问题：帮忙看一下这个编程题,谢谢
//Compute.java
public interface Compute {
double area();
}
//Shape.java
public abstract class Shape implements Compute{
}
//Circle.java
public class Circle extends Shape {
private double r;
public Circle(double r){
this.r = r;
}
public double area() {
return 3.14 * r * r;
}
}
//Square.java
public class Square extends Shape {
private double l;
public Square(double l){
this.l = l;
}
public double area() {
return l * l;
}
}
//Rectangle.java
public class Rectangle extends Shape {
private double h;
private double w;
public Rectangle(double h,double w){
this.h = h;
this.w = w;
}
public double area() {
return h * w;
}
}
//Tritangle.java
public class Tritangle extends Shape {
private double d;
private double h;
public Tritangle(double d,double h){
this.d = d;
this.h = h;
}
public double area() {
return d * h / 2;
}
}
//TestShape.java
public class TestShape {
public static void main(String[] args) {
Shape[] shape = {new Circle(3),new Square(4),new Rectangle(4,5),new Tritangle(4,3)};
double sumArea = 0;
System.out.println("这四个图形的面积分别为：");
for(int i = 0;i < shape.length;i ++){
double area = 0;
System.out.println(area = shape[i].area());
sumArea += area;
}
System.out.println("这四个图形的面积之和为：" + sumArea);
}
}
如果你对帮忙看一下这个编程题,谢谢这个问题有好的意见或
建议，请留言
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