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java中的 java.util.concurrent.locks.ReentrantLock类的使用方式

实现了lock的类为:ReentrantLock

接口的方式解释:

lock()方法为获取锁对象,如果未获取到锁就一直获取锁。

trylock():为布尔值,返回是否获取到了锁,如果没有获取到锁则返回false,如果获取到了则返回true

tryLock(long timeout, TimeUnit unit):表示在指定的时间内获取锁,如果未获取到,则返回false,否则返回true

unlock():为释放锁,使其他线程有机会执行。

lockInterruptibly():表示获取锁,如果线程被中断则抛出异常。

例如代码实例:

package TestThread.ThreadLockDemo;

import java.util.concurrent.locks.ReentrantLock;

public class TestLock {
	public static void main(String[] args) {
		ReentrantLock lock = new ReentrantLock();// 初始化lock对象
		Test2 test2 = new Test2("苹果", 100);// 初始化苹果的数量
		Test1 test1 = new Test1(lock, 10, test2);// 初始化线程对象
		Thread t1 = new Thread(test1, "线程1");// 创建线程
		Thread t2 = new Thread(test1, "线程2");
		Thread t3 = new Thread(test1, "线程3");
		t1.start();// 启动线程
		t2.start();
		t3.start();
	}
}

class Test1 implements Runnable {
	private int count;
	private ReentrantLock lock;
	private Test2 test2;

	public Test1(ReentrantLock lock, int count, Test2 test2) {
		this.lock = lock;
		this.count = count;
		this.test2 = test2;
	}

	@Override
	public void run() {
		lock.lock();// 枷锁
		try {
			test2.DiscountApple(count);
		} catch (Exception e) {
			System.out.print("调用卖苹果的方法发生异常!");
		} finally {
			lock.unlock();// 解锁
		}
	}
}

class Test2 {
	private String name;
	int count;

	/**
	 * @param name苹果的名字
	 * @param count初始化苹果的数量
	 */
	public Test2(String name, int count) {
		this.name = name;
		this.count = count;
	}

	/**
	 * * @author 作者 E-mail:
	 * 
	 * @date 创建时间:2017年3月24日 下午1:13:14
	 * @version 1.0
	 * @parameter
	 * @since
	 * @return
	 */
	public void DiscountApple(int discount) {
		this.count = this.count - discount;
		System.out.println(Thread.currentThread().getName() + ":苹果的数量为:" + this.count + ",卖掉了" + discount);
	}
}

实例结果:

 trylock()方法的使用演示:

 

package TestThread.ThreadLockDemo;

import java.util.concurrent.locks.ReentrantLock;

public class TestLock {
	public static void main(String[] args) {
		ReentrantLock lock = new ReentrantLock();// 初始化lock对象
		Test2 test2 = new Test2("苹果", 100);// 初始化苹果的数量
		Test1 test1 = new Test1(lock, 10, test2);// 初始化线程对象
		Thread t1 = new Thread(test1, "线程1");// 创建线程
		Thread t2 = new Thread(test1, "线程2");
		Thread t3 = new Thread(test1, "线程3");
		t1.start();// 启动线程
		t2.start();
		t3.start();
	}
}

class Test1 implements Runnable {
	private int count;
	private ReentrantLock lock;
	private Test2 test2;

	public Test1(ReentrantLock lock, int count, Test2 test2) {
		this.lock = lock;
		this.count = count;
		this.test2 = test2;
	}

	@Override
	public void run() {
		if (lock.tryLock()) {
			// lock.lock();// 枷锁
			try {
				test2.DiscountApple(count);
			} catch (Exception e) {
				System.out.print("调用卖苹果的方法发生异常!");
			} finally {
				lock.unlock();// 解锁
			}
		} else {
			System.out.println(Thread.currentThread().getName() + "未获取到锁");
		}
	}
}

class Test2 {
	private String name;
	int count;

	/**
	 * @param name苹果的名字
	 * @param count初始化苹果的数量
	 */
	public Test2(String name, int count) {
		this.name = name;
		this.count = count;
	}

	/**
	 * * @author 作者 E-mail:
	 * 
	 * @date 创建时间:2017年3月24日 下午1:13:14
	 * @version 1.0
	 * @parameter
	 * @since
	 * @return
	 */
	public void DiscountApple(int discount) {
		this.count = this.count - discount;
		System.out.println(Thread.currentThread().getName() + ":苹果的数量为:" + this.count + ",卖掉了" + discount);
	}
}

测试结果为:

 

 

unlock()

posted on 2017-03-24 13:39  温柔的鲨鱼  阅读(2265)  评论(0编辑  收藏  举报

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