java单例模式多线程测试

package com.github.pig.auth;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class Test {
private static class Inner {
private static Test t = new Test();
}
Test() {
System.out.println(this.hashCode());
}
private static Test t;
public static Test getSignle() {
try {
latch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
if(t == null) {
synchronized (Test.class) {
if (t == null) {
t = new Test();
}
}
}
return t;
}
static CountDownLatch latch = new CountDownLatch(100);
public static void main(String[] args) {
for (int i = 0; i < 100; i++) {
Thread th = new Thread(Test::getSignle);
th.start();
latch.countDown();
}
}
}

运行结果打印一个就对了

上面例子是最好的单例模式两种，都是懒加载，只会创建一次。

双重锁 ，内部类

最后

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