wait()是Object的方法，sleep()是Thread的方法。

wait()必須采用同步方法，不需要sleep()方法。

線程在同步方法中執(zhí)行sleep()方法，不釋放monitor鎖，wait()方法釋放monitor鎖。

短暫休眠后，sleep()方法會(huì)主動(dòng)退出阻塞，而wait()方法需要在沒有指定wait時(shí)間的情況下被其他線程中斷才能退出阻塞。

import java.text.SimpleDateFormat;import java.util.Date;public class TestSleepAndWait {public static void main(String[] args) {new Thread1().start();try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}new Thread2().start();}}class Thread1 extends Thread{private void sout(String s){System.out.println(s+' '+new SimpleDateFormat('HH:mm:ss:SS').format(new Date()));}@Overridepublic void run() {sout('enter Thread1.run');synchronized (TestSleepAndWait.class){//wait只能在同步代碼塊或者同步方法中使用sout('Thread1 is going to wait');try {TestSleepAndWait.class.wait(); // 這里只能使用持有鎖TestSleepAndWait.class.wait()，使用其他對(duì)象則報(bào)錯(cuò)java.lang.IllegalMonitorStateException} catch (InterruptedException e) {e.printStackTrace();}sout('after waiting, thread1 is going on');sout('thread1 is over');}}}class Thread2 extends Thread{private void sout(String s){System.out.println(s+' '+new SimpleDateFormat('HH:mm:ss:SS').format(new Date()));}@Overridepublic void run() {sout('enter Thread2.run');synchronized (TestSleepAndWait.class){//wait只能在同步代碼塊或者同步方法中使用sout('Thread2 is going to notify');TestSleepAndWait.class.notify(); 這里只能使用持有鎖TestSleepAndWait.classsout('thread2 is going to sleep 10ms');try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}sout('after sleeping, thread2 is going on');sout('thread2 is over');}}}

內(nèi)容擴(kuò)展：

/** * */package com.b510.test;/** * java中的sleep()和wait()的區(qū)別 * @author Hongten Java學(xué)習(xí)交流QQ群：589809992 我們一起學(xué)Java！ * @date 2013-12-10 */public class TestD { public static void main(String[] args) { new Thread(new Thread1()).start(); try { Thread.sleep(5000); } catch (Exception e) { e.printStackTrace(); } new Thread(new Thread2()).start(); } private static class Thread1 implements Runnable{ @Override public void run(){ synchronized (TestD.class) { System.out.println('enter thread1...');System.out.println('thread1 is waiting...'); try {//調(diào)用wait()方法，線程會(huì)放棄對(duì)象鎖，進(jìn)入等待此對(duì)象的等待鎖定池TestD.class.wait(); } catch (Exception e) {e.printStackTrace(); } System.out.println('thread1 is going on ....'); System.out.println('thread1 is over!!!'); } } } private static class Thread2 implements Runnable{ @Override public void run(){ synchronized (TestD.class) {System.out.println('enter thread2....');System.out.println('thread2 is sleep....');//只有針對(duì)此對(duì)象調(diào)用notify()方法后本線程才進(jìn)入對(duì)象鎖定池準(zhǔn)備獲取對(duì)象鎖進(jìn)入運(yùn)行狀態(tài)。TestD.class.notify();//==================//區(qū)別//如果我們把代碼：TestD.class.notify();給注釋掉，即TestD.class調(diào)用了wait()方法，但是沒有調(diào)用notify()//方法，則線程永遠(yuǎn)處于掛起狀態(tài)。try { //sleep()方法導(dǎo)致了程序暫停執(zhí)行指定的時(shí)間，讓出cpu該其他線程， //但是他的監(jiān)控狀態(tài)依然保持者，當(dāng)指定的時(shí)間到了又會(huì)自動(dòng)恢復(fù)運(yùn)行狀態(tài)。 //在調(diào)用sleep()方法的過程中，線程不會(huì)釋放對(duì)象鎖。 Thread.sleep(5000);} catch (Exception e) { e.printStackTrace();}System.out.println('thread2 is going on....');System.out.println('thread2 is over!!!'); } } }}

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