agregarAlumno()

public boolean agregarAlumno( Alumno alumno )
    {
        for( int i = 0; i < this.alumnos.length; i++ ) {
            if( this.alumnos[i] == null )
            {
                this.alumnos[i] = alumno;
                return true;
            }
        }

        return false;
    }