实现Runnable接口实现多线程，实现资源共享

[Scaarf]

不是说实现Runnable接口能实现共享么，为啥我这个运行出来有重复的结果出现。。。。。还是我哪写的不对

class A implements Runnable{
	private static int  totalTicketNumber=100;//总票数
	private String name;
	public A(String name) {
		this.name=name;
	}
	
	@Override
	public void run() {
	  	for (int j = 0; j < 5; j++) {
	  		totalTicketNumber--;
	  		System.out.println(totalTicketNumber);
		}	
	}
	
	public static void main(String[] args) throws InterruptedException {
		String name="线程";
		A a=new A(name);
		for (int i = 1; i <= 5; i++) {
			Thread t=new Thread(a);
			t.start();
		}	
	}
	
}

[不佑天]

由于多线程交替运行totalTicketNumber－－后可能会切换到其他线程，等切换回来时totalTicketNumber的值已经改变了

[一个帅逼]

你需要用synchronized来控制线程同步

[一个帅逼]

class A implements Runnable{
    private static int  totalTicketNumber=100;//总票数
    private String name;
    public A(String name) {
        this.name=name;
    }
     
    @Override
    public void run() {
        for (int j = 0; j < 5; j++) {
            try {
            	Thread.sleep(1000);
            } catch (InterruptedException e) {
			// TODO Auto-generated catch block
            	e.printStackTrace();
            }
        	synchronized (this) {
                totalTicketNumber--;
                System.out.println(Thread.currentThread().getName()+" "+totalTicketNumber);
        	} 

		  }
    	}
     
    public static void main(String[] args) throws InterruptedException {
        String name="线程";
        A a=new A(name);
        for (int i = 1; i <= 5; i++) {
            Thread t=new Thread(a,"线程"+i);
            t.start();
        }   

    }
     
}

可以改成这样

[繁华终归落尽]

public class A implements Runnable{
    private static AtomicInteger atomInteger = new AtomicInteger(0);//总票数
    private static int total = 0;
    
    private String name;
    public A(String name) {
        this.name=name;
    }
    
    public int decrement() {
    	return atomInteger.decrementAndGet();
    }
    
    @Override
    public void run() {
        for (int j = 0; j < 5; j++) {
            decrement();
            total -- ;
        }
    }
    
    public static void main(String[] args) throws InterruptedException {
        for (int i = 1; i <= 10000; i++) {
        	String name="线程" + i;
        	A a=new A(name);
            Thread t=new Thread(a);
            t.start();
        }
        
        Thread.sleep(5000L);
        System.out.println("atomInteger : " + atomInteger.get());
        System.out.println("int : " + total);
    }
}

-- / ++ 都不是线程安全的，你的totalTicketNumber可以用AtomicInteger代替，或者像楼上一样加锁