聊聊Condition

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本文可作为传智播客《张孝祥-Java多线程与并发库高级应用》的学习笔记。

上面我们说了Lock,那是对synchronized的一种更为面向对象的替代,在原来的synchronized内部,我们可以调用object的wait与notify方法,那么使用lock之后,如何进行线程的通信呢。

对锁不清楚的朋友可以看看

http://blog.csdn.net/dlf123321/article/details/42919085

package cn.itcast.heima2;


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


public class ThreeConditionCommunication {


	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		final Business business = new Business();
		new Thread(
				new Runnable() {
					
					@Override
					public void run() {
					
						for(int i=1;i<=4;i++){
							business.sub2(i);
						}
						
					}
				}
		).start();
		
		new Thread(
				new Runnable() {
					
					@Override
					public void run() {
					
						for(int i=1;i<=4;i++){
							business.sub3(i);
						}
						
					}
				}
		).start();		
		
		for(int i=1;i<=4;i++){
			business.main(i);
		}
		
	}


	static class Business {
			Lock lock = new ReentrantLock();
			Condition condition1 = lock.newCondition();
			Condition condition2 = lock.newCondition();
			Condition condition3 = lock.newCondition();
		  private int shouldSub = 1;
		  public  void sub2(int i){
			  lock.lock();
			  try{
				  while(shouldSub != 2){
					  try {
						condition2.await();
					} catch (Exception e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				  }
					for(int j=1;j<=20;j++){
						System.out.println("sub2 thread sequence of " + j + ",loop of " + i);
					}
				  shouldSub = 3;
				  condition3.signal();
			  }finally{
				  lock.unlock();
			  }
		  }


		  public  void sub3(int i){
			  lock.lock();
			  try{
				  while(shouldSub != 3){
					  try {
						condition3.await();
					} catch (Exception e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				  }
					for(int j=1;j<=30;j++){
						System.out.println("sub3 thread sequence of " + j + ",loop of " + i);
					}
				  shouldSub = 1;
				  condition1.signal();
			  }finally{
				  lock.unlock();
			  }
		  }		  
		  
		  public  void main(int i){
			  lock.lock();
			  try{
				 while(shouldSub != 1){
				  		try {
							condition1.await();
						} catch (Exception e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
				  	}
					for(int j=1;j<=10;j++){
						System.out.println("main thread sequence of " + j + ",loop of " + i);
					}
					shouldSub = 2;
					condition2.signal();
		  }finally{
			  lock.unlock();
		  }
	  }
	
	}
}

聊聊Condition

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原文地址：http://blog.csdn.net/dlf123321/article/details/51366228