LunarPhases: the use of JButton, JTextField and JLabel
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// 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(2, 1, 5, 5));
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
// 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(5, 5, 5, 5)));
phaseIconLabel.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createEmptyBorder(0, 0, 10, 0), 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(5, 5, 5, 5)));
// Add border around the display panel.
displayPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory
.createTitledBorder("Display Phase"), BorderFactory
.createEmptyBorder(5, 5, 5, 5)));
// 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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