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Test of the DragGesture classes and JList to see if we

/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O'Reilly  */ // GestureTest.java //A simple (?) test of the DragGesture classes to see if we //can recognize a simple drag gesture. // import java.awt.BorderLayout; import java.awt.dnd.DnDConstants; import java.awt.dnd.DragGestureEvent; import java.awt.dnd.DragGestureListener; import java.awt.dnd.DragGestureRecognizer; import java.awt.dnd.DragSource; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.ListSelectionModel; public class GestureTest extends JFrame implements DragGestureListener {   DragSource ds;   JList jl;   String[] items = { "Java", "C", "C++", "Lisp", "Perl", "Python" };   public GestureTest() {     super("Gesture Test");     setSize(200, 150);     addWindowListener(new WindowAdapter() {       public void windowClosing(WindowEvent we) {         System.exit(0);       }     });     jl = new JList(items);     jl.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);     getContentPane().add(new JScrollPane(jl), BorderLayout.CENTER);     ds = new DragSource();     DragGestureRecognizer dgr = ds.createDefaultDragGestureRecognizer(jl,         DnDConstants.ACTION_COPY, this);     setVisible(true);   }   public void dragGestureRecognized(DragGestureEvent dge) {     System.out.println("Drag Gesture Recognized!");   }   public static void main(String args[]) {     new GestureTest();   } }