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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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