Dark Horse Programmer-Learning Diary (two types of singleton design patterns)

Singleton design pattern: Solve a class in memory only one object when multiple programs use a unified configuration information object, you need to ensure that the object is unique. Implementation of guaranteed Object uniqueness: 1. Privatize the constructor: to prevent other programs from building the object too much, prevent other programs from calling the object. 2. Create a class object in the class: For other programs to have access to the Class object 3. Provides a way to get to the object's method: It is convenient for other programs to access the custom class object. (There are only two ways to access a class method, to create an object or to define it as a static method)

Dark Horse Programmer-Learning Diary (two types of singleton design patterns)