Class doubt

[Wryfyng]

Hello, could anyone hep me with this code? I don't get why the 5th line in the second code does not work. thanks for your time

public class Grupo {
	private int id;
	private char dia;
	private String hora;
	public Grupo(){}
	public Grupo(String[] campos){
		this.id=Integer.parseInt(campos[0]);
		this.dia=campos[1].charAt(0);
		this.hora=campos[2];
	}
}

public class MateriaGrupo {
	private Grupo grupo;
	public MateriaGrupo(){}
	public MateriaGrupo(String[] campos){
		this.grupo=new Grupo(campos[]); //this line does not work
	}
}

[Wryfyng]

ok, solved, i dont have to put the brackets. sorry