cylinder.java

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// Cylinder.java: 圆柱体扩展类Circle 

class Cylinder extends Circle
{
  private double length;

  // Default constructor
  public Cylinder()
  {
    super();
    length = 1.0;
  }

  // Construct a cylinder with specified radius, and length
  public Cylinder(double r, double l)
  {
    super(r);
    length=l;
  }
  
  

  // Getter method for length
  public double getLength()
  {
    return length;
  }

  // Setter method for length
  public void setLength(double length)
  {
    this.length = length;
  }

  // Find cylinder surface area
  public double findArea()
  {
    return 2*super.findArea()+(2*getRadius()*Math.PI)*length;
  }

  // Find cylinder volume
  public double findVolume()
  {
    return super.findArea()*length;
  }

  

  // Override the toString() method defined in the Object class
  public String toString()
  {
    return "[Cylinder] radius = " + radius + " and length "
      + length;
  }
}