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package jichuti;
/**
* 正方形类（实现Shape接口）
*/
* 圆形类（辅助测试，实现Shape接口）
public class Circle implements Shape, tiaozhanti.Shape {
private String color; // 颜色
private double radius; // 半径
public Circle(String color, double radius) {
this.color = color;
this.radius = radius;
}
@Override
public String getColor() {
return color;
public double getArea() {
return Math.PI * radius * radius; // 圆形面积=πr²
public double getRadius() { return radius; }
