MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;

public class MainClass {
    public static void main(String args[]) throws Exception {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextField nameTextField = new JTextField();
        frame.add(nameTextField, BorderLayout.NORTH);

        KeyListener keyListener = new KeyListener() {
            public void keyPressed(KeyEvent keyEvent) {
                printIt("Pressed", keyEvent);
            }

            public void keyReleased(KeyEvent keyEvent) {
                printIt("Released", keyEvent);
            }

            public void keyTyped(KeyEvent keyEvent) {
                printIt("Typed", keyEvent);
            }

            private void printIt(String title, KeyEvent keyEvent) {
                int keyCode = keyEvent.getKeyCode();
                String keyText = KeyEvent.getKeyText(keyCode);
                System.out.println(title + " : " + keyText + " / " + keyEvent.getKeyChar());
            }
        };
        nameTextField.addKeyListener(keyListener);

        frame.setSize(250, 100);
        frame.setVisible(true);
    }
}