Thingking in Java学习笔记 wait() notifyAll()

共享资源是汽车Car，需要不断的打蜡waxed()和抛光buffed()，waxed()要等待buffed()完成，buffed()又要等待waxed()完成 

<pre name="code" class="java">package com.test.concurrent;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;public class WaxOMatic {public static void main(String[] args) throws InterruptedException {// TODO Auto-generated method stubCar car=new Car();ExecutorService exec=Executors.newCachedThreadPool();exec.execute(new WaxOn(car));exec.execute(new WaxOff(car));TimeUnit.SECONDS.sleep(1);System.out.println("trying to terminate all threads!!!!!");exec.shutdownNow();}}class Car{private boolean waxOn=false;public synchronized void waxed(){//打蜡System.out.println("waxOn!");waxOn=true;notifyAll();}public synchronized void buffed(){//抛光System.out.println("waxOff!");waxOn=false;notifyAll();}public synchronized void waitingForWaxing() throws InterruptedException{while(false==waxOn){System.out.println("waiting for Waxing!");wait();}}public synchronized void waitingForBufferring() throws InterruptedException{while(true==waxOn){System.out.println("waiting for Bufferring!");wait();}}}class WaxOn implements Runnable{private Car car;public WaxOn(Car c){car=c;}@Overridepublic void run(){try{while(!Thread.interrupted()){car.waxed();TimeUnit.MILLISECONDS.sleep(200);car.waitingForBufferring();}}catch(InterruptedException e){System.out.println("waxed interrupt exception");}System.out.println("waxed car end-------");}}class WaxOff implements Runnable{private Car car;public WaxOff(Car c){car=c;}@Overridepublic void run(){try{while(!Thread.interrupted()){car.waitingForWaxing();car.buffed();TimeUnit.MILLISECONDS.sleep(200);}}catch(InterruptedException e){System.out.println("buffed interrupt exception");}System.out.println("buffed car end-------");}}

输出：

waxOn!
waxOff!
waxOn!
waxOff!
waxOn!
waxOff!
waxOn!
waxOff!
waiting for Waxing!
waxOn!
waxOff!
trying to terminate all threads!!!!!
buffered car end-------
waxed car end-------
ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [../../../src/share/back/util.c:838]