import java.awt.*;
import java.awt.event.*;
public class Welcome extends WindowAdapter implements ActionListener{
 Frame f;
 static Welcome.Thread3 wt1,wt2;
 public static void main(String args[]){
  Welcome w=new Welcome();
  w.display();
  wt1=w.new Thread3("welcome!");
  wt2=w.new Thread3("how are you?");
  wt2.start();
  wt2.setButton();
 }
 public void display(){
  f=new Frame("welcome");
  f.setSize(400,240);
  f.setLocation(200,140);
  f.setBackground(Color.lightGray);
  f.setLayout(new GridLayout(4,1));
  f.addWindowListener(this);
  f.setVisible(true);
 }
 public class Thread3 extends Thread{
  Panel p1;
  Label lb1;
  TextField tf1,tf2;
  Button b1,b2;
  int sleeptime=(int)(Math.random()*100);
  public Thread3(String str){
   super(str);
   for(int i=0;i<100;i++)
   str=str+"";
   tf1=new TextField(str);
   f.add(tf1);
   p1=new Panel();
   p1.setLayout(new FlowLayout(FlowLayout.LEFT));
   lb1=new Label("sleep");
   tf2=new TextField(""+sleeptime);
   p1.add(lb1);
   p1.add(tf2);
   b1=new Button("启动");
   b2=new Button("中断");
   p1.add(b1);
   p1.add(b2);
   b1.addActionListener(new Welcome());
   b2.addActionListener(new Welcome());
   f.add(p1);
   f.setVisible(true);
   
  }
  public void run(){
   String str;
   while(this.isAlive()&&!this.isInterrupted()){
    try{
     str=tf1.getText();
     str=str.substring(1)+str.substring(0,1);
     tf1.setText(str);
     this.sleep(sleeptime);
    }
    catch(InterruptedException e){
     System.out.println(e);
     break;
    }
   }
  }
  public void setButton(){
   if(this.isAlive()) b1.setEnabled(false);
   if(this.isInterrupted()) b2.setEnabled(false);
  }
 }
 public void windowClosing(WindowEvent e){
  System.exit(0);
 }
 public void actionPerformed(ActionEvent e){
  if((e.getSource()==wt1.b1)||(e.getSource()==wt1.b2))
  actionPerformed(e,wt1);
  if((e.getSource()==wt2.b1)||(e.getSource()==wt2.b2))
  actionPerformed(e,wt2);
 }
 public void actionPerformed(ActionEvent e,Thread3 wt1)
 {if(e.getSource()==wt1.b1){
  wt1.sleeptime=Integer.parseInt(wt1.tf2.getText());
  wt1.start();
 }
 if(e.getSource()==wt1.b2)
 wt1.interrupt();
 wt1.setButton();
 }
 }

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