I was exploring the folders and found my college project. I thought let me write article for old school project. It might help students working for first time in java swing. Its very easy to implement Cut, Copy, Paste, Undo, Redo when you deal with text input(s).

I took jTextarea in this example. I'll give you core script but you have to modify the code as per your need. Like onclick event, KeyStroke, etc...

Code for handling cut event

 /* Below code for netbeans */ 
 private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        jTextArea1.cut();
 }

 /* Below code when you want to attach action listener */
 class cut implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            jTextArea1.cut();
        }
 }

 /* Below code for netbeans */ 
 private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        jTextArea1.copy();
 }

 /* Below code when you want to attach action listener */
 class copy implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            jTextArea1.copy();
        }
 }

 /* Below code for netbeans */ 
 private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
        jTextArea1.paste();
 }

 /* Below code when you want to attach action listener */
 class paste implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            jTextArea1.paste();
        }
 }

import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.UndoManager;

/* Create global variable */
UndoManager undo = new UndoManager();

jTextArea1.getDocument().addUndoableEditListener(
                new UndoableEditListener() {
                    public void undoableEditHappened(UndoableEditEvent e) {
                        undo.addEdit(e.getEdit());
                }
});

 /* Below code for netbeans */ 
 private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
        try {
            undo.undo();
        } catch (CannotRedoException cre) {
            cre.printStackTrace();
        }
 }

 /* Below code when you want to attach action listener */
 class undo implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            try {
               undo.undo();
            } catch (CannotRedoException cre) {
               cre.printStackTrace();
            }
        }
 }

 /* Below code for netbeans */ 
 private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {
        try {
            undo.redo();
        } catch (CannotRedoException cre) {
            cre.printStackTrace();
        }
 }

 /* Below code when you want to attach action listener */
 class redo implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            try {
               undo.redo();
            } catch (CannotRedoException cre) {
               cre.printStackTrace();
            }
        }
 }