定义一个圆类Circle，成员变量：半径 radius；成员方法：构造方法、get和set半径的方法、计算面积和周长的方法。定义圆柱和圆锥类，定义相应的变量成员和成员方法

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定义一个圆类Circle，成员变量：半径 radius；成员方法：构造方法、get和set半径的方法、计算面积和周长的方法。定义圆柱和圆锥类，定义相应的变量成员和成员方法。使用以上类编程，输出圆柱和圆锥面积和体积

public class Circle {
    public double radius;
    public double pai = 3.14;
 
    public double getRadius() {
        return radius;
    }
 
    public void setRadius(double radius) {
        this.radius = radius;
    }
 
    public Circle(double radius) {
        this.radius = radius;
    }
 
    public Circle() {
 
    }
 
    public double Perimeter() {
        return 2 * pai * radius;
    }
 
    public double Area() {
        return pai * (radius * radius);
    }
}
public class Cylinder {
    private double width;
    private double height;
    private Circle circle;
 
    public double getWidth() {
        return width;
    }
 
    public void setWidth(double width) {
        this.width = width;
        circle = new Circle(width / 2);
    }
 
    public double getHeight() {
        return height;
    }
 
    public void setHeight(double height) {
        this.height = height;
    }
 
    public Cylinder(double width, double height) {
        this.width = width;
        this.height = height;
        circle = new Circle(width / 2);
    }
 
    public Cylinder() {
    }
 

    public double calculSideArea() {
        return circle.Perimeter() * height;
    }
 
    public double calculSurfaceArea() {
        return (calculSideArea() + circle.Area()) * 2;
    }
 
    public double calculVolume() {
        return circle.Area() * height;
    }
}
public class Cone {
    private double width;
    private double height;
    private Circle circle;
 
    public double getWidth() {
        return width;
    }
 
    public void setWidth(double width) {
        this.width = width;
        circle = new Circle(width / 2);
    }
 
    public double getHeight() {
        return height;
    }
 
    public void setHeight(double height) {
        this.height = height;
    }
 
    public Cone(double width, double height) {
        this.width = width;
        this.height = height;
        circle = new Circle(width / 2);
    }
 
    public Cone() {
 
}

    public double calculSideBusLine() {
        return Math.sqrt(circle.radius * circle.radius + height * height);
    }
 
    public double calculSideArea() {
        return circle.pai * circle.radius * calculSideBusLine();
    }
 
    public double calculSurfaceArea() {
        return circle.pai * circle.radius * (calculSideBusLine() + circle.radius);
    }
 
    public double calculVolume() {
        return circle.pai * (circle.radius * circle.radius) * height / 3;
    }
 
}
public class Test {

	public static void main(String[] args) {
		double radius = 1.5;
        double width = radius * 2;
        double height = 8;
         
        Circle circle = new Circle(radius);
        System.out.println("圆形周长："+String.format("%.2f",circle.Perimeter()));
        System.out.println("圆形面积："+String.format("%.2f",circle.Area()));
         
        Cylinder cylinder = new Cylinder(width, height);
        System.out.println("圆柱体侧面积："+String.format("%.2f",cylinder.calculSideArea()));
        System.out.println("圆柱体面积："+String.format("%.2f",cylinder.calculSurfaceArea()));
        System.out.println("圆柱体体积："+String.format("%.2f",cylinder.calculVolume()));
        
        Cone cone = new Cone(width, height);
        System.out.println("圆锥体体侧面积："+String.format("%.2f",cone.calculSideArea()));
        System.out.println("圆锥体面积："+String.format("%.2f",cone.calculSurfaceArea()));
        System.out.println("圆锥体体积："+String.format("%.2f",cone.calculVolume()));
    } 

}

运行结果如下：

以上代码经过测试，可以放心使用