LunarPhases: the use of JButton, JTextField and JLabel : Basics « Swing JFC « Java

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Java » Swing JFC » Basics 




LunarPhases: the use of JButton, JTextField and JLabel

/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
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 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */
// v 1.3

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;

// This example demonstrates the use of JButton, JTextField
// and JLabel.
public class LunarPhases implements ActionListener {
  final static int NUM_IMAGES = 8;

  final static int START_INDEX = 3;

  ImageIcon[] images = new ImageIcon[NUM_IMAGES];

  JPanel mainPanel, selectPanel, displayPanel;

  JComboBox phaseChoices = null;

  JLabel phaseIconLabel = null;

  // Constructor
  public LunarPhases() {
    // Create the phase selection and display panels.
    selectPanel = new JPanel();
    displayPanel = new JPanel();

    // Add various widgets to the sub panels.
    addWidgets();

    // Create the main panel to contain the two sub panels.
    mainPanel = new JPanel();
    mainPanel.setLayout(new GridLayout(2155));
    mainPanel.setBorder(BorderFactory.createEmptyBorder(5555));

    // Add the select and display panels to the main panel.
    mainPanel.add(selectPanel);
    mainPanel.add(displayPanel);
  }

  // Create and the widgets to select and display the phases of the moon.
  private void addWidgets() {
    // Get the images and put them into an array of ImageIcon.

    for (int i = 0; i < NUM_IMAGES; i++) {
      String imageName = "images/image" + i + ".jpg";
      System.out.println("getting image: " + imageName);
//      URL iconURL = ClassLoader.getSystemResource(imageName);

  //    ImageIcon icon = new ImageIcon(iconURL);
      images[i= icon;
    }

    // Create label for displaying moon phase images and put a border around
    // it.
    phaseIconLabel = new JLabel();
    phaseIconLabel.setHorizontalAlignment(JLabel.CENTER);
    phaseIconLabel.setVerticalAlignment(JLabel.CENTER);
    phaseIconLabel.setVerticalTextPosition(JLabel.CENTER);
    phaseIconLabel.setHorizontalTextPosition(JLabel.CENTER);
    phaseIconLabel.setBorder(BorderFactory.createCompoundBorder(
        BorderFactory.createLoweredBevelBorder(), BorderFactory
            .createEmptyBorder(5555)));

    phaseIconLabel.setBorder(BorderFactory.createCompoundBorder(
        BorderFactory.createEmptyBorder(00100), phaseIconLabel
            .getBorder()));

    // Create combo box with lunar phase choices.
    String[] phases = "New""Waxing Crescent""First Quarter",
        "Waxing Gibbous""Full""Waning Gibbous""Third Quarter",
        "Waning Crescent" };
    phaseChoices = new JComboBox(phases);
    phaseChoices.setSelectedIndex(START_INDEX);

    // Display the first image.
    phaseIconLabel.setIcon(images[START_INDEX]);
    phaseIconLabel.setText("");

    // Add border around the select panel.
    selectPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
        .createTitledBorder("Select Phase"), BorderFactory
        .createEmptyBorder(5555)));

    // Add border around the display panel.
    displayPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
        .createTitledBorder("Display Phase"), BorderFactory
        .createEmptyBorder(5555)));

    // Add moon phases combo box to select panel and image label to
    // displayPanel.
    selectPanel.add(phaseChoices);
    displayPanel.add(phaseIconLabel);

    // Listen to events from combo box.
    phaseChoices.addActionListener(this);
  }

  // Implementation of ActionListener interface.
  public void actionPerformed(ActionEvent event) {
    if ("comboBoxChanged".equals(event.getActionCommand())) {
      // update the icon to display the new phase
      phaseIconLabel.setIcon(images[phaseChoices.getSelectedIndex()]);
    }
  }

  // main method
  public static void main(String[] args) {
    // create a new instance of LunarPhases
    LunarPhases phases = new LunarPhases();

    // Create a frame and container for the panels.
    JFrame lunarPhasesFrame = new JFrame("Lunar Phases");

    // Set the look and feel.
    try {
      UIManager.setLookAndFeel(UIManager
          .getCrossPlatformLookAndFeelClassName());
    catch (Exception e) {
    }

    lunarPhasesFrame.setContentPane(phases.mainPanel);

    // Exit when the window is closed.
    lunarPhasesFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Show the converter.
    lunarPhasesFrame.pack();
    lunarPhasesFrame.setVisible(true);
  }
}
           
       














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