coloredlight.java

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// Introduced in Chapter 3
/** A colored light bulb. */
public class ColoredLight extends Light {

  /** Color of the ColoredLight. */
  private char color;

  /** Set the color randomly to one of 'R', 'G', or 'B'. */
  public ColoredLight() {
    super();
    int x = (int)(Math.random() * 3);
    switch (x) {
      case 0:
        color = 'R';
        break;
      case 1:
        color = 'G';
        break;
      default:
        color = 'B';
    }
  }
  
  /** Return the color of this ColoredLight. */
  public char getColor() {
    return color;
  }
  
  public String toString() {
    if (isOn()) {
      return "" + color;
    } else {
      return ".";
    }
  }

}