天，也只看到一个button

Answer 1

对不起，发错了。^_^·请原谅。
应为三个按钮，原程序为：
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */public class Frame4 extends JFrame
{
  private JPanel jPanel1 = new JPanel();
  private JToggleButton jToggleButton1 = new JToggleButton();
  private ImagePanel jPanel=new ImagePanel();
  private drawPanel dPanel=new drawPanel();
  private JToggleButton jToggleButton2 = new JToggleButton();
  private Thread t=new Thread(dPanel);
  private Integer dump=new Integer(0);
  private JToggleButton jToggleButton3 = new JToggleButton();
  public Frame4() {
    setSize(800,600);
    setTitle("Thread");
    try {
      jbInit();
      this.addWindowListener(new WindowAdapter()
      {
        public void windowClosing(WindowEvent e)
        {
          if(e.getID()==WindowEvent.WINDOW_CLOSING)
            System.exit(0);
        //System.getProperties();
        }
      });
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    Frame4 frame=new Frame4();
    frame.show();
  }
  private void jbInit() throws Exception {
    jToggleButton1.setText("start");
    jToggleButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jToggleButton1_actionPerformed(e);
      }
    });
    jToggleButton2.setText("suspend");
    jToggleButton2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jToggleButton2_actionPerformed(e);
      }
    });
    jToggleButton3.setText("resume");
    jToggleButton3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jToggleButton3_actionPerformed(e);
      }
    });
    jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseReleased(MouseEvent e) {
        jPanel1_mouseReleased(e);
      }
    });
    this.getContentPane().add(jPanel1, BorderLayout.SOUTH);
    jPanel1.add(jToggleButton1, null);
    jPanel1.add(jToggleButton2, null);
    jPanel1.add(jToggleButton3, null);
    this.getContentPane().add(dPanel, BorderLayout.CENTER);
  }  void jToggleButton1_actionPerformed(ActionEvent e)
  {   // jPanel1.setVisible(false);
     t.start();  }  void jToggleButton2_actionPerformed(ActionEvent e)
  {
    try
     {     dPanel.checkSuspened();
     }
    catch(InterruptedException ev)
     {ev.printStackTrace();}   // t.start();
   // if(!(t.isInterrupted()))
     // System.out.println("ok");
  }  void jToggleButton3_actionPerformed(ActionEvent e) {
    if(t.isAlive())
     {
       dPanel.requestResume();     }  }  void jPanel1_mouseReleased(MouseEvent e) {
  jPanel1.setBackground(new Color(0,250,0));
  }
}
class drawPanel extends JPanel implements Runnable{
   int xCenter=150;
   MyChar[] str = new MyChar[20];
   int yStep = 0;
   boolean suspendRequested=true;
   public drawPanel()
   {
     for(int i=0;i<str.length;i++) {
             str[i] = new MyChar(i,(char)(65+i));
         }
        setPos();   }
   public void run()
   {
     Thread t=Thread.currentThread();
     while(true)
     {
       setPos();
       this.repaint();
       try
       {
         t.sleep(300);
       }
       catch(Exception ev)
       {
        ev.printStackTrace();
       }     }   }
   synchronized void checkSuspened() throws InterruptedException
   {
   while(suspendRequested)
   {
   this.wait();
   }   }
   synchronized void requestResume()
   {
   suspendRequested=false;
   this.notifyAll();   }
   public void paint(Graphics g) {
     super.paint(g);
     g.setColor(Color.white);
     g.fillRect(0,0,400,500);
     g.setColor(Color.blue);
     for(int i=0;i<str.length;i++) {
       str[i].draw(g);
     }
        }
   public void setPos() {
       yStep+=3;
       for(int i=0;i<str.length;i++) {
           str[i].setPosition(300-(20-i*2+yStep));
       }
    }
   class MyChar {
        int x,y;
        char ch;
        int index = 0;
        boolean direct = false;        public MyChar(int index,char ch) {
            this.ch = ch;
            this.index = index;
        }        public void setPosition(int y) {
            if(direct) {
                index++;
                if(index == str.length)
                    direct = false;
            } else {
                index--;
                if(index == 0)
                    direct = true;
            }
            this.x = (int)(Math.cos(((double)((index/10.0f)*Math.PI))) * 40.0f)+xCenter;
            this.y = y;
        }        public void draw(Graphics g) {
            g.drawString(new String(new char[]{ch}),x,y);
        }
    }
}
请指点。谢谢！！

Answer 2

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class graphicFrame  extends JFrame implements Runnable {
    private JPanel contentPane;
    private BorderLayout borderLayout1 = new BorderLayout();
    private JButton jButton1 = new JButton();
    private MyPanel panel1 = new MyPanel();
    Thread myThread = null;
    MyChar[] str = new MyChar[20];
    int yStep = 0;
    int xCenter = 150;
    boolean flag;    //Construct the frame
    public graphicFrame() {
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
        try {
            jbInit();
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
    //Component initialization
    private void jbInit() throws Exception  {
       
        contentPane = (JPanel) this.getContentPane();
        jButton1.setText("开始");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jButton1_actionPerformed(e);
            }
        });
        contentPane.setLayout(borderLayout1);
        this.setSize(new Dimension(400, 423));
        this.setTitle("Frame Title");
        contentPane.add(jButton1, BorderLayout.SOUTH);
        contentPane.add(panel1, BorderLayout.CENTER);        //initial
        for(int i=0;i<str.length;i++) {
            str[i] = new MyChar(i,(char)(65+i));
        }
        setPos();
    }
    //Overridden so we can exit when window is closed
    protected void processWindowEvent(WindowEvent e) {
      super.processWindowEvent(e);
      if (e.getID() == WindowEvent.WINDOW_CLOSING)
      {
        System.exit(0);
      }
    }    public void run() {
        Thread theThread = Thread.currentThread();        while(flag) {
            setPos();
            panel1.repaint();
            try {
                theThread.sleep(300);
            } catch(InterruptedException ie) {
                ie.printStackTrace();
            }
        }
    }    public void setPos() {
        yStep+=3;
        for(int i=0;i<str.length;i++) {
            str[i].setPosition(300-(20-i*2+yStep));
        }
    }    void jButton1_actionPerformed(ActionEvent e) {
        if(myThread == null) {
         flag=true;
            myThread = new Thread(this);
            myThread.start();
        }else{
         flag=false;
         myThread=null;
        }
    }    class MyChar {
        int x,y;
        char ch;
        int index = 0;
        boolean direct = false;        public MyChar(int index,char ch) {
            this.ch = ch;
            this.index = index;
        }        public void setPosition(int y) {
            if(direct) {
                index++;
                if(index == str.length)
                    direct = false;
            } else {
                index--;
                if(index == 0)
                    direct = true;
            }
            this.x = (int)(Math.cos(((double)((index/10.0f)*Math.PI))) * 40.0f)+xCenter;
            this.y = y;
        }        public void draw(Graphics g) {
            g.drawString(new String(new char[]{ch}),x,y);
        }
    }    class MyPanel extends JPanel {
        public MyPanel() {
        }        public void paint(Graphics g) {
            g.setColor(Color.white);
            g.fillRect(0,0,400,500);
            g.setColor(Color.blue);
            for(int i=0;i<str.length;i++) {
                str[i].draw(g);
            }
        }
    }    public static void main(String[] args) {
        graphicFrame frame = new graphicFrame();
        frame.validate();
        frame.setVisible(true);
    }
}//记着给点分,我正努力加分呢