class Droid {

  // Create a Droid that is activated, charged, and can hover.
  int batteryLevel;

  public Droid() {

    batteryLevel = 100;
  }

  public void activate() {

    System.out.println("Activated.  How can I help you?");
    batteryLevel = (batteryLevel - 5);
    System.out.println("Battery level is " + batteryLevel + " percent.");

  }

  public void chargeBattery(int hours) {

    System.out.println("Droid charging...");
    batteryLevel = (batteryLevel + hours);
    if (batteryLevel > 100) {

      batteryLevel = 100;
      System.out.println("Battery level is " + batteryLevel + " percent.");

    } else {

      System.out.println("Battery level is " + batteryLevel + " percent.");

    }

  }

  public int checkBatteryLevel() {

    System.out.println("Battery level is " + batteryLevel + " percent.");
    return batteryLevel;

  }

  public void hover(int feet) {

    if (feet > 2) {

      System.out.println("Error!  I cannot hover above 2 feet.");

    } else {

      System.out.println("Hovering...");
      batteryLevel = (batteryLevel - 20);
      System.out.println("Battery level is " + batteryLevel + " percent.");
    }

  }



  public static void main(String[] args) {

    Droid myDroid = new Droid();
    myDroid.activate();
    myDroid.chargeBattery(5);
    myDroid.hover(1);

  }

}