java课后作业

abstract class A{
public abstract void f(int x);
public abstract void g(int x,int y);
public abstract void h(double x);
}
class Length extends A{
public void f(int x){
System.out.println("这个长方体的长为12。");
}
public void g(int x,int y){}
public void h(double x){}
}
class Width extends A{
public void g(int x,int y){
System.out.println("这个长方体的宽为13.");
}
public void f(int x){}
public void h(double x){}
}
class Height extends A{
public void h(double x){
System.out.println("这个长方体的高为24.08.");
}
public void f(int x){}
public void g(int x,int y){}
}
public class Rectangle{
public static void main(String args[]){
A a;
a=new Length();
a.f(0);
a=new Width();
a.g(0,0);
a=new Height();
a.h(0);
}
}