Will point mode, to have bigger picture ~ ~ ~

The general principle is that, like transformers, each component is split into exactly the right business.

It's too thin to be lost.

The coupling is too strong, will not adapt to change ~ ~

Miniducksimulator.java

Abstract classDuck {Flybehavior flybehavior;    Quackbehavior Quackbehavior;  Public Abstract voiddisplay ();  Public voidPerformfly () {flybehavior.fly (); }         Public voidPerformquack () {quackbehavior.quack (); }     Public voidswim () {System.out.println ("All duck float, even decoys!"); }         Public voidSetflybehavior (Flybehavior fb) {Flybehavior=FB; }     Public voidSetquackbehavior (Quackbehavior QB) {Quackbehavior=QB; }}Interfaceflybehavior{ Public voidfly ();}classFlywithwingsImplementsFlybehavior { Public voidFly () {System.out.println ("I ' m flying!"); }}classFlynowayImplementsFlybehavior { Public voidFly () {System.out.println ("I can ' t fly!"); }}classFlyrocketpoweredImplementsFlybehavior { Public voidFly () {System.out.println ("I ' m flying with a rocket!"); }}InterfaceQuackbehavior { Public voidquack ();}classQuackImplementsQuackbehavior { Public voidQuack () {System.out.println ("Quack"); }}classMutequackImplementsQuackbehavior { Public voidQuack () {System.out.println ("<< Silence >>"); }}classSqueakImplementsQuackbehavior { Public voidQuack () {System.out.println ("Squeak"); }}classMallardduckextendsDuck { PublicMallardduck () {Quackbehavior=NewQuack (); Flybehavior=Newflywithwings (); }     Public voiddisplay () {System.out.println ("I ' m a real mallard duck"); }}classModelduckextendsDuck { PublicModelduck () {Flybehavior=NewFlynoway (); Quackbehavior=NewQuack (); }     Public voiddisplay () {System.out.println ("I ' m a model duck!"); }} Public classMiniducksimulator { Public Static voidMain (string[] args) {//TODO auto-generated Method StubDuck Mallard =NewMallardduck ();        Mallard.performquack ();        Mallard.performfly ();                Mallard.swim (); Duck Model=NewModelduck ();        Model.performfly (); Model.setflybehavior (Newflyrocketpowered ());    Model.performfly (); }}

Quack
I ' m flying!
All duck float, even decoys!
I can ' t fly!
I ' m flying with a rocket!

Will point mode, to have bigger picture ~ ~ ~