Cut, paste, and copy in a JTextField under program control in Java

/*from   w  w  w. j  av  a2  s  .c o m*/
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;

public class Main {
  JTextField jtf = new JTextField(15);
  JButton jbtnCut = new JButton("Cut");
  JButton jbtnPaste = new JButton("Paste");
  JButton jbtnCopy = new JButton("Copy");

  public Main() {
    JFrame jfrm = new JFrame("Cut, Copy, and Paste");
    jfrm.setLayout(new FlowLayout());
    jfrm.setSize(230, 150);
    jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    jbtnCut.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent le) {
        jtf.cut();
        update();
      }
    });

    jbtnPaste.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent le) {
        jtf.paste();
        update();
      }
    });

    jbtnCopy.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent le) {
        jtf.copy();
        update();
      }
    });

    jtf.addCaretListener(new CaretListener() {
      public void caretUpdate(CaretEvent ce) {
        update();
      }
    });

    jfrm.add(jtf);
    jfrm.add(jbtnCut);
    jfrm.add(jbtnPaste);
    jfrm.add(jbtnCopy);
    jfrm.setVisible(true);
  }

  private void update() {
    System.out.println("All text: " + jtf.getText());

    if (jtf.getSelectedText() != null)
      System.out.println("Selected text: " + jtf.getSelectedText());
    else
      System.out.println("Selected text: ");
  }

  public static void main(String args[]) {
    new Main();
  }
}