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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、package Javawork;public abstract class Physical public abstract double fn1();public abstract double fn2();2、package Javawork;public class PhysicalEquation extends Physical public double I;/电流public double R;/ 电阻public PhysicalEquation(double a,double b) I=a;R=b;Override
2、public double fn1() return I*R;Overridepublic double fn2() return I*I*R;3、package Javawork;public class AppPyhsical /* * param args */public static void main(String args) Physical objP;PhysicalEquation objPH=new PhysicalEquation(2,3.5);objP=objPH;System.out.println(电压：n+objP.fn1();System.out.println
3、(电功率：n+objP.fn2();接口类：年龄。1、package Javawork;public interface Person public double Age();2、package Javawork;public class Age implements Person double a;public char Age; public Age(); public double Age() return 18; 3、package Javawork;public class AppPerson /* * param args */public static void main(String args) Person objP;Age objA=new Age();objP=objA;System.out.println(年龄：);System.out.println(+objP.Age();