inner_class and interface

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1、Chapter16Theinterface-athirdwaytosetupareuserelationshipTheinterfaceallowsyoutoperforma“multipleinheritance”InnerclasseslooklikeasimplecodehidingmechanismCancommunicatewiththesurroundingclassInterfaces&InnerClassesInterfacespureabstractclassfield:staticfinalestablishaprotocolbetweenclassMethod-nobod

2、yimportjava.util.*;interfaceInstrument{//Compile-timeconstant:inti=5;//static&finalCannothavemethoddefinitions:voidplay();//AutomaticallypublicStringwhat();voidadjust();}classWindimplementsInstrument{publicvoidplay(){System.out.println("Wind.play()");}publicStringwhat(){return"Wind";}publicvoidadjus

3、t(){}}classPercussionimplementsInstrument{publicvoidplay(){System.out.println("Percussion.play()");}publicStringwhat(){return"Percussion";}publicvoidadjust(){}}classStringedimplementsInstrument{publicvoidplay(){System.out.println("Stringed.play()");}publicStringwhat(){return"Stringed";}publicvoidadj

4、ust(){}}classBrassextendsWind{publicvoidplay(){System.out.println("Brass.play()");}publicvoidadjust(){System.out.println("Brass.adjust()");}}classWoodwindextendsWind{publicvoidplay(){System.out.println("Woodwind.play()");}publicStringwhat(){return"Woodwind";}}publicclassMusic5{//Doesn'tcareabouttype

5、,sonewtypes//addedtothesystemstillworkright:staticvoidtune(Instrumenti){i.play();}staticvoidtuneAll(Instrument[]e){for(inti=0;i

6、i++]=newStringed();orchestra[i++]=newBrass();orchestra[i++]=newWoodwind();tuneAll(orchestra);}}“Multipleinheritance”inJavapureabstractclassimportjava.util.*;interfaceCanFight{voidfight();}interfaceCanSwim{voidswim();}interfaceCanFly{voidfly();}classActionCharacter{publicvoidfight(){}}classHeroextend

7、sActionCharacterimplementsCanFight,CanSwim,CanFly{publicvoidswim(){}publicvoidfly(){}}publicclassAdventure{staticvoidt(CanFightx){x.fight();}staticvoidu(CanSwimx){x.swim();}staticvoidv(CanFlyx){x.fly(