cylinder9.java

java课件

public class Cylinder9 extends Circle9 {
  private double length;

  /** Construct a cylinder with default properties */
  public Cylinder9() {
    this(1.0, 1.0);
  }

  /** Construct a cylinder with specified radius, and length */
  public Cylinder9(double radius, double length) {
    this(radius, "white", false, length);
  }

  /** Construct a cylinder with specified radius, filled, color, and
     length
    */
  public Cylinder9(double radius,
    String color, boolean filled, double length) {
    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;
  }
}