Handling Key Presses : KeyListener « Swing Event « Java Tutorial

1. Java Tutorial
2. Swing Event
3. KeyListener

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JFrame;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] argv) throws Exception {
    JTextField component = new JTextField();
    component.addKeyListener(new MyKeyListener());

    JFrame f = new JFrame();

    f.add(component);
    f.setSize(300, 300);
    f.setVisible(true);

  }
}

class MyKeyListener extends KeyAdapter {
  public void keyPressed(KeyEvent evt) {
    if (evt.getKeyChar() == 'a') {
      System.out.println("Check for key characters: " + evt.getKeyChar());
    }
    if (evt.getKeyCode() == KeyEvent.VK_HOME) {
      System.out.println("Check for key codes: " + evt.getKeyCode());
    }
  }
}

15.21.KeyListener
	15.21.1.	The KeyListener Interface
	15.21.2.	The event IDs that the KeyEvent class defines
	15.21.3.	How to Write a Key Listener
	15.21.4.	Demonstrates key events
	15.21.5.	KeyListener and KeyEvent
	15.21.6.	Handling Key Presses
	15.21.7.	Get key pressed as a key character (which is a Unicode character)
	15.21.8.	Get key pressed as a key code
	15.21.9.	Setting Focus Traversal Keys in a Component
	15.21.10.	Listing the Key Bindings in a Component
	15.21.11.	Make the ENTER key act like the TAB key
	15.21.12.	Overriding Many Default Typed Key Bindings in a JTextComponent