weixin_42246923的博客

目录懒汉式懒汉式线程不安全的单例模式public class Singleton { private static Singleton instance = null; private Singleton() { } public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } return instance; }.

参考文献https://www.cnblogs.com/kubixuesheng/p/5155644.htmlhttps://www.cnblogs.com/java-my-life/archive/2012/05/10/2491891.html