Nefunguje KeyListener – Java – Fórum – Programujte.com

Jak to, že mi nejde KeyListener?

package klavesnice;

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class kl3 implements KeyListener {
	
	static JLabel lab=new JLabel();
	
	 public static void main(String args[]) {
		 
		 JFrame frame=new JFrame();
		 frame.setSize(200, 200);
		 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		 lab.setText("normální stav");
		 frame.add(lab);
		 frame.setVisible(true);
		 
	 }

	@Override
	public void keyPressed(KeyEvent e) {
		if (e.getKeyChar() == 'a') {
			 lab.setText("po stisknutí");
		 }
	}

	@Override
	public void keyReleased(KeyEvent e) {
		if (e.getKeyChar() == 'a') {
			 lab.setText("po stisknutí");
			
		 }
	}

	@Override
	public void keyTyped(KeyEvent e) {
		 if (e.getKeyChar() == 'a') {
			 lab.setText("po stisknutí");
		 }
	}

}

niekde do vnutra framu daj frame.addKeyListener(this), alebo nieco v tom zmysle. Ty si ho vytvoril ale potom uz si ho nepridal ziadnemu komponentu. Tu to mas pekne http://stackoverflow.com/questions/286727/java-keylistener-for-jframe-is-being-unresponsive