Java多线程-线程按序交替

线程按序交替

编写一个程序，开启三个线程，这三个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，要求输出的结果必须按顺序显示，如:ABCABCABC……依次递归。

使用Condition进行线程间通信即可(也可以使用wait()和notify()):

package JavaThread;

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

/**
* Created by yangl on 2017/7/6.
* 编写一个程序，开启三个线程，这三个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，
* 要求输出的结果必须按顺序显示，如:ABCABCABC......依次递归。
*/
public class ABCABCThread {

private int number = 1;//当前正在执行线程的标记
private Lock lock = new ReentrantLock();
private Condition condition1 = lock.newCondition();
private Condition condition2 = lock.newCondition();
private Condition condition3 = lock.newCondition();

public void loopA(int totalLoop)
{
lock.lock();
try {
//判断number
if (number != 1)
{
condition1.await();
}

for (int i = 0;i <= 0;i++)
{
System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
}

number = 2;
condition2.signal();
}
catch (Exception e)
{
e.printStackTrace();
}

finally {
lock.unlock();
}
}

public void loopB(int totalLoop)
{
lock.lock();
try {
//判断number
if (number != 2)
{
condition2.await();
}

for (int i = 0;i <= 0;i++)
{
System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
}

number = 3;
condition3.signal();
}
catch (Exception e)
{
e.printStackTrace();
}

finally {
lock.unlock();
}
}

public void loopC(int totalLoop)
{
lock.lock();
try {
//判断number
if (number != 3)
{
condition3.await();
}

for (int i = 0;i <= 0;i++)
{
System.out.println(Thread.currentThread().getName() + "\t" + i + "\t" + totalLoop);
}

number = 1;
condition1.signal();
}
catch (Exception e)
{
e.printStackTrace();
}

finally {
lock.unlock();
}
}

public static void main(String [] argsd){
ABCABCThread at = new ABCABCThread();
new Thread(new Runnable()
{
@Override
public void run()
{
for (int i = 0;i < 10;i++){
at.loopA(i);
}
}
},"A").start();

new Thread(new Runnable()
{
@Override
public void run()
{
for (int i = 0;i < 10;i++){
at.loopB(i);
}
}
},"B").start();

new Thread(new Runnable()
{
@Override
public void run()
{
for (int i = 0;i < 10;i++){
at.loopC(i);
System.out.println("-----------------------------------------------");
}
}
},"C").start();
}
}