Fill table with data entered in Jtextfield, separated by comma

Question

I have the code under a JTextField, where you wanted to type numbers separated by comma, and that by clicking on JButton, data were added in a table column.

public class Dados extends javax.swing.JPanel {

    public Dados() {
        initComponents();
    }

        @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        vNomes = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();

        jLabel1.setText("Digite os valores separados por virgula");

        jButton1.setText("Formar tabela");

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "classes", "Xi", "Fi", "Fac"
            }
        ));
        jScrollPane1.setViewportView(jTable1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(33, 33, 33)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1)
                    .addComponent(vNomes, javax.swing.GroupLayout.PREFERRED_SIZE, 343, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(88, 88, 88)
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 119, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(214, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(31, 31, 31)
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(vNomes, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButton1)
                .addGap(18, 18, 18)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(412, Short.MAX_VALUE))
        );
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTextField vNomes;
    // End of variables declaration                   
}

Answer 1

You can pick up the text from JTextField and use the method split() to separate the values separated by comma to then add to the table. As you are using DefaultTableMoldel, you can use the method addRow() to add lines.

To avoid additions when the field has nothing, I used the method trim() to remove empty spaces in String captured from the field, and the conditional to verify that string is not empty.

I couldn’t reproduce your code, it looks like it was generated by netbeans, but see working in the example I drew up below:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import javax.swing.JTextField;
import javax.swing.JButton;

public class Dados2 extends JFrame {

    private JPanel contentPane;
    private JTextField textField;

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new Dados2().setVisible(true));
    }

    public Dados2() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(450, 300));
        contentPane = new JPanel(new BorderLayout());
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);

        JPanel panelField = new JPanel();
        contentPane.add(panelField, BorderLayout.NORTH);

        textField = new JTextField();
        panelField.add(textField);
        textField.setColumns(20);

        String[] columnNames = new String[] { "classes", "Xi", "Fi", "Fac" };

        DefaultTableModel model = new DefaultTableModel(columnNames, 0);
        JTable table = new JTable(model);
        JScrollPane scroll = new JScrollPane(table);

        contentPane.add(scroll, BorderLayout.CENTER);

        JPanel panelBtn = new JPanel();
        contentPane.add(panelBtn, BorderLayout.SOUTH);

        JButton jbutton = new JButton("Adicionar");
        panelBtn.add(jbutton);

        jbutton.addActionListener(e -> {

            String text = textField.getText();

            if (text.length() > 0 && text.contains(",")) {

                String[] values = text.split(",");

                for (int i = 0; i < values.length; i++) {
                    model.addRow(new Object[] { null, values[i], null, null });
                }
            }
        });
        pack();
    }
}

Working:

It is worth noting that, in addition to the empty string, the conditional also checks for commas in the string, which causes plain text not to be added to a single line. If you want to change this behavior, just remove the conditional text.contains(",").