和luster一起学习java编程(1)

import java.io.*;
class Counter extends Thread
{
int i = 0;
public void run()
{
while(i<20)
{
System.out.println(i++);
try
{
sleep(1000);
}
catch(InterruptedException e){}
}
System.out.println("I'm finished couting.");
}
}
class Listener extends Thread
{
DataInputStream userInput = new DataInputStream(System.in);
        String input="";
public void run()
{
while(!input.equals("Quit"))
{
try{input=userInput.readLine();}
catch(IOException e) {}
System.out.println("You typed"+input);
}
System.out.println("I'am finished listening.");
}
}
class HearYou
{
public static void main(String args[])
{
Thread counter = new Counter();
counter.setPriority(Thread.MAX_PRIORITY);
Thread listener = new Listener();
listener.setPriority(Thread.NORM_PRIORITY);
counter.start();
listener.start();
while(counter.isAlive()' 'listener.isAlive())
{
System.out.println("Something is still alive");
try{ Thread.sleep(3000);}
catch(InterruptedException e){}
}
System.out.println("no more. Good bye.");
}
}