Java多线程之线程并发库的线程锁技术

Lock比传统线程模型中的Synchronied方式更加面向对象,与生活中的锁类似,锁本身也应该是一个对象.两个线程执行的代码段要实现同步互斥的效果,它们必须用同一个Lock对象,锁是在代表要操作的资源的类的内部方法中,而不是线程代码中.

Lock就用来替代synchronized的

 

package javaplay.thread.test;

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

public class LockTest {

	public static void main(String[] args) {
		new LockTest().init();
	}

	private void init() {
		final Outputer outputer = new Outputer();
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					outputer.output("zhangxiaoxiang");
				}
			}

		}).start();

		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					outputer.output("liheming");
				}
			}

		}).start();
	}

	static class Outputer {
		// ctrl+t查看接口有哪些实现类
		Lock lock = new ReentrantLock();

		public void output(String name) {
			int len = name.length();
			lock.lock();
			try {
				for (int i = 0; i < len; i++) {
					System.out.print(name.charAt(i));
				}
				System.out.println();
			} finally {// 防止抛异常时不能释放锁
				lock.unlock();
			}

		}

	}

}