Following are the programs to implement JScrollBar
1. Java Program to Implement a Vertical ScrollBar
Java
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class VerticalScrollBarDemo { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { JFrame frame = new JFrame("Vertical ScrollBar Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 300); // Create a panel to hold the content JPanel contentPanel = new JPanel(); contentPanel.setLayout(new BorderLayout()); // Create a JTextArea for displaying text JTextArea textArea = new JTextArea(10, 40); textArea.setWrapStyleWord(true); textArea.setLineWrap(true); // Add the text area to a JScrollPane with a vertical scrollbar JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); // Create a vertical scrollbar JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar(); // Add a button to simulate content updates JButton addButton = new JButton("Add Text"); addButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // Append text to the JTextArea textArea.append("JScrollBar Example.\n"); } }); // Add components to the content panel contentPanel.add(scrollPane, BorderLayout.CENTER); contentPanel.add(addButton, BorderLayout.SOUTH); // Add the content panel to the frame frame.add(contentPanel); frame.setVisible(true); }); } } |
Output :
Another Screenshot with Printed Data
2. Java Program to Implement a Horizontal ScrollBar
Below is the implementation of the above mentioned:
Java
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class HorizontalScrollBarDemo { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { JFrame frame = new JFrame("Horizontal ScrollBar Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 300); // Create a panel to hold the content JPanel contentPanel = new JPanel(); contentPanel.setLayout(new BorderLayout()); // Create a JTextArea for displaying text with horizontal scrolling JTextArea textArea = new JTextArea(10, 40); textArea.setWrapStyleWord(true); textArea.setLineWrap(false); // Disable line wrapping for horizontal scrolling // Create a JScrollPane with a horizontal scrollbar JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_NEVER, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); // Create a horizontal scrollbar JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar(); // Add a button to simulate content updates JButton addButton = new JButton("Add Text"); addButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // Append text horizontally to the JTextArea textArea.append("JScrollBar Example. "); } }); // Add components to the content panel contentPanel.add(scrollPane, BorderLayout.CENTER); contentPanel.add(addButton, BorderLayout.SOUTH); // Add the content panel to the frame frame.add(contentPanel); frame.setVisible(true); }); } } |
Output : (Horizontal ScollBar)
Extended ScrollBar:
3. Java Program to Implement setMinimum() ,setMaximum() ,setValue() ,getValue() in JScrollBar
Java
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class JScrollBarExample { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { // Create a JFrame JFrame frame = new JFrame("JScrollBar Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 300); // Create a JPanel to hold the content JPanel contentPanel = new JPanel(); contentPanel.setLayout(new BorderLayout()); // Create a horizontal JScrollBar JScrollBar horizontalScrollBar = new JScrollBar(JScrollBar.HORIZONTAL); // Set the minimum value for the horizontal scrollbar horizontalScrollBar.setMinimum(10); // Set the maximum value for the horizontal scrollbar horizontalScrollBar.setMaximum(100); // Set the initial value for the horizontal scrollbar horizontalScrollBar.setValue(50); // Create a label to display the scrollbar value JLabel valueLabel = new JLabel("Value: " + horizontalScrollBar.getValue()); // Add a change listener to the horizontal scrollbar horizontalScrollBar.addAdjustmentListener(new AdjustmentListener() { @Override public void adjustmentValueChanged(AdjustmentEvent e) { int value = horizontalScrollBar.getValue(); valueLabel.setText("Value: " + value); } }); // Add components to the content panel contentPanel.add(horizontalScrollBar, BorderLayout.NORTH); contentPanel.add(valueLabel, BorderLayout.CENTER); // Add the content panel to the frame frame.add(contentPanel); // Make the frame visible frame.setVisible(true); }); } } |
Output: (Setting Value According to ScrollBar)
Output Showing the value 90:
Java JScrollBar
Java’s Swing library provides various GUI components for creating graphical user interfaces. Among these components, is the JScrollBar class, which allows users to scroll through the content of a component, such as a JScrollPane. In Java JScrollBar is a part of javax.swing package.