BoxLayout Pane : Layout « Swing JFC « Java

BoxLayout Pane

BoxLayout Pane
 * Copyright (c) 2000 David Flanagan. All rights reserved. This code is from the
 * book Java Examples in a Nutshell, 2nd Edition. It is provided AS-IS, WITHOUT
 * ANY WARRANTY either expressed or implied. You may study, use, and modify it
 * for any non-commercial purpose. You may distribute it non-commercially as
 * long as you retain this notice. For a commercial use license, or to purchase
 * the book (recommended), visit

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.border.EmptyBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;

public class BoxLayoutPane extends JPanel {
  public BoxLayoutPane() {
    // Use a BorderLayout layout manager to arrange various Box components
    this.setLayout(new BorderLayout());

    // Give the entire panel a margin by adding an empty border
    // We could also do this by overriding getInsets()
    this.setBorder(new EmptyBorder(10, 10, 10, 10));

    // Add a plain row of buttons along the top of the pane
    Box row = Box.createHorizontalBox();
    for (int i = 0; i < 4; i++) {
      JButton b = new JButton("B" + i);
      b.setFont(new Font("serif", Font.BOLD, 12 + i * 2));
    this.add(row, BorderLayout.NORTH);

    // Add a plain column of buttons along the right edge
    // Use BoxLayout with a different kind of Swing container
    // Give the column a border: can't do this with the Box class
    JPanel col = new JPanel();
    col.setLayout(new BoxLayout(col, BoxLayout.Y_AXIS));
    col.setBorder(new TitledBorder(new EtchedBorder(), "Column"));
    for (int i = 0; i < 4; i++) {
      JButton b = new JButton("Button " + i);
      b.setFont(new Font("sanserif", Font.BOLD, 10 + i * 2));
    this.add(col, BorderLayout.EAST); // Add column to right of panel

    // Add a button box along the bottom of the panel.
    // Use "Glue" to space the buttons evenly
    Box buttonbox = Box.createHorizontalBox();
    buttonbox.add(Box.createHorizontalGlue()); // stretchy space
    buttonbox.add(new JButton("Okay"));
    buttonbox.add(Box.createHorizontalGlue()); // stretchy space
    buttonbox.add(new JButton("Cancel"));
    buttonbox.add(Box.createHorizontalGlue()); // stretchy space
    buttonbox.add(new JButton("Help"));
    buttonbox.add(Box.createHorizontalGlue()); // stretchy space
    this.add(buttonbox, BorderLayout.SOUTH);

    // Create a component to display in the center of the panel
    JTextArea textarea = new JTextArea();
    textarea.setText("This component has 12-pixel margins on left and top"
        + " and has 72-pixel margins on right and bottom.");

    // Use Box objects to give the JTextArea an unusual spacing
    // First, create a column with 3 kids. The first and last kids
    // are rigid spaces. The middle kid is the text area
    Box fixedcol = Box.createVerticalBox();
    fixedcol.add(Box.createVerticalStrut(12)); // 12 rigid pixels
    fixedcol.add(textarea); // Component fills in the rest
    fixedcol.add(Box.createVerticalStrut(72)); // 72 rigid pixels

    // Now create a row. Give it rigid spaces on the left and right,
    // and put the column from above in the middle.
    Box fixedrow = Box.createHorizontalBox();

    // Now add the JTextArea in the column in the row to the panel
    this.add(fixedrow, BorderLayout.CENTER);

  public static void main(String[] a) {
    JFrame f = new JFrame();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {

    f.setContentPane(new BoxLayoutPane());



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