单例模式

//单例模式：懒汉模式package com.mo.test;public class MyBean {private static MyBean instance = null;private MyBean(){//do something}public static synchronized MyBean getInstance(){if(instance == null){instance = new MyBean();}return instance;}}//单例模式：饿汉模式public class MyBean{    public static final MyBean instance = new MyBean();private MyBean(){};public static MyBean getInstance(){     return instance;}}