java多线程-使用ReentrantLock实现线程的顺序执行

测试例子：

package serializer.pattern;

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

public class Main {
	
	volatile private static int nextPrintWho = 1;
	private static  ReentrantLock lock = new ReentrantLock();
	
	final private static Condition conditionA = lock.newCondition();
	final private static Condition conditionB = lock.newCondition();
	final private static Condition conditionC = lock.newCondition();
	
	public static void main(String[] args){
		
		Thread threadA = new Thread(){
			public void run(){
				try {
					lock.lock();
					while(nextPrintWho != 1){
						conditionA.await();
					}
					
					for(int i=0;i<3;i++){
						System.out.println("ThreadA:"+(i+1));
					}
					nextPrintWho = 2;
					conditionA.signalAll();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally{
					lock.unlock();
				}
			}
		};
		
		
		Thread threadB = new Thread(){
			public void run(){
				try {
					lock.lock();
					while(nextPrintWho != 2){
						conditionA.await();
					}
					
					for(int i=0;i<3;i++){
						System.out.println("ThreadB:"+(i+1));
					}
					nextPrintWho = 3;
					conditionA.signalAll();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally{
					lock.unlock();
				}
			}
		};
		
		Thread threadC = new Thread(){
			public void run(){
				try {
					lock.lock();
					while(nextPrintWho != 3){
						conditionA.await();
					}
					
					for(int i=0;i<3;i++){
						System.out.println("ThreadC:"+(i+1));
					}
					nextPrintWho = 1;
					conditionA.signalAll();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally{
					lock.unlock();
				}
			}
		};
		
		
		Thread[] aArray = new Thread[5];
		Thread[] bArray = new Thread[5];
		Thread[] cArray = new Thread[5];
		
		for(int i=0;i<5;i++){
			
			aArray[i] = new Thread(threadA);
			bArray[i] = new Thread(threadB);
			cArray[i] = new Thread(threadC);
			
			aArray[i].start();
			bArray[i].start();
			cArray[i].start();
		}
		
	}

}