javaSE复习之——多线程_JDK5新特性互斥锁

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概述

它是锁（synchronized）的封装类，它更加的强大

互斥锁类

reentrantLock

监视器类

Condition（封装了一下Object中的监视器方法）

互斥锁方法

  • .lock()

    获得一个锁

  • .unlock()

    释放此锁

  • .newCondition()

    获取一个Condition监视器对象，用来进行线程通信

通过互斥锁线程通信示例

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class Printer3 {
	private ReentrantLock r = new ReentrantLock();
	private Condition c1 = r.newCondition();
	private Condition c2 = r.newCondition();
	private Condition c3 = r.newCondition();
	
	private int flag = 1;
	public void print1() throws InterruptedException {							
		r.lock();
		//获取锁
			if(flag != 1) {
				c1.await();
			}
			System.out.print("加");
			System.out.print("油");
			System.out.print("加");
			System.out.print("油");
			System.out.print("！");
			System.out.print("\r\n");
			flag = 2;
			//this.notify();
			//随机唤醒单个等待的线程
			c2.signal();
		r.unlock();
		//释放锁
	}
	
	public void print2() throws InterruptedException {
		r.lock();
			if(flag != 2) {
				c2.await();
			}
			System.out.print("加");
			System.out.print("油");
			System.out.print("加");
			System.out.print("油");
			System.out.print("\r\n");
			flag = 3;
			//this.notify();
			c3.signal();
		r.unlock();
	}
	
	public void print3() throws InterruptedException {
		r.lock();
			if(flag != 3) {
				c3.await();
			}
			System.out.print("a");
			System.out.print("b");
			System.out.print("c");
			System.out.print("d");
			System.out.print("e");
			System.out.print("f");
			System.out.print("g");
			System.out.print("\r\n");
			flag = 1;
			c1.signal();
		r.unlock();
	}
}