java抽象类和接口类例子

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1、Java作业抽象类：已知电流和电阻，计算电压和电功率。1、packageJavawork;publicabstractclassPhysical{publicabstractdoublefn1();publicabstractdoublefn2();}2、packageJavawork;publicclassPhysicalEquationextendsPhysical{publicdoubleI;//电流publicdoubleR;//电阻publicPhysicalEquation(doublea,doubleb){I=a;R=b;}@Over

2、ridepublicdoublefn1(){returnI*R;}@Overridepublicdoublefn2(){returnI*I*R;}}3、packageJavawork;publicclassAppPyhsical{/***@paramargs*/publicstaticvoidmain(String[]args){PhysicalobjP;PhysicalEquationobjPH=newPhysicalEquation(2,3.5);objP=objPH;System.out.println("电压："+objP.fn1())

3、;System.out.println("电功率："+objP.fn2());}}接口类：年龄。1、packageJavawork;publicinterfacePerson{publicdoubleAge();}2、packageJavawork;publicclassAgeimplementsPerson{doublea;publicchar[]Age;publicAge(){};publicdoubleAge(){return18;}}3、packageJavawork;publicclassAppPerson{/***@paramarg

4、s*/publicstaticvoidmain(String[]args){PersonobjP;AgeobjA=newAge();objP=objA;System.out.println("年龄：");System.out.println(+objP.Age());}}