java线程通信

<pre name="code" class="java">package com.norelax.www;
//传统的线程通信，主线程执行100次，子线程执行50次，主线程和子线程交替执行
public class TraditionalThreadCommunication {
public static void main(String[] args) {
final Business business=new Business();
new Thread(new Runnable() {
public void run() {
business.sub();
}
}).start();
business.main();
}

}

class Business{
//标志位用来标示是否要执行子线程
boolean bShouldSub=true;
//子线程执行方法
public synchronized void sub() {
while (!bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int i = 1; i <= 50; i++) {
System.out.println("sub thread sequence of " +i);
}
bShouldSub=false;
//唤醒主线程
this.notify();
}
//主线程执行方法
public synchronized void main(){
while (bShouldSub) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int i = 1; i <= 100; i++) {
System.out.println("main thread sequence of " +i);
}
bShouldSub=true;
//唤醒子线程
this.notify();

}
}

<pre name="code" class="java">package com.norelax.www;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
* 三种线程之间的通信问题
*
* @author wusong 实例：主线程循环50次后休眠，叫醒子线程sub2执行10后休眠，叫醒子线程sub3执行20次后休眠,叫醒主线程
*/
public class ThreeThreadCommunication {

public static void main(String[] args) {
final Business business = new Business();
new Thread(new Runnable() {
public void run() {
for (int i = 0; i < 10; i++) {
business.sub2();
}
}
}).start();

new Thread(){
public void run() {
for (int i = 0; i < 10; i++) {
business.sub3();
}
}}.start();
for (int i = 0; i < 10; i++) {
business.main();
}
}
static class Business {
Lock lock=new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Condition condition3 = lock.newCondition();
//线程执行的标志位
int bShouldSub=1;
//主线程方法
public void main(){
//加锁
lock.lock();
try {
while (bShouldSub!=1) {
condition1.await();
}
for (int i = 1; i <=50; i++) {
System.out.println("main thread sequence of "+i);
}
bShouldSub=2;
//唤醒sub2线程
condition2.signal();
} catch (Exception e) {
e.printStackTrace();
}finally{
//最终锁要示释放
lock.unlock();
}
}
//子线程2的方法
public void sub2(){
//加锁
lock.lock();
try {
while (bShouldSub!=2) {
condition2.await();
}
for (int i = 1; i <=10; i++) {
System.out.println("sub2 thread sequence of "+i);
}
bShouldSub=3;
//唤醒sub3线程
condition3.signal();
} catch (Exception e) {
e.printStackTrace();
}finally{
//最终锁要示释放
lock.unlock();
}
}
//子线程3的方法
public void sub3(){
//加锁
lock.lock();
try {
while (bShouldSub!=3) {
condition3.await();
}
for (int i = 1; i <=20; i++) {
System.out.println("sub3 thread sequence of "+i);
}
bShouldSub=1;
//唤醒sub3线程
condition1.signal();
} catch (Exception e) {
e.printStackTrace();
}finally{
//最终锁要示释放
lock.unlock();
}

}
}
}

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