package com.lp.ecjtu.Thread;/*
死锁：常见情景之一：同步的嵌套。*/
class Ticket implements Runnable
{private  int num = 100;Object obj = new Object();boolean flag = true;public void run(){if(flag)while(true){synchronized(obj)//同步代码块里面调用同步函数
                {show();}}elsewhile(true)this.show();}public synchronized void show()//同步函数里面的调用同步代码块
    {synchronized(obj){if(num>0){try{Thread.sleep(10);}catch (InterruptedException e){}System.out.println(Thread.currentThread().getName()+".....sale...."+num--);}}}
}public class DeathLockThread1
{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(InterruptedException e){}t.flag = false;t2.start();}
}

package com.lp.ecjtu.Thread;class DeathLockRunable implements Runnable{private boolean flag;public DeathLockRunable(boolean flag){this.flag = flag;}@Overridepublic void run() {if(flag){synchronized (Lock.mylock1){System.out.println("if mylock1"+Thread.currentThread().getName());synchronized (Lock.mylock2){System.out.println("if mylock2"+Thread.currentThread().getName());}}}else{synchronized (Lock.mylock2){System.out.println("else mylock2"+Thread.currentThread().getName());synchronized (Lock.mylock1){System.out.println("else mylock1"+Thread.currentThread().getName());}}}}}class Lock{static Object mylock1 = new Object();static Object mylock2 = new Object();}public class DeathLockThread{public static void main(String[] args){Thread t1 = new Thread(new DeathLockRunable(true));Thread t2 = new Thread(new DeathLockRunable(false));t1.start();t2.start();}}