关于一个简单的多线程问题

[zhxlsuyu1984]

刚学java学到多线程这块按照自己的理解写了个模拟火车站售票的程序，可是运行结果还是会把一张票同时卖多次啊！！不知道是什么问题。

class ThreadDemo{
	public static void main(String [] args){
		ThreadTest tt = new ThreadTest();
		new Thread(tt).start();
		new Thread(tt).start();
		new Thread(tt).start();
		new Thread(tt).start();
	
	}
}

class ThreadTest implements Runnable{
	public void run(){
		int tickets = 100;
		while(true && tickets>0){
				System.out.println(Thread.currentThread().getName()+" saling the ticket of "+tickets--);	
		}
	}
}

[monkeyking1987]

添加synchronized关键字试试看.

[若鱼1919]

class ThreadTest implements Runnable{
    int tickets = 100;
    public void run(){
        synchronized(this){
        while(true && tickets>0){
                System.out.println(Thread.currentThread().getName()+" saling the ticket of "+tickets--);    
        }
       } 
    }
}

[shine333]

public void run(){
int tickets = 100;
变成
static int tickets = 100;
public void run() {
....
}

[若鱼1919]

class ThreadTest implements Runnable{
    int tickets = 100;
    public void run(){   
           while(tickets>0){
		 try{
		      Thread.sleep(100);
	         }catch(Exception e){}
		 synchronized(this){
		    if(tickets>0)System.out.println(Thread.currentThread().getName()+" saling the ticket of "+tickets--); 
		 }
	  }   
    }
}

[cz61919345]

[Quote=引用 4 楼 goldenfish1919 的回复:]
Java codeclass ThreadTestimplements Runnable{int tickets=100;publicvoid run(){while(tickets>0){try{
Thread.sleep(100);
}catch(Exception e){}synchronized(this){if(tickets>0)System.out.println(Thread.currentThread().getName()+" saling the ticket of"+tickets--);
}
}
}
}
[/Quote]正解呀!