gistfile1.txt

public class lightbulb {

  // light level is 0 to 10 where 0 is off and 10 is full brightness
  private int dimmerLevel;

  public lightbulb() {
     dimmerLevel = 0;   // initialize the light as "off"
  }

  // set the light bulb brightness to a new level
  public setDimmer(int dimmerLevel) {
    if (dimmerLevel >= 0 && dimmerLevel <= 10) {
      this.dimmerLevel = dimmerLevel;
    } else {
      throw new IllegalArgumentException("Invalid dimmer level!");
    }
  }

  // get how bright the light is
  public getBrightness() {
    return dimmerLevel;
  }
  
  // check if the light is on
  public isOn() {
    if (dimmerLevel > 0) {
      return true;
    } else {
      return false;
    }
  }
}