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obsidian-sync/日常学习/设计模式/单例.md

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介绍

单例模式主要解决的是，一个全局使用的类频繁的创建和消费，从而提升整体的代码性能

  • 数据库连接池
  • spring bean单例
  • 代码中的全局属性保存

代码例子

内部类单例 !Snipaste_2023-02-12_13-54-33.png

枚举单例 !Snipaste_2023-02-12_13-54-57.png