代码详解の使用CountDownLatch解决面试问题：T1和T2线程执行计算，T3线程计算结果的统计

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package com.sdmjhca.springBootDemo.synchronizedtest;import java.util.concurrent.CountDownLatch;/** * 例子：T1和T2线程执行计算，T3线程进行T1和T2结果的统计 * 思路定义一个“锁计数器”为2的线程并发类，T3通过await方法进行锁等待，T1执行完成后计数器-1，T2完成后计数器-1； * 当计数器为0后，T3开始执行统计方法，得到最终计算结果 * @author JHMI on 2017/8/18. */public class SynchronizedMain {    private static CountDownLatch start = new CountDownLatch(1);    private static CountDownLatch end = new CountDownLatch(2);    private static int i = 1;    private static int j = 1;    public static void main(String args[]) throws InterruptedException {        Thread t1 = new Thread(new Runnable() {            @Override            public void run() {                try {                    start.await();                    System.out.println("T1开始执行");                    //SynchronizedTest.staticIn.method1();                    i++;                    //Thread.sleep(1000);                    end.countDown();                    System.out.println("T1计算结束");                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        });        Thread t2 = new Thread(new Runnable() {            @Override            public void run() {                try {                    start.await();                    System.out.println("T2开始执行");                   // SynchronizedTest.staticIn.method2();                    j++;                    //Thread.sleep(1000);                    end.countDown();                    System.out.println("T2执行结束");                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        });        Thread t3 = new Thread(new Runnable() {            @Override            public void run() {                try {                    start.await();                    System.out.println("T3开始执行，进入等待状态");                    end.await();                    System.out.println("获得锁 开始执行T3");                } catch (InterruptedException e) {                    e.printStackTrace();                }                //Thread.sleep(1000);                int c = i+j;                System.out.println("统计结果="+c);                System.out.println("T3执行结束");            }        });        t1.start();        t2.start();        t3.start();        start.countDown();       /* i = i+j;        System.out.println("i="+i);*/    }}
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