Re: align Swing JLabels and JTextFields vertically with

I like to have 3 TitledBorders for 3 different areas of my frame.
Each area has its own components - JLabels, JTextField, etc.
How to align Swing JLabels and JTextFields vertically in different
areas?
e.g. for the following test program, how to configure label1, label2,
label3 so that their right sides all align vertically and
tf1, tf2, tf3 so that their left sides all align vertically?
My jdk version is 6.

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

public class TitledBorderDemo extends JFrame {
   public TitledBorderDemo() {
     super("TitledBorderDemo");

     JTextField tf1 = new JTextField("hello", 6);
     JTextField tf2 = new JTextField("hello", 12);
     JTextField tf3 = new JTextField("test");
     JTextField tf4 = new JTextField("test2");

     JLabel label1 = new JLabel("1234567890ertyuiyup label");
     JLabel label2 = new JLabel("zzzzzzzzzzzzzzzzzzzzzzzzzzzzzz long
label");
     JLabel label3 = new JLabel("short label");
     JLabel label4 = new JLabel("test");

     JPanel panel_tf = new JPanel(new GridBagLayout());
     JPanel panel_pf = new JPanel(new GridBagLayout());
     JPanel panel_ftf = new JPanel(new GridBagLayout());

     GridBagConstraints constraints = new GridBagConstraints(0, 0, 3,
3,
             0.0, 0.0, GridBagConstraints.WEST,
GridBagConstraints.NONE,
             new Insets(10, 10, 10, 10), 0, 0);

     constraints.gridx = 0;
     constraints.gridy = 0;
     constraints.gridwidth = 2;
     constraints.anchor = GridBagConstraints.WEST;
     panel_tf.add(label1, constraints);

     constraints.gridx = 2;
     constraints.gridwidth = 1;
     constraints.anchor = GridBagConstraints.EAST;
     panel_tf.add(tf1, constraints);

     constraints.gridx = 0;
     constraints.gridy = 1;
     constraints.gridwidth = 2;
     constraints.anchor = GridBagConstraints.WEST;
     panel_pf.add(label2, constraints);

     constraints.gridx = 2;
     constraints.gridwidth = 1;
     constraints.anchor = GridBagConstraints.EAST;
     panel_pf.add(tf2, constraints);

     constraints.gridx = 0;
     constraints.gridy = 2;
     constraints.gridwidth = 2;
     constraints.anchor = GridBagConstraints.WEST;
     panel_ftf.add(label3, constraints);

     constraints.gridx = 2;
     constraints.gridwidth = 1;
     constraints.anchor = GridBagConstraints.EAST;
     panel_ftf.add(tf3, constraints);

     constraints.gridx = 3;
     constraints.gridwidth = 1;
     constraints.anchor = GridBagConstraints.WEST;
     panel_ftf.add(label4, constraints);

     constraints.gridx = 4;
     constraints.anchor = GridBagConstraints.EAST;
     panel_ftf.add(tf4, constraints);

     panel_tf.setBorder(new TitledBorder("JTextField1"));
     panel_pf.setBorder(new TitledBorder("JTextField2"));
     panel_ftf.setBorder(new TitledBorder("JTextField3"));

     JPanel pan = new JPanel(new GridLayout(3, 1, 10, 10));
     pan.add(panel_tf);
     pan.add(panel_pf);
     pan.add(panel_ftf);
     this.add(pan);
   }

   public static void main(String args[]) {
     JFrame frame = new TitledBorderDemo();
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frame.setSize(600, 450);
     frame.setVisible(true);
   }
}