Java Event AdjustmentListener Interface

Introduction

The interfaceAdjustmentListener is used for receiving adjustment events. The class that process adjustment events needs to implements this interface.

Class declaration

Following is the declaration for java.awt.event.AdjustmentListener interface:

public interface AdjustmentListener
extends EventListener

Interface methods

S.N.	Method & Description
1	void adjustmentValueChanged(AdjustmentEvent e)Invoked when the value of the adjustable has changed.

Methods inherited

This class inherits methods from the following interfaces:

java.awt.event.EventListener

AdjustmentListener Example

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

package com.tutorialspoint.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingListenerDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingListenerDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      SwingListenerDemo  swingListenerDemo = new SwingListenerDemo();  
      swingListenerDemo.showAdjustmentListenerDemo();
   }

   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        

      statusLabel.setSize(350,100);
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
         System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showAdjustmentListenerDemo(){
      headerLabel.setText("Listener in action: AdjustmentListener");      

      JPanel panel = new JPanel();
      JScrollBar scrollbar = new JScrollBar();
      scrollbar.addAdjustmentListener(new CustomAdjustmentListener());

      panel.add(scrollbar);
      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
      class CustomAdjustmentListener implements AdjustmentListener {
         public void adjustmentValueChanged(AdjustmentEvent e) {
            statusLabel.setText("Adjustment value: "
               +Integer.toString(e.getValue()));
         }
      }
}

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

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

If no error comes that means compilation is successful. Run the program using following command.

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

Verify the following output

LuffyCode Dev.