SWING - JScrollBar Class

Introduction

The class JScrollBar is an implementation of scrollbar.

Class Declaration

Following is the declaration for javax.swing.JScrollBar class −

public class JScrollBar
   extends JComponent
      implements Adjustable, Accessible

Field

Following are the fields for javax.swing.ImageIcon class −

• protected int blockIncrement

• protected BoundedRangeModel model − The model that represents the scrollbar's minimum, maximum, extent (aka "visibleAmount") and current value.

• protected int orientation

• protected int unitIncrement

Class Constructors

Class Methods

Methods Inherited

This class inherits methods from the following classes −

• java.lang.Object

JScrollBar Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >

SwingControlDemo.java

package com.tutorialspoint.gui;
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class SwingControlDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingControlDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showScrollbarDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showScrollbarDemo() {                                       
      headerLabel.setText("Control in action: JScrollbar"); 

      final JScrollBar horizontalScroller = new JScrollBar(JScrollBar.HORIZONTAL);
      final JScrollBar verticalScroller = new JScrollBar();
      verticalScroller.setOrientation(JScrollBar.VERTICAL);
      horizontalScroller.setMaximum (100);
      horizontalScroller.setMinimum (1);
      verticalScroller.setMaximum (100);
      verticalScroller.setMinimum (1);
      
      horizontalScroller.addAdjustmentListener(new AdjustmentListener() {
         @Override
         public void adjustmentValueChanged(AdjustmentEvent e) {
            statusLabel.setText("Horozontal: "
               +horizontalScroller.getValue() 
               +" ,Vertical: "
               + verticalScroller.getValue());
            }
      });
      verticalScroller.addAdjustmentListener(new AdjustmentListener() {
         @Override
         public void adjustmentValueChanged(AdjustmentEvent e) {
            statusLabel.setText("Horozontal: "
               +horizontalScroller.getValue() 
               +" ,Vertical: "+ verticalScroller.getValue());
         }
      });
      controlPanel.add(horizontalScroller);
      controlPanel.add(verticalScroller);
      
      mainFrame.setVisible(true);  
   } 
}

Compile the program using the command prompt. Go to D:/ > SWING and type the following command.

D:\SWING>javac com\tutorialspoint\gui\SwingControlDemo.java

If no error occurs, it means the compilation is successful. Run the program using the following command.

D:\SWING>java com.tutorialspoint.gui.SwingControlDemo

Verify the following output.