creating and binding components at runtime in Swing

[Nishi kotgire]

Hello,
I have a requirement in which depending on size of input arraylist I have to add same number of text boxes as the number of objects in the arraylist at runtime.can you please let me know how this can be achieved

Thanks,
Nishi

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
 
public class DynamicComponents implements ActionListener {
    Random seed = new Random();
    JPanel dynamicPanel;
 
    public void actionPerformed(ActionEvent e) {
        dynamicPanel.removeAll();
        int rows = 3 + seed.nextInt(14);  // [3 - 16]
        populate(rows);
    }
 
    private void populate(int rows) {
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(5,2,5,2);
        gbc.weighty = 1.0;
        for(int j = 0; j < rows; j++) {
            gbc.anchor = GridBagConstraints.EAST;
            gbc.gridwidth = GridBagConstraints.RELATIVE;
            dynamicPanel.add(new JLabel("textfield " + (j+1)), gbc);
            gbc.anchor = GridBagConstraints.WEST;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            dynamicPanel.add(new JTextField(12), gbc);
        }
        dynamicPanel.revalidate();  // new layout please
        dynamicPanel.repaint();
    }
 
    private JScrollPane getDynamicPanel() {
        dynamicPanel = new JPanel(new GridBagLayout());
        populate(4);
        return new JScrollPane(dynamicPanel);
    }
 
    private JPanel getLastPanel() {
        JButton button = new JButton("populate");
        button.addActionListener(this);
        JPanel panel = new JPanel();
        panel.add(button);
        return panel;
    }
 
    public static void main(String[] args) {
        DynamicComponents test = new DynamicComponents();
        JPanel lastPanel = test.getLastPanel();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test.getDynamicPanel());
        f.add(lastPanel, "Last");
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        ((JButton)lastPanel.getComponent(0)).requestFocusInWindow();
    }
}

[Ilja Preuss]

Nishi, what part do you have problems with - what exactly is your doubt?