Java Swing: Removing and Exporting Candidate Data to a Text File

Removing and Exporting Candidate Data in Java Swing

The following methods handle the removal of a candidate record and the export of candidate data to a text file.

Removing a Candidate

btnRemoverMousePressed removes the candidate whose CPF is shown in the txtCPF field, then displays the first remaining candidate, if any.

private void btnRemoverMousePressed(java.awt.event.MouseEvent evt) {
    // TODO add your handling code here:
    if (this.dados.containsKey(txtCPF.getText())) {
        this.dados.remove(txtCPF.getText());
        this.indices.remove(txtCPF.getText());
    }

    if (this.indices.size() > 0) { // Check whether any records remain
        String cpfProx = this.indices.get(0); // Return to the first record
        Candidato c = this.dados.get(cpfProx);
        this.preencherCampos(c);
    }
}

Exporting Candidate Data

btnExportMousePressed writes the data of the current candidate to a file named after the candidate's CPF. The export only runs when no new record is being inserted.

private void btnExportMousePressed(java.awt.event.MouseEvent evt) {
    // TODO add your handling code here:
    FileWriter arq;
    if (!this.novo) { // Ensure no insertion is in progress
        try {
            arq = new FileWriter(txtCPF.getText() + ".txt"); // File name uses the candidate's CPF
            PrintWriter gravarArq = new PrintWriter(arq);

            // Write the candidate's data to the file
            Candidato c = this.dados.get(txtCPF.getText());
            gravarArq.printf("Candidato: " + c.getNome());
            gravarArq.printf("\t\tCPF: " + c.getCpf());
            gravarArq.printf("\nNascimento: " + c.getNascimento());
            gravarArq.printf("\t\tIdade: " + String.valueOf(c.getIdade()));
            gravarArq.printf("\nEscolaridade: " + c.getListaEscolaridade()[c.getEscolaridade()]);
            gravarArq.printf("\nInstituição: " + c.getInstituicao());
            if (c.getEscolaridade() == 2)
                gravarArq.printf("\nCurso: " + c.getCurso());
            gravarArq.printf("\nCargo Pretendido: " + c.getCargo());
            gravarArq.printf("\t\tSalário Pretendido: " + String.valueOf(c.getSalario()));

            arq.close();

            JOptionPane.showMessageDialog(null, "Arquivo exportado com sucesso!");
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Problemas na escrita do arquivo");
        }
    }
}

Important Notes

• The PrintWriter is only flushed when the file is closed. Closing arq before the PrintWriter is also safer, so consider calling gravarArq.close() instead.
• Use println instead of printf when the text contains no format specifiers, since printf treats % characters as formatting directives.