/**********************************************************
 * Should really be abstract!
 **********************************************************/
public class Instrument
{
    public void play()
    {
        System.out.println("beep beep.");
    }
       
}


/**********************************************************
 **********************************************************/
public class Harmonica extends Instrument
{
    
    public void play()
    {
        System.out.println("waah waah.");
    }

}

/**********************************************************
 **********************************************************/
public class Violin extends Instrument
{

    public void play()
    {
        System.out.println("fiddle fiddle.");
    }
    
    public void pluck()
    {
        System.out.println("plink plink.");
    }
}