单例模式之饿汉懒汉模式

1 饿汉模式

/** * 单例模式 1 饿汉模式 * @author hlantian * */public class Singleton {private static final Singleton sl = new Singleton();private Singleton() {}public static Singleton getInstance() {return sl;}}

 

2 懒汉模式

/** * 单例模式2 懒汉模式 * @author hlantian * */public class Singleton2 {private static Singleton2 instance = null;private Singleton2() {}public static Singleton2 getInstance() {if(instance == null) {instance = new Singleton2();}return instance;}}