Simple Engineering Mode

Simple Factory mode

definition : specifically defines a class to be responsible for creating instances of other classes, and the instances that are created usually have a common parent class or interface;

intention : To provide a class, which is responsible for creating an instance of a specific class according to certain conditions;

1  Public classfactorydemo{2      Public Static voidMain (String []args) {3Ifruit fruit = factory.getfruit ("Orange");4         if(fruit!=NULL){5 System.out.println (Fruit.get ());6         }7         Else{8System.out.println ("What you want is not there."));9         }Ten     } One } A  - Interfaceifruit{ -      PublicString get (); the } -  - classfactory{ -      Public Staticifruit getfruit (String name) { +         if(Name.equals ("Apple"))) -         { +              return NewApple (); A         } at         Else if(Name.equals ("Orange")) -         { -              return NewOrange (); -         } -         Else -         { in             return NULL; -         } to     } + } -  the classAppleImplementsifruit{ *      PublicString Get () { $         return"Picking apples";Panax Notoginseng     } - } the  + classOrangeImplementsifruit{ A      PublicString Get () { the         return"Picking oranges"; +     } -}

Simple Engineering Mode