设计两个具体子类来继承抽象类，分别实现矩形和圆形的面积和周长的计算

设计两个具体子类来继承抽象类，分别实现矩形和圆形的面积和周长的计算
图形：Shape
计算面积：calculateArea
计算周长：calculatePerimeter
矩形：Rectangle 宽：width 高：height
圆形：Shape 半径：radius

public class Circle extends Shape{

//属性半径
private double radius;


public Circle() {
    this.radius =radius;
}



@Override
public double calculateArea() {
    return Math.PI*radius*radius;
}

@Override
public double calculatePerimeter() {
    return 2*Math.PI*radius;
}

public double getRadius() {
    return radius;
}

public void setRadius(double radius) {
    this.radius = radius;
}

}

//定义矩形类继承形状属性
public class Rectangle extends Shape{
//宽属性
private double width;
//高属性
private double height;

public Rectangle(double width, double height) {
    this.width = width;
    this.height = height;
}

//方法重写 面积
@Override
public double calculateArea() {
return widthheight;
}
//方法重写 周长
@Override
public double calculatePerimeter() {
return 2(width*height);
}

public double getWidth() {
    return width;
}

public void setWidth(double width) {
    this.width = width;
}

public double getHeight() {
    return height;
}

public void setHeight(double height) {
    this.height = height;
}

}

//形状 抽象类
public abstract class Shape {
//面积
public abstract double calculateArea();
//周长
public abstract double calculatePerimeter();

}