Sample drag and drop functionality in Java swing

Java implements the drag and drop example

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Swing drag-and-drop function, the code is very simple, there are comments, you see, the operation effect is as follows:

package com;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.util.List;
import javax.swing.*;

public class DragTest extends JFrame
{

    JPanel panel;//Accept drag-and-drop panels
    public DragTest()
    {
        panel = new JPanel();
        panel.setBackground(Color.YELLOW);
        getContentPane().add(panel, BorderLayout.CENTER);
        setSize(500, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocation(400, 200);
        setTitle(" Simplest drag-and-drop example: drag a file to the following ( 20130124 ) ");
        drag();//To enable drag-and-drop
    }
    public static void main(String[] args) throws Exception
    {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");//Set up the skin
        new DragTest().setVisible(true);;
    }
    public void drag()//The defined drag and drop method
    {
        //A panel represents the control to accept drag and drop
        new DropTarget(panel, DnDConstants.ACTION_COPY_OR_MOVE, new DropTargetAdapter()
        {
            @Override
            public void drop(DropTargetDropEvent dtde)//Override the adapter's drop method
            {
                try
                {
                    if (dtde.isDataFlavorSupported(DataFlavor.javaFileListFlavor))//If the file format is supported
                    {
                        dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);//Receive the data from the drag and drop
                        List<File> list =  (List<File>) (dtde.getTransferable().getTransferData(DataFlavor.javaFileListFlavor));
                        String temp="";
                        for(File file:list)
                            temp+=file.getAbsolutePath()+";n";
                        JOptionPane.showMessageDialog(null, temp);
                        dtde.dropComplete(true);//Indicates that the drag operation has completed
                    }
                    else
                    {
                        dtde.rejectDrop();//Otherwise drag and drop data is rejected
                    }
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
    }
}