求助：我敲的马士兵的死锁例子没有出现死锁是为什么呢？

[Leon_Ang]

网上有人说原因是没设置Object类为static
可是我写了啊，，，为什么还是不能死锁。。。求高手指点= =

/**
 * Created by Leon on 2017/5/22.
 */
public class TestDeadLock implements Runnable
{
    public int flag=1;
    public static Object o1=new Object();
    public static Object o2=new Object();

    public void run()
    {
        System.out.println("flag="+flag);
        if (flag==1)
        {
            synchronized(o1)
            {
                try
                {
                    Thread.sleep(500);
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
            }
            synchronized (o2)
            {
                System.out.println("1");
            }
        }
        if (flag==0)
        {
            synchronized (o2)
            {
                try
                {
                    Thread.sleep(500);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
            synchronized (o1)
            {
                System.out.println("0");
            }
        }
    }
    public static void main(String[] args)
    {
        TestDeadLock td1=new TestDeadLock();
        TestDeadLock td2=new TestDeadLock();
        td1.flag=1;
        td2.flag=0;

        Thread t1=new Thread(td1);
        Thread t2=new Thread(td2);

        t1.start();
        t2.start();
    }
}

输出是：
flag=1
flag=0
1
0

[李德胜1995]

public class TestDeadLock implements Runnable
{
    public int flag=1;
    public static Object o1=new Object();
    public static Object o2=new Object();
 
    public void run()
    {
        System.out.println("flag="+flag);
        if (flag==1)
        {
            synchronized(o1)
            {
                try
                {
                    Thread.sleep(500);
                    synchronized (o2)
                    {
                        System.out.println("1");
                    }
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
        if (flag==0)
        {
            synchronized (o2)
            {
                try
                {
                    Thread.sleep(500);
                    synchronized (o1)
                    {
                        System.out.println("0");
                    }
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
    }
    public static void main(String[] args)
    {
        TestDeadLock td1=new TestDeadLock();
        TestDeadLock td2=new TestDeadLock();
        td1.flag=1;
        td2.flag=0;
 
        Thread t1=new Thread(td1);
        Thread t2=new Thread(td2);
 
        t1.start();
        t2.start();
    }
}

[Leon_Ang]

引用 1 楼 pany1209 的回复:

public class TestDeadLock implements Runnable
{
    public int flag=1;
    public static Object o1=new Object();
    public static Object o2=new Object();
 
    public void run()
    {
        System.out.println("flag="+flag);
        if (flag==1)
        {
            synchronized(o1)
            {
                try
                {
                    Thread.sleep(500);
                    synchronized (o2)
                    {
                        System.out.println("1");
                    }
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
        if (flag==0)
        {
            synchronized (o2)
            {
                try
                {
                    Thread.sleep(500);
                    synchronized (o1)
                    {
                        System.out.println("0");
                    }
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
    }
    public static void main(String[] args)
    {
        TestDeadLock td1=new TestDeadLock();
        TestDeadLock td2=new TestDeadLock();
        td1.flag=1;
        td2.flag=0;
 
        Thread t1=new Thread(td1);
        Thread t2=new Thread(td2);
 
        t1.start();
        t2.start();
    }
}

啊 这个问题好弱智。。。。捂脸遁orz