The document provides a Java implementation of a keylogger GUI application. It uses JFrame to create a text field that captures key events, such as key typed, pressed, and released. The key events are displayed in the console with the corresponding key character or code.

1. import java.awt.FlowLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class KeyLogger extends JFrame implements KeyListener {
public static void main(String[] args) {
new KeyLogger().draw();
}
private void draw() {
setLayout(new FlowLayout());
JTextField field = new JTextField(20);
add(field);
setSize(500, 500);
setVisible(true);
field.addKeyListener(this);
}
public void keyTyped(KeyEvent e) {
display(e, "KEY TYPED: ");
}
public void keyPressed(KeyEvent e) {
display(e, "KEY PRESSED: ");
}
public void keyReleased(KeyEvent e) {
display(e, "KEY RELEASED: ");
}
private void display(KeyEvent e, String keyStatus) {
int id = e.getID();
String keyString;
if (id == KeyEvent.KEY_TYPED) {
char c = e.getKeyChar();
keyString = "key character = '" + c + "'";
} else {
int keyCode = e.getKeyCode();
keyString = "key code = " + keyCode + " (" + KeyEvent.getKeyText(keyCode) + ")";

2. }
System.out.println(keyString);
}
}
Solution
import java.awt.FlowLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class KeyLogger extends JFrame implements KeyListener {
public static void main(String[] args) {
new KeyLogger().draw();
}
private void draw() {
setLayout(new FlowLayout());
JTextField field = new JTextField(20);
add(field);
setSize(500, 500);
setVisible(true);
field.addKeyListener(this);
}
public void keyTyped(KeyEvent e) {
display(e, "KEY TYPED: ");
}
public void keyPressed(KeyEvent e) {
display(e, "KEY PRESSED: ");
}
public void keyReleased(KeyEvent e) {
display(e, "KEY RELEASED: ");
}
private void display(KeyEvent e, String keyStatus) {
int id = e.getID();
String keyString;

3. if (id == KeyEvent.KEY_TYPED) {
char c = e.getKeyChar();
keyString = "key character = '" + c + "'";
} else {
int keyCode = e.getKeyCode();
keyString = "key code = " + keyCode + " (" + KeyEvent.getKeyText(keyCode) + ")";
}
System.out.println(keyString);
}
}