饿汉式(推荐)
- 声明静态成员变量
- 构造器私有化(防止new)
- 向外暴露静态的公共方法
缺点：可能造成内存浪费
饿汉式静态代码块
- 构造器私有化(防止new)
- 声明创建类的变量
- 静态代码块中进行赋值
- 向外暴露静态的公共方法
缺点：可能造成内存浪费
懒汉式
- 私有化构造器
- 提供静态变量
- 公共方法双重检查（第二重加锁检查）
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