多线程----wait/notify

线程同步：两个线程依次对同一变量进行操作。

package com.thread.waitNotify;

/**
 * 线程一对变量加1，线程二对该变量减1，如此循环下去
 * 
 * @author yangjianzhou
 * @description TODO
 * @time Nov 6, 2014 : 9:39:53 PM
 */
public class ThreadTest1 {

	public static void main(String[] args) {
		final AssistClass assist = new AssistClass();
		new Thread(new Runnable() {
			@Override
			public void run() {
				while (true) {
					assist.plus();
				}
			}
		}).start();

		new Thread(new Runnable() {
			@Override
			public void run() {
				while (true) {
					assist.minus();
				}
			}
		}).start();
	}
}

class AssistClass {
	boolean runPlus = true;
	
	private int amount;
    /**
     * execute ++amount ,then print the field
     */
	public synchronized void plus() {
		if (!runPlus) {
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}

		System.out.println("plus method : amount = " + (++amount));
		runPlus = false;
		this.notify();
	}

    /**
     * execute --amount ,then print the field
     */
	public synchronized void minus() {
		if (runPlus) {
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println("minus method : amount = " + (--amount));
		runPlus = true;
		this.notify();
	}

}

运行结果：

plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0
plus method : amount = 1
minus method : amount = 0