A hungry man mode of single case mode

Package Com.imooc;/** Single case Mode singleton * Application: Some objects need only one is enough. * Function: Ensure that an instance of the entire application has only one * type: A hungry man mode, lazy mode * **/Public class Singleton {//1. Privatize the construction method and do not allow external direct creation of objectsPrivate Singleton () {}//2. Create a unique instance of the class, using the private static adornmentprivate static Singleton instance=NewSingleton (); //3. Provide a method for obtaining an instance, using the public static modifierPublic static Singleton getinstance () {returninstance; }}

Usage patterns

Package Com.imooc;public class Test {    void  main (string[] args) {        Singleton s1=  Singleton.getinstance ();        Singleton s2=singleton.getinstance ();         if (s1==S2)        {            System.out.println ("S1 and sI2 are the same instance");        } Else {                        System.out.println ("S1 and time is not the same instance")        ;     }}}

A hungry man mode of single case mode