关于javascript:deeplabV3布置笔记逢山开路遇水搭桥篇

单例设计模式有八种写法
饿汉式 (动态常量) 饿汉式 (动态代码块)
懒汉式 (线程不平安) 懒汉式 (线程平安，同步办法)
懒汉式 (线程平安，同步代码块) 双重查看
动态外部类枚举
饿汉式 (动态常量)
步骤如下:
结构器私有化 (避免 new)
类的外部创建对象
向外裸露一个动态的公共办法。gentInstance
代码实现
public class SingletonTest1 {public static void main(String[] args) {
// 测试 Singleton instance = Singleton.getInstance();
Singleton instance1 = Singleton.getInstance();System.out.println(instance == instance1);//true
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