Several implementation methods of Java singleton pattern

Singleton pattern is a design pattern used to ensure that a class has only one instance and provides a global access point. In Java, there are several common ways to implement the singleton pattern. These methods are described in detail below and corresponding source code examples are provided.

1. Lazy Initialization
   Lazy Initialization is one of the simplest ways to implement the singleton pattern. It delays instantiating an object until it is first used. The following is the lazy implementation code:

public class LazySingleton {
   
    
    
    private static LazySingleton instance;

    private LazySingleton() {
   
    
    
        // 私有构造函数
    }