Several simple design patterns of Java

"Singleton Mode"

The primary purpose of the singleton design pattern is to have only one instance of the class present in the entire system. such as global configuration information, a factory, or a master control class

 Public class Singleton {   privatestaticnew  Singleton;            Private Singleton () {}     Public Static Singleton getinstance () {        return  Singleton;   }    }

"Factory mode"

Three elements: interfaces, classes that implement interfaces, factory classes

InterfaceCar { Public voidrun ();  Public voidstop ();}classBenzImplementsCar { Public voidrun () {System.out.println ("Benz started----------------."); }     Public voidStop () {System.out.println ("Benz stopped----------------."); }  }classFordImplementsCar { Public voidrun () {System.out.println ("Ford starts----------------."); }     Public voidStop () {System.out.println ("Ford stopped----------------."); }  }classFactory { Public Staticcar getcarinstance (String type) {car car=NULL; Try{car= (Car) class.forname ("package.") +type). newinstance (); } Catch(Exception e) {e.printstacktrace (); }    }}            

Several simple design patterns for Java