Java simple copy paste cut function code sharing

Without further ado, go straight to the code and look at the comments.

/* Simple copy   shear   paste   function 

  Operation:   

   Copy the test :  Enter text to select text, click copy, and place the cursor on the right TextArea, Click paste 

   Cut test: enter text to select text, then place the cursor on the right TextArea, Click on the shear   

*/

import javax.swing.*;

import java.awt.*;

import java.awt.datatransfer.*;

import java.awt.event.*;

public class Demo implements ActionListener

{

 private JFrame jf;

 private JPanel p1, p2, p3;   //Top, middle, bottom 

 private JLabel title;

 private JTextArea edit,showMsg;

 private JButton copy,paste,cut;

 Clipboard clipboard;//Gets the system clipboard. < br / >
 

 public Demo()

 {

  this.init();

 }

 //Interface initialization 

 public void init()

 {

  jf = new JFrame(" Copy and paste ");

  p1 = new JPanel();   //Store the title 

  p2 = new JPanel(); //Store JTextArea showMsg

  p3 = new JPanel();  //Hold the button < br / >
  title = new JLabel(" Copy paste cut demo ");

  edit = new JTextArea(" Please enter the content ",15,25);

  edit.setLineWrap(true);

  showMsg = new JTextArea(15,25);

  showMsg.setLineWrap(true);

  showMsg.setEnabled(false);

  copy = new JButton(" copy ");

  paste = new JButton(" paste ");

  cut = new JButton(" shear ");

  clipboard = jf.getToolkit().getSystemClipboard();

  

  p1.setLayout(new FlowLayout());

  p1.setSize(599,30);

  p1.add(title);

  

  p2.setLayout(new FlowLayout());

  p2.setBackground(Color.gray);

  p2.add(edit);

  p2.add(showMsg);

  

  p3.setLayout(new FlowLayout());

  p3.add(copy);

  p3.add(paste);

  p3.add(cut);

  

  //Add an event listening mechanism 

  copy.addActionListener(this);

  paste.addActionListener(this);

  cut.addActionListener(this);

  

  // this.copyStr(copy);

  jf.add(p1, BorderLayout.NORTH);

  jf.add(p2, BorderLayout.CENTER);

  jf.add(p3, BorderLayout.SOUTH);

  jf.setLocation(400,200);

  jf.setSize(600,450);

  jf.setResizable(false);

  jf.setVisible(true);

 }

 

 //Event handling 

 public void actionPerformed(ActionEvent e)

 {

  if(e.getSource() == copy)

  {

   String tempText = edit.getSelectedText();  //Drag the mouse to select text 

   //Creates a spring that can transfer a specified String. < br / >
   StringSelection editText = 

     new StringSelection(tempText);

   /**

    Sets the current contents of the clipboard to the specified  transferable  Object, 

    And registers the specified clipboard owner as the owner of the new content. 

   */

   clipboard.setContents(editText,null);

  }else if(e.getSource() == cut)

  {

   String tempText = edit.getSelectedText();

   StringSelection editText = 

     new StringSelection(tempText);

   clipboard.setContents(editText,null);

   int start= edit.getSelectionStart();

   int end  = edit.getSelectionEnd(); 

   showMsg.replaceRange("",start,end) ; //Delete the selected text from Text1. < br / >
  }else if(e.getSource() == paste)

  {

   Transferable contents = clipboard.getContents(this);

     DataFlavor  flavor= DataFlavor.stringFlavor;

      if( contents.isDataFlavorSupported(flavor))

      {

     try

     {  

      String str;

      str = (String)contents.getTransferData(flavor);

      showMsg.append(str);

     }catch(Exception ex)

     {

      ex.printStackTrace();

     }

      }

  }

 }

 

 public static void main(String[] args)

 {

  new Demo();

 }

}

The code is simple and easy to use. If you have a better idea, please tell me.