Example9_12

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package itat;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Date;

public class Example9_12 {

public static void main(String[] args){
new Win1();
}

}
class Win1 extends Frame implements Runnable,ActionListener{

Thread thread=null;
TextArea text=null;
Button buttonStart=new Button("Start");
Button buttonStop=new Button("Stop");
boolean die;
Win1(){
  thread=new Thread(this);
  text=new TextArea();
  add(text,BorderLayout.CENTER);
  Panel p=new Panel();
  p.add(buttonStart);
  p.add(buttonStop);
  buttonStart.addActionListener(this);
  buttonStop.addActionListener(this);
  add(p,BorderLayout.NORTH);
  setVisible(true);
  setSize(500,500);
  validate();
  addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
     System.exit(0);
    }
  });
}

public void run() {
  // TODO Auto-generated method stub
  while(true){
   text.append("/n"+new Date());
   try {
    thread.sleep(1000);
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   if(die==true){
    return;
   }

  }
}

public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
  if(e.getSource()==buttonStart){
   if(!(thread.isAlive())){
    thread=new Thread(this);
    die=false;
   }
   try{
   thread.start();
   }catch(Exception eh){
    text.setText("线程没有结束run()方法之前，不要再调用start()方法");
   }

  }
  else if(e.getSource()==buttonStop){
   die=true;
  }
}

}