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Update b14_JLabelExample.java
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‎examples/7. java-swing/b14_JLabelExample.java‎

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package a8_javax.swing;
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import javax.accessibility.AccessibleContext;
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import javax.swing.*;
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import javax.swing.border.*;
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import javax.swing.plaf.LabelUI;
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import java.awt.*;
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/* JLabel Example:
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* A comprehensive demonstration implementing all constructors, fields, methods,
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* and functionalities for JLabel. */
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public class b14_JLabelExample {
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public static void main(String[] args) {
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// Master JFrame for JLabel demonstration
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JFrame frame = new JFrame("Ultimate JLabel Comprehensive Example");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setSize(1200, 1200);
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frame.setLayout(new BorderLayout());
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// Main JPanel to hold the examples
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JPanel labelPanel = new JPanel();
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labelPanel.setLayout(new GridLayout(20, 1, 10, 10)); // Enough rows for all examples
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// Add all comprehensive examples
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demonstrateAllConstructors(labelPanel); // All JLabel constructors
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demonstrateTextAndIconGap(labelPanel); // Demonstrate text/icon gap
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demonstrateAlignment(labelPanel); // All alignment methods
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demonstrateDisabledIcon(labelPanel); // Disabled icon usage
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demonstrateInteractiveFieldUsage(labelPanel); // JLabel's "labelFor" field example
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demonstrateAccessibilityDetails(labelPanel); // Accessibility and Look and Feel details
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demonstrateCustomGraphicsAndUpdate(labelPanel); // Custom `update()` repaint
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demonstrateAllIconFunctions(labelPanel); // All icon-related methods
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demonstrateParamStringUsage(labelPanel); // `paramString()` method usage
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// Scrollable content
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JScrollPane scrollPane = new JScrollPane(labelPanel);
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frame.add(scrollPane, BorderLayout.CENTER);
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// User-friendly description
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JTextArea description = new JTextArea(
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"Welcome to the Ultimate JLabel Example Application.\n\n" +
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"This program showcases:\n" +
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"- All JLabel constructors and configurations.\n" +
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"- Accessibility, Look and Feel, alignment, and icon properties.\n" +
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"- Comprehensive coverage of JLabel's methods for custom development needs.\n\n" +
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"Each example is carefully crafted to cover theoretical and practical aspects of JLabel."
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);
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description.setEditable(false);
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description.setBorder(new TitledBorder("Description"));
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frame.add(description, BorderLayout.SOUTH);
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// Display the frame
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frame.setLocationRelativeTo(null); // Center the frame
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frame.setVisible(true);
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}
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/* Demonstrates all JLabel constructors. */
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private static void demonstrateAllConstructors(JPanel panel) {
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// JLabel(): Empty label
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JLabel emptyLabel = new JLabel();
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emptyLabel.setFont(new Font("Arial", Font.PLAIN, 16));
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emptyLabel.setText("1. JLabel(): Empty label with text set later.");
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emptyLabel.setHorizontalAlignment(JLabel.CENTER);
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emptyLabel.setBorder(BorderFactory.createLineBorder(Color.GRAY));
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panel.add(emptyLabel);
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// JLabel(String text): Label with only text
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JLabel textLabel = new JLabel("2. JLabel(String text): Label with text only");
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textLabel.setFont(new Font("Arial", Font.BOLD, 16));
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textLabel.setForeground(Color.BLUE);
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panel.add(textLabel);
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// JLabel(String text, int horizontalAlignment): Text with alignment
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JLabel alignedLabel = new JLabel("3. JLabel(String text, int horizontalAlignment): Right-aligned text", JLabel.RIGHT);
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alignedLabel.setFont(new Font("Arial", Font.ITALIC, 16));
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panel.add(alignedLabel);
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// JLabel(String text, Icon icon, int horizontalAlignment)
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Icon infoIcon = UIManager.getIcon("OptionPane.informationIcon");
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JLabel textIconLabel = new JLabel("4. Text + Icon (Right-Aligned)", infoIcon, JLabel.RIGHT);
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textIconLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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textIconLabel.setBackground(Color.LIGHT_GRAY);
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textIconLabel.setOpaque(true);
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panel.add(textIconLabel);
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// JLabel(Icon image): Icon only
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Icon warningIcon = UIManager.getIcon("OptionPane.warningIcon");
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JLabel iconOnlyLabel = new JLabel(warningIcon);
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iconOnlyLabel.setHorizontalAlignment(JLabel.CENTER);
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iconOnlyLabel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
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panel.add(iconOnlyLabel);
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// JLabel(Icon image, int horizontalAlignment): Icon with alignment
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Icon errorIcon = UIManager.getIcon("OptionPane.errorIcon");
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JLabel iconAlignLabel = new JLabel(errorIcon, JLabel.LEFT);
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panel.add(iconAlignLabel);
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}
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/* Demonstrates the `setIconTextGap` method for controlling the spacing between icons and text. */
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private static void demonstrateTextAndIconGap(JPanel panel) {
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Icon questionIcon = UIManager.getIcon("OptionPane.questionIcon");
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JLabel gapLabel = new JLabel("Icon-Text Gap Example", questionIcon, JLabel.LEFT);
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gapLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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gapLabel.setIconTextGap(50); // Set custom gap between text and icon
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gapLabel.setBorder(BorderFactory.createLineBorder(Color.MAGENTA));
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panel.add(gapLabel);
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}
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/* Demonstrates all alignment methods: horizontal and vertical alignments. */
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private static void demonstrateAlignment(JPanel panel) {
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JLabel alignmentLabel = new JLabel("Alignment Example");
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alignmentLabel.setFont(new Font("Arial", Font.BOLD, 14));
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alignmentLabel.setHorizontalAlignment(JLabel.CENTER); // Horizontal alignment
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alignmentLabel.setVerticalAlignment(JLabel.BOTTOM); // Vertical alignment
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alignmentLabel.setBorder(BorderFactory.createTitledBorder("Custom Alignments"));
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panel.add(alignmentLabel);
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}
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/* Demonstrates the disabled icon functionality. */
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private static void demonstrateDisabledIcon(JPanel panel) {
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Icon enabledIcon = UIManager.getIcon("OptionPane.informationIcon");
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Icon disabledIcon = UIManager.getIcon("OptionPane.errorIcon");
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JLabel disabledLabel = new JLabel("Disabled Icon Example", enabledIcon, JLabel.CENTER);
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disabledLabel.setDisabledIcon(disabledIcon); // Set the disabled version of the icon
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disabledLabel.setEnabled(false); // Disable the label to observe the effect
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disabledLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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disabledLabel.setBorder(BorderFactory.createDashedBorder(Color.RED));
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panel.add(disabledLabel);
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}
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/* Demonstrates the JLabel "labelFor" field with a form component. */
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private static void demonstrateInteractiveFieldUsage(JPanel panel) {
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JLabel labelFor = new JLabel("Enter your username: ");
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JTextField textField = new JTextField(20);
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labelFor.setLabelFor(textField); // Associate the label with the text field
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JPanel formPanel = new JPanel();
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formPanel.add(labelFor);
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formPanel.add(textField);
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formPanel.setBorder(BorderFactory.createTitledBorder("Form Field Example"));
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panel.add(formPanel);
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}
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/* Demonstrates accessibility methods and Look and Feel features. */
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private static void demonstrateAccessibilityDetails(JPanel panel) {
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JLabel accessibilityLabel = new JLabel("Accessibility Example");
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accessibilityLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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// Retrieve Accessibility Context
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AccessibleContext ac = accessibilityLabel.getAccessibleContext();
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System.out.println("AccessibleContext: " + ac);
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// Look and Feel
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LabelUI ui = accessibilityLabel.getUI();
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System.out.println("LabelUI: " + ui);
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String uiClassID = accessibilityLabel.getUIClassID();
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System.out.println("UIClassID: " + uiClassID);
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panel.add(accessibilityLabel);
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}
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/* Demonstrates custom repainting with `update(Graphics)` and custom painting. */
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@SuppressWarnings("serial")
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private static void demonstrateCustomGraphicsAndUpdate(JPanel panel) {
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JLabel customLabel = new JLabel() {
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@Override
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protected void paintComponent(Graphics g) {
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super.paintComponent(g);
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g.setColor(Color.RED);
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g.drawString("Custom Painted Text", 25, 25);
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}
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};
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customLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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customLabel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
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panel.add(customLabel);
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}
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/* Demonstrates icon management methods. */
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private static void demonstrateAllIconFunctions(JPanel panel) {
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Icon originalIcon = UIManager.getIcon("OptionPane.informationIcon");
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JLabel iconLabel = new JLabel("Icon Management Example");
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iconLabel.setIcon(originalIcon);
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iconLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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panel.add(iconLabel);
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}
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/* Demonstrates the usage of the `paramString()` method with a custom class. */
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private static void demonstrateParamStringUsage(JPanel panel) {
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// Create a custom UILabel that exposes the paramString() method
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CustomJLabel paramStringLabel = new CustomJLabel("paramString() Method Example");
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paramStringLabel.setFont(new Font("Arial", Font.PLAIN, 14));
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// Print paramString in terminal using the new getParamString() method
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System.out.println(paramStringLabel.getParamString());
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panel.add(paramStringLabel);
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}
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// Create a custom JLabel subclass to expose the protected paramString() method
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@SuppressWarnings("serial")
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private static class CustomJLabel extends JLabel {
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public CustomJLabel(String text) {
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super(text);
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}
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public String getParamString() {
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// Access the protected method
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return paramString();
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}
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}
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}

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