141多线程-死锁

/*
死锁：
同步中嵌套同步
*/

class Ticket implements Runnable{
	private int tick = 1000;
	Object obj = new Object();
	boolean flag = true;
	public void run(){
		if(flag){
			while(true){
				synchronized(obj){
						show();						
				}
			}
		}
		else
			while(true)
				show();
	}
	public synchronized void show(){
		synchronized(obj){
			if(tick>0){
				try{Thread.sleep(10);}catch(Exception e){}
				System.out.println(Thread.currentThread().getName()
				+"  code  "+tick--);
			}
		}
	}
}
class Deadlock{
	public static void main(String[] args){
		Ticket t = new Ticket();
		Thread t1 = new Thread(t);
		Thread t2 = new Thread(t);
		t1.start();
		try{Thread.sleep(10);}catch(Exception e){}
		t.flag =  false;
		t2.start();
	}
}

class Test implements Runnable{
	private boolean flag;
	Test(boolean flag){
		this.flag = flag;
	}
	public void run(){
		if(flag){
			synchronized(MyLock.locka){
				System.out.println("if locka");
				synchronized(MyLock.lockb){
					System.out.println("if lockb");
				}
			}
		}
		else{
			synchronized(MyLock.lockb){
				System.out.println("MyLock.lockb");
				synchronized(MyLock.locka){
					System.out.println("MyLock.locka");
				}
			}
		}
	}
}

class MyLock{
	static Object locka = new Objecet();
	static Object lockb = new Objecet();
}
class Deadlock{
	public static void main(String[] args){
		Thread t1 = new Thread(new Test(true));
		Thread t2 = new Thread(new Test(false));
		t1.start();
		t2.start();
	}
}