package qzy.thread.deadLock;/*** @描述模擬死鎖** 形成死鎖的四個(gè)必要條件是什么** 1.互斥條件：線程(進(jìn)程)對(duì)于所分配到的資源具有排它性，即一個(gè)資源只能被一個(gè)線程(進(jìn)程)占用，直到被該線程(進(jìn)程)釋放* 2.請(qǐng)求與保持條件：一個(gè)線程(進(jìn)程)因請(qǐng)求被占用資源而發(fā)生阻塞時(shí)，對(duì)已獲得的資源保持不放。* 3.不剝奪條件：線程(進(jìn)程)已獲得的資源在末使用完之前不能被其他線程強(qiáng)行剝奪，只有自己使用完畢后才釋放資源。* 4.循環(huán)等待條件：當(dāng)發(fā)生死鎖時(shí)，所等待的線程(進(jìn)程)必定會(huì)形成一個(gè)環(huán)路（類似于死循環(huán)），造成永久阻塞*** @創(chuàng)建人 joy_qiu* @創(chuàng)建時(shí)間 * @修改人和其它信息*/ public class DeadLockDemo {private static Object o1 = new Object();private static Object o2 = new Object();public static void main(String[] args) {new Thread(() -> {synchronized (o1){System.out.println(Thread.currentThread()+":獲取到o1的鎖");try{Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread()+":等待獲取o2的鎖");synchronized (o2){System.out.println(Thread.currentThread()+":獲取到o2的鎖");}}},"線程1").start();new Thread(() -> {synchronized (o2){System.out.println(Thread.currentThread()+":獲取到o2的鎖");try{Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread()+":等待獲取o1的鎖");synchronized (o1){System.out.println(Thread.currentThread()+":獲取到o1的鎖");}}},"線程2").start();} }/*** 解決死鎖的例子*/ class UnDeadLock{private static Object o1 = new Object();private static Object o2 = new Object();public static void main(String[] args) {new Thread(() -> {synchronized (o1){System.out.println(Thread.currentThread()+":獲取到o1的鎖");try{Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread()+":等待獲取o2的鎖");synchronized (o2){System.out.println(Thread.currentThread()+":獲取到o2的鎖");}}},"線程1").start();new Thread(() -> {synchronized (o1){System.out.println(Thread.currentThread()+":獲取到o1的鎖");try{Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread()+":等待獲取o2的鎖");synchronized (o2){System.out.println(Thread.currentThread()+":獲取到o2的鎖");}}},"線程2").start();} }

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