Java Learning-Interface usage Method 2 (inter-interface polymorphism)

1 //There is also polymorphism between the interface and the specific implementation class2  Public classTestInterface {3     4      Public Static voidMain (string[] args) {5Duck d =NewDuck ();6 Testinterface.test1 (d);7 Testinterface.test2 (d);8 Testinterface.test3 (d);9     }Ten      One      Public Static voidTest1 (Runner R) {//Runner r = new Duck (); AR.run ();//virtual method Invocation -     } -      Public Static voidTest2 (Swimmer s) {//Swimmer s = new Duck (); the S.swim (); -     } -      Public Static voidTest3 (flier f) {//flier F = new Duck (); - f.fly (); +     } - } +  A Interfacerunner{ at      Public Abstract voidrun (); - } - Interfaceswimmer{ -     voidswim (); - } - Interfaceflier{ in     voidfly (); - } to  + classDuckImplementsrunner,swimmer,flier{ -  the @Override *      Public voidFly () { $System.out.println ("Ugly duckling can also become a white swan!") ");Panax Notoginseng     } -  the @Override +      Public voidswim () { ASystem.out.println ("Red Palm dial Clear Wave"); the     } +  - @Override $      Public voidrun () { $System.out.println ("The duck's hip twist Walk"); -     } -      the}

Java Learning-Interface usage Method 2 (inter-interface polymorphism)