单例设计模式的性能测验java

import java.util.concurrent.CountDownLatch;

public class TextTimeMinutesOfDemo {
    public static void main(String[] args) throws Exception{
        long start = System.currentTimeMillis();
        int threadCount = 10;

        final CountDownLatch countDownLatch = new CountDownLatch(threadCount);
        for (int i = 0;i<threadCount;i++){
            new Thread(new Runnable() {
                @Override
                public void run() {
                    for (int i=0;i<1000000;i++){
                        Object o = SingletonDemo01.getInstance();
                    }
                    countDownLatch.countDown();
                }
            }).start();
        }
        countDownLatch.await();
        long end = System.currentTimeMillis();
        System.out.println("运行时间为："+(end-start));
    }
}