How do I get a line back on my jTable?

Question

I’d like to know how to retrieve information from a line of mine JTable, follows the code line of the same.

Usuarios operacao = new Usuarios();
DefaultTableModel tabela = new DefaultTableModel();

private void adicionarLinhas(String nome, String patente, String sessao, String email) {
    this.tabela.addRow(new Object[]{nome, patente, sessao, email});
}

public void Executar() throws IOException, ClassNotFoundException {
    ArrayList<UsuariosBase> usuarios2 = operacao.LeituraDeRegistros();
    for (UsuariosBase registros : usuarios2) {
        tabela = (DefaultTableModel) jTable1.getModel();
        this.adicionarLinhas(registros.nome, registros.patente, registros.sessao, registros.email);
    }
}

public void Listar() throws IOException, ClassNotFoundException {
    operacao.RecuperadorDeNomes();
    for (int i = 1; i < operacao.totalDeArquivos; i++) {
        Executar();
    }
}

Answer 1

Just use getValueAt:

suaJTable.getModel().getValueAt(indiceLinha, indiceColuna);

The code does not make much sense the way it was presented, because this variable tabela is starting a DefaultTableModel empty, depending on the moment you call this method, it can return empty. But if you guarantee that this variable will match the model already applied in your Jtable, just call the method by it:

tabela.getValueAt(indiceLinha, indiceColuna);

Remembering that columns and rows always start at Indice 0, therefore, a table with 15 rows will have indices from 0 to 14.

To scan a selected row and grab all columns, one can do so:

int selectedRowIndex = jTable1.getSelectedRow();
int columnCount = suaJTable.getColumnCount();

for(int i = 0; i < columnCount; i++){
    //aqui você faz alguma coisa com o dado de cada coluna
    System.out.println(tabela.getValueAt(selectedRowIndex, i);)
}