定義一個父矩形,子長方體並繼承

code

package javahomework;

public class HW14 {

 class Rectangle {
  private double length1, length2;

  public Rectangle() {
   length1 = 1.0;
   length2 = 1.0;
  }

  public Rectangle(double n) {
   length1 = n;
   length2 = n;
  }

  public Rectangle(double n1, double n2) {
   length1 = n1;
   length2 = n2;
  }

  public void set(double n1, double n2) {
   length1 = n1;
   length2 = n2;
  }

  public double getL1() {
   return length1;
  }

  public double getL2() {
   return length2;
  }

  public double findArea() {
   return length1 * length2;
  }

  public double find4Length() {
   return (length1 + length2) * 2;
  }
 }

 class AdRectangle extends Rectangle {
  private double hight;

  AdRectangle() {
   hight = 1.0;
  }

  AdRectangle(double n1, double n2, double n3) {
   super(n1, n2);
   hight = n3;
  }

  public void set(double n1, double n2, double n3) {
   super.set(n1, n2);
   hight = n3;
  }

  public double findVolume() {
   return super.findArea() * hight;
  }

  public double findArea() {
   return super.getL1() * super.getL2();
  }

  public double findFaceArea() {
   return super.findArea() * 2 + super.getL1() * hight * 2
     + super.getL2() * hight * 2;
  }
 }
}