Java- How to add more textfields by clicking a button?

Question

I have created a frame in Java which has some textfields and buttons in it. Assuming that user wants more textfields (for example to add more data), I want to put a button and when a user clicks the button, then a new textfield should appear. then user can fill data in it and again by clicking that button another textfield should appear. How can I do this ? What code I need to write for the button to show more and more text fields by clicking button? Thank you !

Answer 1

It would be wise that instead of adding components to your JFrame directly, you add them to a JPanel. Though related to your problem, have a look at this small example, hopefully might be able to give you some hint, else ask me what is out of bounds.

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

public class JFrameExample
{   
    private JFrame frame;
    private JButton button;
    private JTextField tfield;
    private String nameTField;
    private int count;

    public JFrameExample()
    {
        nameTField = "tField";
        count = 0;
    }

    private void displayGUI()
    {
        frame = new JFrame("JFrame Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new GridLayout(0, 1, 2, 2));
        button = new JButton("Add JTextField");
        button.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent ae)
            {
                tfield = new JTextField();
                tfield.setName(nameTField + count);
                count++;
                frame.add(tfield);
                frame.revalidate();  // For JDK 1.7 or above.
                //frame.getContentPane().revalidate(); // For JDK 1.6 or below.
                frame.repaint();
            }
        });
        frame.add(button);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                new JFrameExample().displayGUI();
            }
        });
    }
}