线程间通信 java_java多线程之线程间通信

package com.weeya.nine;

import java.util.concurrent.locks.Condition;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

/**

* @author skyarac

* 三个线程 老大唤醒老二，老二唤醒老三，老三唤醒老大

* 2013年12月16日

*/

public class ThreeConditionCommunication {

public static void main(String[] args) {

final Business business = new Business();

new Thread(new Runnable() { //老大线程

@Override

public void run() {

for (int i = 1; i <= 50; i++) {

business.main(i);

}

}

}).start();

new Thread(new Runnable() { //老二线程

@Override

public void run() {

for (int i = 1; i <= 50; i++) {

business.sub2(i);

}

}

}).start();

new Thread(new Runnable() { //老三线程

@Override

public void run() {

for (int i = 1; i <= 50; i++) {

business.sub3(i);

}

}

}).start();

}

}

class Business {

Lock lock = new ReentrantLock();

Condition condition1 = lock.newCondition();

Condition condition2 = lock.newCondition();

Condition condition3 = lock.newCondition();

private int shouldSub = 1;

/*

* @param i 老大

*/

public void main(int i) {

lock.lock();

while (shouldSub != 1) { // 这里可以使用if循环

try {

condition1.await();// 主线程等待

} catch (InterruptedException e) {

e.printStackTrace();

}

}

for (int j = 1; j <= 10; j++) {

System.out.println("老大 sequence of " + j + ",loop of " + i);

}

shouldSub = 2;

condition2.signal();

lock.unlock();

}

/*

* @param i 老二

*/

public void sub2(int i) {

lock.lock();

while (shouldSub != 2) { // 这里可以使用if循环

try {

condition2.await(); // 子线程等待

} catch (InterruptedException e) {

e.printStackTrace();

}

}

for (int j = 1; j <= 10; j++) {

System.out.println("老二 sequence of " + j + ",loop of " + i);

}

shouldSub = 3;

condition3.signal();

lock.unlock();

}

/*

* @param i 老三

*/

public void sub3(int i) {

lock.lock();

while (shouldSub != 3) { // 这里可以使用if循环

try {

condition3.await();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

for (int j = 1; j <= 10; j++) {

System.out.println("老三 sequence of " + j + ",loop of " + i);

}

shouldSub = 1;

condition1.signal();

lock.unlock();

}

}