Doubt about sum of information

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Doubt about sum of information

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I'm doing exercises on composite variables and I got stuck in my code, which at first I can not seem to solve even though it seems to be something simple.

At the time of the result display, the student's notes are not being displayed individually, but the sum of all, ie: Student 1 displays the notes correctly, Student 2 displays the notes of 1 in addition to their own, and 3 displays the previous ones and his.

I need to know how I can show all the notes of each student individually, without showing the previous ones.

I imagine the problem is in the way I defined the variable "register2"

Follow the code:

import javax.swing.JOptionPane;

public class exercicio3{

    static final int NOTAS = 6;

    static class ALUNO {
        String Nome, Curso;
        int Semestre, Sala;
        double Notas [] = new double [NOTAS];
    }

    public static void main(String args[]){

        int alunos = Integer.parseInt(JOptionPane.showInputDialog("Insira a quantidade de alunos que irá registrar."));
        ALUNO Alunos [] = new ALUNO [alunos];
        int i = 0;
        int j = 0;

        for(i = 0; i < alunos; i++){
            int numaluno = i+1;
            Alunos[i] = new ALUNO ();
            Alunos[i].Nome = JOptionPane.showInputDialog("Insira o nome do aluno " + numaluno + ":");
            Alunos[i].Curso = JOptionPane.showInputDialog("Insira o curso do aluno " + numaluno + ":");
            Alunos[i].Semestre = Integer.parseInt(JOptionPane.showInputDialog("Insira o semestre(1 ou 2) do aluno " + numaluno + ":"));
            Alunos[i].Sala = Integer.parseInt(JOptionPane.showInputDialog("Insira a Sala do aluno " + numaluno + ":"));

            for(j = 0; j < NOTAS; j++){
                int qualnota = j+1;
                Alunos[i].Notas[j] = Double.parseDouble(JOptionPane.showInputDialog("Insira a " + qualnota + " nota do aluno " + numaluno + ":"));
            }

        }


        String registromostrar1 = "";
        String registromostrar2 = "";
        String registromostrar3 = "";

        for(i = 0; i < alunos; i++){
            int numaluno = i+1;
            for(j = 0; j < NOTAS; j++){
                registromostrar2 +=  Alunos[i].Notas[j] + " ; ";
            }

            registromostrar1 = "Dados do aluno " + numaluno + ":" + "\nNome: " + Alunos[i].Nome + "." +
            "\nCurso: " + Alunos[i].Curso + "." +
            "\nSemestre: " + Alunos[i].Semestre + "." +
            "\nSala: " + Alunos[i].Sala + "." +
            "\nNotas: " + registromostrar2;

            registromostrar3 += registromostrar1 + "\n\n\n";

        }

        JOptionPane.showMessageDialog(null, registromostrar3);





    }

java array

asked by anonymous 01.10.2017 / 16:36

1 answer

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score 0 · Accepted Answer

The problem is simple, you forgot to clear your logromostrar2

import javax.swing.JOptionPane;

public class JavaApplication5 {

    /**
     * @param args the command line arguments
     */

    static final int NOTAS = 6;

    static class ALUNO {
        String Nome, Curso;
        int Semestre, Sala;
        double Notas [] = new double [NOTAS];
    }
    public static void main(String[] args) {
        // TODO code application logic here

        int alunos = Integer.parseInt(JOptionPane.showInputDialog("Insira a quantidade de alunos que irá registrar."));
        ALUNO Alunos [] = new ALUNO [alunos];
        int i = 0;
        int j = 0;

        for(i = 0; i < alunos; i++){
            int numaluno = i+1;
            Alunos[i] = new ALUNO ();
            Alunos[i].Nome = JOptionPane.showInputDialog("Insira o nome do aluno " + numaluno + ":");
            Alunos[i].Curso = JOptionPane.showInputDialog("Insira o curso do aluno " + numaluno + ":");
            Alunos[i].Semestre = Integer.parseInt(JOptionPane.showInputDialog("Insira o semestre(1 ou 2) do aluno " + numaluno + ":"));
            Alunos[i].Sala = Integer.parseInt(JOptionPane.showInputDialog("Insira a Sala do aluno " + numaluno + ":"));

            for(j = 0; j < NOTAS; j++){
                int qualnota = j+1;
                Alunos[i].Notas[j] = Double.parseDouble(JOptionPane.showInputDialog("Insira a " + qualnota + " nota do aluno " + numaluno + ":"));
            }

        }


        String registromostrar1 = "";
        String registromostrar2 = "";
        String registromostrar3 = "";

        for(i = 0; i < alunos; i++){
            int numaluno = i+1;
            registromostrar2 ="";
            for(j = 0; j < NOTAS; j++){

                registromostrar2 +=  Alunos[i].Notas[j] + " ; ";
            }

            registromostrar1 = "Dados do aluno " + numaluno + ":" + "\nNome: " + Alunos[i].Nome + "." +
            "\nCurso: " + Alunos[i].Curso + "." +
            "\nSemestre: " + Alunos[i].Semestre + "." +
            "\nSala: " + Alunos[i].Sala + "." +
            "\nNotas: " + registromostrar2;

            registromostrar3 += registromostrar1 + "\n\n\n";

        }

        JOptionPane.showMessageDialog(null, registromostrar3);
    }

}

The part of the code that you need to zero out so that there is no undue accumulation of the other student:

 for(i = 0; i < alunos; i++){
        int numaluno = i+1;
    //Linha adicionada
    registromostrar2 ="";
        for(j = 0; j < NOTAS; j++){

            registromostrar2 +=  Alunos[i].Notas[j] + " ; ";
        }

        registromostrar1 = "Dados do aluno " + numaluno + ":" + "\nNome: " + Alunos[i].Nome + "." +
        "\nCurso: " + Alunos[i].Curso + "." +
        "\nSemestre: " + Alunos[i].Semestre + "." +
        "\nSala: " + Alunos[i].Sala + "." +
        "\nNotas: " + registromostrar2;

        registromostrar3 += registromostrar1 + "\n\n\n";

    }