package jdraganddropdemo;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.awt.datatransfer.*;import java.awt.dnd.*;public class MainFrame extends JFrame implements DropTargetListener {  private JPanel contentPane;  private BorderLayout borderLayout1 = new BorderLayout();  private JTextField jTextField1 = new JTextField();  DragJLabel label = new DragJLabel("Hello World !",SwingConstants.CENTER);  //Construct the frame  public MainFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(410, 114));    this.setTitle("JDragAndDropDemo");    jTextField1.setFont(new java.awt.Font("Dialog", 0, 14));    contentPane.add(jTextField1, BorderLayout.SOUTH);    contentPane.add(this.label,BorderLayout.NORTH);    new DropTarget(this.jTextField1,DnDConstants.ACTION_COPY_OR_MOVE,this);  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  public void dragEnter(DropTargetDragEvent dtde) {    /**@todo Implement this java.awt.dnd.DropTargetListener method*/    //throw new java.lang.UnsupportedOperationException("Method dragEnter() not yet implemented.");  }  public void dragOver(DropTargetDragEvent dtde) {    /**@todo Implement this java.awt.dnd.DropTargetListener method*/    //throw new java.lang.UnsupportedOperationException("Method dragOver() not yet implemented.");  }  public void dropActionChanged(DropTargetDragEvent dtde) {    /**@todo Implement this java.awt.dnd.DropTargetListener method*/    //throw new java.lang.UnsupportedOperationException("Method dropActionChanged() not yet implemented.");  }  public void dragExit(DropTargetEvent dte) {    /**@todo Implement this java.awt.dnd.DropTargetListener method*/    //throw new java.lang.UnsupportedOperationException("Method dragExit() not yet implemented.");  }  public void drop(DropTargetDropEvent dtde) {    /**@todo Implement this java.awt.dnd.DropTargetListener method*/    //throw new java.lang.UnsupportedOperationException("Method drop() not yet implemented.");    try{      Transferable tr = dtde.getTransferable();      if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor)){        dtde.acceptDrop(dtde.getDropAction());        String s = (String) tr.getTransferData(DataFlavor.stringFlavor);        this.jTextField1.setText(this.jTextField1.getText()+s);        dtde.dropComplete(true);      }else{        dtde.rejectDrop();      }    }catch(Exception err){        err.printStackTrace();      }  }}