关于javascript:前端工程化概述

System.out.println("instance.hashCode=" + instance.hashCode());//1163157884System.out.println("instance1.hashCode=" + instance1.hashCode());//1163157884
}}
//饿汉式(动态变量)
class Singleton {//1. 私有化结构器，内部不能能new
private Singleton() {}//2. 在本类外部创建对象实例
private final static Singleton instance = new Singleton();//3. 提供一个共有的静态方法，返回实例对象
public static Singleton getInstance() {return instance;
}}
优缺点阐明长处；这种写法比较简单，就是再类装载的时候就实现实例化。防止了线程同步问题。
毛病；再类装载的时候就实现实例化，没有达到Lazy Loading(懒加载)的成果。如果从始至终从未应用这个实例，则会造成内存的节约。这种办法基于classloder机制防止了多线程的同步问题，不过，instance再类装载时就实例化，再单例模式种大多数都是调用getInstance办法，然而导致类装载的起因有很多种，因而不能确定其余的形式(或者其余的静态方法)导致类装载，这时候初始化instance就没有达到lazy loading的成果
论断；这种单例模式可用，可能造成内存节约。饿汉式(动态代码块)
代码
public class SingletonTest2 {
public static void main(String[] args) {//测试
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