java防止主线程退出

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不要用while(true)防止主线程退出，会导致cpu占用变高。阿里开源RPC框架dubbo中找到了答案。

https://github.com/apache/dubbo/blob/2d9583adf26a2d8bd6fb646243a9fe80a77e65d5/dubbo-container/dubbo-container-api/src/main/java/org/apache/dubbo/container/Main.java

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package com.me;

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

public class Test {

    private static final ReentrantLock LOCK = new ReentrantLock();
    private static final Condition STOP = LOCK.newCondition();

    public static void main(String[] args) {
        System.out.println("do not exit");
        //主线程阻塞等待，守护线程释放锁后退出
        try {
            LOCK.lock();
            STOP.await();
        } catch (InterruptedException e) {
            System.out.println(e.toString());
        } finally {
            LOCK.unlock();
        }
    }
}