public Schijf(char letter, int rij, int kolom)
    {
    	if (letter == 'z' || letter == 'Z') 
    	{
    		kleur = 'z';
    	}
    	else if (letter == 'w' || letter == 'W')
    	{
    		kleur = 'w';
    	}
    	else {
    		// foutieve waarde!!
    	}
    	
    	if (letter == 'Z' || letter == 'W')
    	{
    		dam = true;
    	}
    	else {
    		dam = false;
    	}
    	
    	this.rij = rij;
    	this.kolom = kolom;
    }