Design Pattern—Singleton

Singleton

public class textSingleton{public static void main(String[] args) {Singleton singleton=Singleton.getInstance();Singleton singleton2=Singleton.getInstance();Singleton singleton3=Singleton.getInstance();System.out.println(singleton==singleton2);System.out.println(singleton2==singleton3);}}class Singleton {private static Singleton singleton;private Singleton(){}public static Singleton getInstance(){if(singleton==null){singleton=new Singleton();}return singleton;}}

Console Display:

true

true