j2me线程同步

package prj9_1;

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet6 extends MIDlet {

protected void startApp() throws MIDletStateChangeException {

TicketThread tt = new TicketThread();

Thread th1 = new Thread(tt);

Thread th2 = new Thread(tt);

th1.start();

th2.start();

}

 

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

// TODO Auto-generated method stub

}

protected void pauseApp() {

// TODO Auto-generated method stub

}

 

class TicketThread implements Runnable{

private int ticketNum = 10;

public void run(){

while(true){

synchronized(this){//synchronized(this)为函数加锁,当函数没有执行完,其它线程不能进入执行该函数,直到该函数被执行完

//就像给一个门加上锁,一个人拿钥匙进了门,另一个人要等到这个人出来交出钥匙才能进去

if(ticketNum==0){

System.out.println("没有票了");

break;

}

else{

try{

Thread.currentThread().sleep(1000);

}catch(Exception ex){}

ticketNum--;

System.out.println(Thread.currentThread().getName()+"卖出一张票,还剩下"+ticketNum+"张票");

}

}

}

}

}

 

}

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