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AWT 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:/ > AWT > com > tutorialspoint > gui >
AwtListenerDemo.javapackage com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; public class AwtListenerDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtListenerDemo(){ prepareGUI(); } public static void main(String[] args){ AwtListenerDemo awtListenerDemo = new AwtListenerDemo(); awtListenerDemo.showAdjustmentListenerDemo(); } private void prepareGUI(){ mainFrame = new Frame("Java AWT 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 Label(); headerLabel.setAlignment(Label.CENTER); statusLabel = new Label(); statusLabel.setAlignment(Label.CENTER); statusLabel.setSize(350,100); controlPanel = new Panel(); 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"); ScrollPane panel = new ScrollPane(); panel.setBackground(Color.magenta); panel.getHAdjustable().addAdjustmentListener(new CustomAdjustmentListener()); Label msglabel = new Label(); msglabel.setAlignment(Label.CENTER); msglabel.setText("Welcome to TutorialsPoint AWT Tutorial."); panel.add(msglabel); 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:/ > AWT and type the following command.
D:\AWT>javac com\tutorialspoint\gui\AwtListenerDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.tutorialspoint.gui.AwtListenerDemo
Verify the following output
awt_event_listeners.htm
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