GoogleOlympiad

GoogleOlympiad is a Java program to display each of the 17 Google 2008 Olympic images.

This program demonstrates how to load and cache images from a jar file. An enclosed script shows how to collect a set of images.

Download: Click here to download the jar file.

import java.awt.*;

import java.awt.event.*;

import java.net.*;

import java.util.*;

import java.util.List;

import javax.swing.*;

import javax.swing.border.*;

/**

* @author John B. Matthews

*/

public class GoogleOlympiad extends JPanel implements ActionListener {

private static final int MAX = 20;

private static final Font sans = new Font("SansSerif", Font.PLAIN, 16);

private static final Border border =

BorderFactory.createMatteBorder(4, 16, 4, 16, Color.lightGray);

private List<String> list = new ArrayList<String>(MAX);

private List<ImageIcon> cache = new ArrayList<ImageIcon>(MAX);

private JLabel imageLabel = new JLabel();

private JButton prevButton = new JButton();

private JButton nextButton = new JButton();

private JComboBox favorites;

public GoogleOlympiad() {

this.setLayout(new BorderLayout());

list.add("opening.gif");

list.add("cycling.gif");

list.add("weightlifting.gif");

list.add("diving.gif");

list.add("rhythm.gif");

list.add("rings.gif");

list.add("basketball.gif");

list.add("badminton.gif");

list.add("soccer.gif");

list.add("rowing.gif");

list.add("pingpong.gif");

list.add("swimming.gif");

list.add("trackfield.gif");

list.add("highjump.gif");

list.add("martialarts.gif");

list.add("baseball.gif");

list.add("closing.gif");

for (int i = 0; i < list.size(); i++) cache.add(i, null);

JLabel titleLabel = new JLabel();

titleLabel.setText("The Google 2008 Olympiad");

titleLabel.setHorizontalAlignment(JLabel.CENTER);

titleLabel.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 24));

titleLabel.setBorder(border);

this.add(titleLabel, BorderLayout.NORTH);

imageLabel.setIcon(getImage(0));

imageLabel.setHorizontalAlignment(JLabel.CENTER);

imageLabel.setBorder(border);

this.add(imageLabel, BorderLayout.CENTER);

favorites = new JComboBox(

list.toArray(new String[list.size()]));

favorites.setActionCommand("favs");

favorites.addActionListener(this);

prevButton.setText("\u22b2Prev");

prevButton.setFont(sans);

prevButton.setActionCommand("prev");

prevButton.addActionListener(this);

nextButton.setText("Next\u22b3");

nextButton.setFont(sans);

nextButton.setActionCommand("next");

nextButton.addActionListener(this);

JPanel controlPanel = new JPanel();

controlPanel.add(prevButton);

controlPanel.add(favorites);

controlPanel.add(nextButton);

controlPanel.setBorder(border);

this.add(controlPanel, BorderLayout.SOUTH);

}

public void actionPerformed(ActionEvent ae) {

String cmd = ae.getActionCommand();

if ("favs".equals(cmd)) {

int index = favorites.getSelectedIndex();

ImageIcon image = getImage(index);

imageLabel.setIcon(image);

if (image != null) imageLabel.setText("");

else imageLabel.setText("Image not available.");

}

if ("prev".equals(cmd)) {

int index = favorites.getSelectedIndex() - 1;

if (index < 0) index = list.size() - 1;

favorites.setSelectedIndex(index);

}

if ("next".equals(cmd)) {

int index = favorites.getSelectedIndex() + 1;

if (index > list.size() - 1) index = 0;

favorites.setSelectedIndex(index);

}

public JButton getDefault() { return nextButton; }

// Return the (possibly cached) image having the given index.

private ImageIcon getImage(int index) {

ImageIcon image = cache.get(index);

if (image != null) return image;

String name = "images/" + list.get(index);

URL url = GoogleOlympiad.class.getResource(name);

if (url != null) {

image = new ImageIcon(url);

}

cache.set(index, image);

return image;

}

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

GoogleOlympiad go = new GoogleOlympiad();

frame.add(go);

frame.setTitle("Google Olympiad");

frame.setSize(400, 300);

frame.setVisible(true);

go.getDefault().requestFocusInWindow();

}

});

}