/** Illustrates enumerations. 
*/
public class Colors {

  /** 
     A Color type 
  */
  public enum Color {Red, Green, Blue};
 
  /** 
     Construct a Color object
  */
  public Colors(Color c) {
   myColor = c;
  }
 
  /** 
     Returns the object's color
  */
  public Color getColor() {
    return myColor;
  }

  /** 
      Sets the object's color.
      @param c The color to save
  */
  public void setColor(Color c) {
    myColor = c;
  }

  /** 
      Changes the object color to the next in the enumeration sequence.

  */
  public void rotateColor() {
    switch (myColor) {
      case Red:   myColor = Color.Green; break;
      case Green: myColor = Color.Blue; break;
      case Blue:  myColor = Color.Red; break;
   }
  }

  /** 
      Changes the object's color to the previous in the enumeration 
      sequence.
  */
  public void rotateBackColor() {
    myColor = Color.values()[(myColor.ordinal() -1+3) % 3];
  }
  
  /** 
      Holds the object's color
  */
  private Color myColor;
}