Area of circle, perimeter, volume of cylinder (class encapsulation and abstraction)

import java.util.Scanner;
public class Circle {
private double radius;//Used to store the radius of the circle;

public Circle ()// Set the radius to 0
{
radius = 0;
}

public Circle (double r){// When creating a Circle object, initialize the radius to r.
radius = r;
}

public Double getArea()//Get the area of ​​the circle
{
return radius*radius*Math.PI;
}

public Double getPerimeter() //Get the circumference of the circle
{
return 2*Math.PI*radius;
}

public void disp() //Output the radius, perimeter and area of ​​the circle to the screen
{
System.out.printf("The radius of the circle is: %.2f, the circumference: % .2f, area: %.2f", radius, getPerimeter1(), getArea1());
}
public class Cylinder extends Circle {

 private double hight;

 

  public Cylinder (double r, double  h ){

   super(r);

   this.hight = h;

  }

  public double getVolume(){

   return Math.PI * this.getRadius() * this.getRadius() * hight;

  

  } 

  public void showVolume( ){

   System.out.println("圆柱体的体积：" + this.getVolume());

  }

}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("输入半径：");
double r = s.nextDouble();
Circle c = new Circle(r);
c.disp();

}

}