A singleton design pattern in Java

Design patterns are reusable solutions that have been proposed by 4 authors, called "GoF", also known as quad groups.

The design pattern is divided into: creation type, structure type, behavior type

The singleton design pattern belongs to the creation type

The three elements of a singleton pattern:

1. Variables of this type that need to have static private in the class body

2. The construction method must be private

3. Provide a public static entry point method

Lazy-public class singleton{    private static singleton st;// Think about why it's static?     private singleton () {        }     public static singleton getinstance () {         if (st==null) {            st = new  singleton ();        }         return st;    }}//a hungry man type public class singleton{     Private static singleton st=new singleton ();//Think about why it's static?     private singleton () {        }     public static singleton getinstance () {         return st;    }} 

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A singleton design pattern in Java