静态检测单例模式

调用静态内部类，同样是线程安全的，原理同饿汉式单例

package org.study.singleton;

/**
 * 静态检测单例模式
 *
 *
 */
public class StaticCheckSingleton {

    private static class LazyHolder {
        private static final StaticCheckSingleton INSTANCE = new StaticCheckSingleton();
    }

    private StaticCheckSingleton(){};

    private static final StaticCheckSingleton getInstance() {
        return LazyHolder.INSTANCE;
    }

}