public abstract class Portable extends Technology
{

  public int battery;

  public Portable()
  {
    battery = (int) ( Math.random()*100+0 );
  }

  public int battery()
  {
    return battery;
  }

  public void charge()
  {
    battery = 100;
    System.out.println("Your device's battery has been recharged to " + battery + "%");
  }

  public void charge(int percent)
  {
    if (battery < percent)
    {
      battery = percent;
      System.out.println("Your device's battery has been recharged to " + battery + "%");
    }
    else
      System.out.println("The battery is already at this level.");
  }

}