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From: albert kao <albertkao3@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: align Swing JLabels and JTextFields vertically with
Date: Tue, 26 Apr 2011 07:02:53 -0700 (PDT)
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On Apr 21, 7:47=A0pm, Knute Johnson <nos...@knutejohnson.com> wrote:
> How about this? =A0One thing I don't understand is how SpringLayout
> determines sizes.
>
> import java.awt.*;
> import javax.swing.*;
> import javax.swing.border.*;
>
> public class test extends JPanel {
> =A0 =A0 =A0JLabel l1,l2,l3;
> =A0 =A0 =A0JTextField tf1,tf2,tf3;
>
> =A0 =A0 =A0public test() {
> =A0 =A0 =A0 =A0 =A0super(new GridBagLayout());
>
> =A0 =A0 =A0 =A0 =A0GridBagConstraints c =3D new GridBagConstraints();
> =A0 =A0 =A0 =A0 =A0c.fill =3D GridBagConstraints.BOTH;
> =A0 =A0 =A0 =A0 =A0c.weightx =3D c.weighty =3D 1.0;
> =A0 =A0 =A0 =A0 =A0c.gridx =3D 0;
>
> =A0 =A0 =A0 =A0 =A0SpringLayout spring =3D new SpringLayout();
>
> =A0 =A0 =A0 =A0 =A0JPanel p1 =3D new JPanel(spring);
> =A0 =A0 =A0 =A0 =A0p1.setBorder(BorderFactory.createTitledBorder("Panel 1=
"));
> =A0 =A0 =A0 =A0 =A0add(p1,c);
>
> =A0 =A0 =A0 =A0 =A0l1 =3D new JLabel("Label1");
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.EAST,l1,-2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p1);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,l1,0=
,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p1);
> =A0 =A0 =A0 =A0 =A0tf1 =3D new JTextField("this is text field 1",20);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.WEST,tf1,2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p1);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,tf1,=
0,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p1);
>
> =A0 =A0 =A0 =A0 =A0p1.add(l1);
> =A0 =A0 =A0 =A0 =A0p1.add(tf1);
>
> =A0 =A0 =A0 =A0 =A0JPanel p2 =3D new JPanel(spring);
> =A0 =A0 =A0 =A0 =A0p2.setBorder(BorderFactory.createTitledBorder("Panel 3=
"));
> =A0 =A0 =A0 =A0 =A0add(p2,c);
>
> =A0 =A0 =A0 =A0 =A0l2 =3D new JLabel("************ LONG LABEL ***********=
");
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.EAST,l2,-2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p2);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,l2,0=
,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p2);
> =A0 =A0 =A0 =A0 =A0tf2 =3D new JTextField("Short Textfield");
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.WEST,tf2,2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p2);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,tf2,=
0,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p2);
>
> =A0 =A0 =A0 =A0 =A0p2.add(l2);
> =A0 =A0 =A0 =A0 =A0p2.add(tf2);
>
> =A0 =A0 =A0 =A0 =A0JPanel p3 =3D new JPanel(spring);
> =A0 =A0 =A0 =A0 =A0p3.setBorder(BorderFactory.createTitledBorder("Panel 3=
"));
> =A0 =A0 =A0 =A0 =A0add(p3,c);
>
> =A0 =A0 =A0 =A0 =A0l3 =3D new JLabel("Label 3");
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.EAST,l3,-2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p3);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,l3,0=
,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p3);
>
> =A0 =A0 =A0 =A0 =A0tf3 =3D new JTextField("TextField 3",30);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.WEST,tf3,2,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.HORIZONTAL_CENTER,p3);
> =A0 =A0 =A0 =A0 =A0spring.putConstraint(SpringLayout.VERTICAL_CENTER,tf3,=
0,
> =A0 =A0 =A0 =A0 =A0 SpringLayout.VERTICAL_CENTER,p3);
>
> =A0 =A0 =A0 =A0 =A0p3.add(l3);
> =A0 =A0 =A0 =A0 =A0p3.add(tf3);
>
> System.out.println(spring.maximumLayoutSize(p3));
> System.out.println(spring.minimumLayoutSize(p3));
> System.out.println(spring.preferredLayoutSize(p3));
> =A0 =A0 =A0}
>
> =A0 =A0 =A0public static void main(String[] args) {
> =A0 =A0 =A0 =A0 =A0EventQueue.invokeLater(new Runnable() {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0public void run() {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0JFrame f =3D new JFrame();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0f.setDefaultCloseOperation(JFrame.EXIT=
_ON_CLOSE);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0test t =3D new test();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0f.add(t,BorderLayout.CENTER);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0f.setSize(600,450);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0f.setVisible(true);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0}
> =A0 =A0 =A0 =A0 =A0});
> =A0 =A0 =A0}
>
> }
>
> --
>
> Knute Johnson
> s/knute/nospam/

Your program works using SpringLayout.
Thank you!
How to use GridBagLayout to do the same thing?