How to record a student’s grades using the List array

Question

I need to add notes to certain students (each student has several grades and each grade belongs to a discipline), but as I am using Ist arrayand have little knowledge in java I am well lost in passing parameters and how to add new values using the function registrarNota.

Could someone explain what I should do.

PS(I cannot use Extends)

Student class:

package auladia24;

import java.util.ArrayList;

public class Aluno {
    private String nome;
    private String ra;
    private ArrayList<Nota> notas = new ArrayList(); // tipo da array e o nome da array

    public Aluno(String nome, String ra){
        this.nome = nome;
        this.ra = ra;
    }

    public String getNome (){
        return this.nome;
    }

    public String getRa(){
        return this.ra;
    }

    public ArrayList getNotas(){
        return this.notas;
    }

    public Nota registrarNota(double valor, Disciplina nomeDisciplina){

    }
}

Class Note:

package auladia24;

public class Nota {
    private double valor ;
    private Disciplina nomeDisciplica;

    public void  nota (double nota, Disciplina nomeDisciplina){
        this.valor = valor;    
        this.nomeDisciplica = nomeDisciplica;
    }

    public double getNota(){
        return this.valor;
    }

    public Disciplina getDisciplina(){
        return this.nomeDisciplica;
    }

}

Classe Disciplina:

package auladia24;

public class Disciplina {
    private String nome;

    public Disciplina (String nome){
        this.nome = nome;
    }

    public String getNome(){
        return this.nome;
    }
}

Answer 1

From what I understand you need to use the method registrarNota right? He asks for a double and an object Discipline.

public Nota registrarNota(double valor, Disciplina nomeDisciplina)
{
    //primeiro checa se ja existe a nota
    for(Nota n : notas)
    { 
        if(n.getDisciplina().getNome().equals(objetoDisciplina.getNome()))
        {
            n.setNota(valor); 
            return n;
        }
    }
    Nota n = new Nota(valor, nomeDisciplina); //cria a nova nota
    notas.add(n); //adiciona ela no arraylist
    return n; //retorna a nota criada
}

It is necessary to add the method setNota in class Nota

public void setNota(double valor)
{
    this.valor = valor
}

To call her would simply be aluno.registrarNota(nota, objetoDisciplina);