Question

I’m trying to put the text field under the JLabel. Currently, the text field is displayed on the same line. It should be below and centered. I need assistance.

package Gui;

import javax.swing.*;
import java.awt.*;
import java.awt.GridLayout;

public class ShowGridLayout extends JFrame {

    public ShowGridLayout() {
        // Set GridLayout, 3 rows, 2 columns, and gaps 5 between
        // components horizontally and vertically
        setLayout(new GridLayout(3, 2, 5, 5));

        // Add labels and text fields to the frame

        JLabel firstname = new JLabel("First Name");
        add(firstname);

        JTextField fistnametextField = new JTextField(8);
        add(fistnametextField);

        JLabel mi = new JLabel("Mi");
        add(mi);

        JTextField miTextField = new JTextField(1);
        add(miTextField);

        JLabel lastname = new JLabel("Last Name");
        add(lastname);

        JTextField lastnameTextField = new JTextField(8);
        add(lastnameTextField);
    }

    /**
    * Main method
    */
    public static void main(String[] args) {
        ShowGridLayout frame = new ShowGridLayout();
        frame.setTitle("ShowGridLayout");
        frame.setSize(200, 125);
        frame.setLocationRelativeTo(null); // Center the frame
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

Answer 1

You could simply use a GridLayout with a single column:

setLayout(new GridLayout(0, 1));

Note that GridLayout will ignore the preferred sizes of the JTextFields so using the constructor JTextField(int columnSize) will have no effect so the default constructor will do.

Also I would remove the internal spacing here and add a border to the JFrame:

(JComponent)getContentPane()).setBorder(   
      BorderFactory.createEmptyBorder(10, 10, 10, 10) );  

This would produce a frame that looks like