线程同步之死锁

/*
 * 死锁就是俩个线程争夺公共资源，
 * 俩个线程个自锁住一个资源
 * 只有俩个同时锁住满足条件才能继续运行，
 * 但都不肯让步，陷入死锁状态
 */
public class TestDeadLock implements Runnable{
	public int flag =1;
	static Object o1=new 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();
	}

}