light.java

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

  /** Whether the Light is on. */
  private boolean on;

  /** A Light is off by default. */
  public Light() {
    on = false;
  }

  /** Return true if the Light is on. */
  public boolean isOn() {
    return on;
  }

  /** Set whether the Light is on. */
  public void setOn(boolean on) {
	this.on = on;
  }

  public String toString() {
    if (on) {
      return "O";
    } else {
      return ".";
    }
  }

}