java/w4/Circle.java

package com.rental.shape;

public class Circle extends Shape {
    
    private double radius;
    
    public Circle(double radius) {
        super("圆");
        this.radius = radius;
    }
    
    public double getRadius() {
        return radius;
    }
    
    public void setRadius(double radius) {
        this.radius = radius;
    }
    
    @Override
    public double getArea() {
        return Math.PI * radius * radius;
    }
}