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AdjustmentEvent getAdjustmentType()

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollBar; import javax.swing.JScrollPane; public class Main {   public static void main(String args[]) {     JFrame frame = new JFrame();     Container contentPane = frame.getContentPane();     Icon icon = new ImageIcon("rntsoft.gif");     JButton b = new JButton(icon);     JScrollPane pane = new JScrollPane(b);     AdjustmentListener hListener = new AdjustmentListener() {       public void adjustmentValueChanged(AdjustmentEvent e) {         System.out.println("Horizontal: ");         dumpInfo(e);       }     };     JScrollBar hBar = pane.getHorizontalScrollBar();     hBar.addAdjustmentListener(hListener);     AdjustmentListener vListener = new AdjustmentListener() {       public void adjustmentValueChanged(AdjustmentEvent e) {         System.out.println("Vertical: ");         dumpInfo(e);       }     };     JScrollBar vBar = pane.getVerticalScrollBar();     vBar.addAdjustmentListener(vListener);     contentPane.add(pane, BorderLayout.CENTER);     frame.setSize(300, 200);     frame.setVisible(true);   }   private static void dumpInfo(AdjustmentEvent e) {     System.out.println("\tValue: " + e.getValue());     String type = null;     switch (e.getAdjustmentType()) {     case AdjustmentEvent.TRACK:       type = "Track";       break;     case AdjustmentEvent.BLOCK_DECREMENT:       type = "Block Decrement";       break;     case AdjustmentEvent.BLOCK_INCREMENT:       type = "Block Increment";       break;     case AdjustmentEvent.UNIT_DECREMENT:       type = "Unit Decrement";       break;     case AdjustmentEvent.UNIT_INCREMENT:       type = "Unit Increment";       break;     }     System.out.println("\tType: " + type);   } }