Synchronize死鎖

雙方互相持有，對方的鎖
導致，程序無法繼續執行

package com.bjsxt.base.sync006;/*** 死鎖問題，在設計程序時就應該避免雙方相互持有對方的鎖的情況**/ public class DeadLock implements Runnable {private String tag;private static Object lock1 = new Object();private static Object lock2 = new Object();public void setTag(String tag) {this.tag = tag;}@Overridepublic void run() {if (tag.equals("a")) {synchronized (lock1) {try {System.out.println("當前線程 : " + Thread.currentThread().getName() + " 進入lock1執行");Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (lock2) {System.out.println("當前線程 : " + Thread.currentThread().getName() + " 進入lock2執行");}}}if (tag.equals("b")) {synchronized (lock2) {try {System.out.println("當前線程 : " + Thread.currentThread().getName() + " 進入lock2執行");Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (lock1) {System.out.println("當前線程 : " + Thread.currentThread().getName() + " 進入lock1執行");}}}}public static void main(String[] args) {DeadLock d1 = new DeadLock();d1.setTag("a");DeadLock d2 = new DeadLock();d2.setTag("b");Thread t1 = new Thread(d1, "t1");Thread t2 = new Thread(d2, "t2");t1.start();try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}t2.start();}}

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