Single Case design mode

1 //a hungry man single-case design mode----> guarantee only one object in memory. 2 classsingle{3 4     //declare a reference type variable of this class, and use that variable to point to the class object5     Private StaticSingle S =NewSingle ();6 7     //Privatization Constructors8     PrivateSingle () {}9 Ten     //provides a public static way to get objects of this class One      Public    StaticSingle getinstance () { A         returns; -     } -}

//Lazy One-case design mode----> Guarantee single is only one object in memory. classsingle2{//declares a reference type variable of this class and does not create objects of this class    Private StaticSingle2 S; //privatized the constructor    PrivateSingle2 () {}//     Public StaticSingle2 getinstance () {if(s==NULL) {s=NewSingle2 (); }        returns; }}

Single Case design mode