死锁的例子

Posted 2020-12-03 volatileandcrazy

class Test implements Runnable
{
    private boolean flag; //flag标签，让t1和t2线程执行不同代码
    public Test(boolean flag)
    {
        this.flag=flag;
    }
    public void run()
    {
        if (flag)  
        {
            synchronized(MyLock.lock1)
            {
                System.out.println("if1");
 
                synchronized(MyLock.lock2)
                {
                System.out.println("if2");
                }
            }
        }
        else
        {
            synchronized(MyLock.lock2)
            {
                System.out.println("else2");
 
                synchronized(MyLock.lock1)
                {
                System.out.println("else1");
                }
            }
        }
    
    }
 
    
}
 
class MyLock  //两个锁，用来制造死锁
{
    public static Object lock1 = new Object();
    public static Object lock2 = new Object();
 
}
 
class DeadLock 
{
    public static void main(String[] args) 
    { 
        Thread t1 = new Thread(new Test(true)); //t1先用锁1再用锁2
        Thread t2 = new Thread(new Test(false));//t2先用锁2再用锁1
        
        t1.start();
        t2.start();
        
    }
}