cylinder.java

这是一个对属性

package counttest;

public class Cylinder extends Circle {
  private double length;

  /** Construct a cylinder with default properties */
  public Cylinder() {
    this(1.0, 1.0);
  }

  /** Construct a cylinder with specified radius, and length */
  public Cylinder(double radius, double length) {

    this(radius, length, "white", false );
  }

  /** Construct a cylinder with specified radius, filled, color, and
     length
    */
  public Cylinder(double radius, double length,
    String color, boolean filled ) {
    super(radius, color, filled);
    this.length = length;
  }

  /** Return length */
  public double getLength() {
    return length;
  }

  /** Set a new length */
  public void setLength(double length) {
    this.length = length;
  }

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

  /** Return the volume of this cylinder */
  public double findVolume() {
    return super.findArea() * length;
  }

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