J260713/授课代码/c260723/src/exercise/exercise02/Circle.java

package exercise.exercise02;


/**
 * @author WanJl
 * @version 1.0
 * @title Circle
 * @description 圆形类
 * @create 2026/7/23
 */
public class Circle extends Shape{
    private double radius;
    private double pi=3.1415926;

    public Circle(String color, double radius) {
        super(color);   //调用父类的构造方法
        this.radius = radius;   //为自己的私有变量传值
    }

    /**
     * 计算面积
     *
     * @return
     */
    @Override
    public double getArea() {
        return pi*radius*radius;
    }

    /**
     * 计算周长
     *
     * @return
     */
    @Override
    public double getPerimeter() {
        return 2*pi*radius;
    }
}