Key Handler

Question

//My source code:
package keyhandler;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.swing.JFrame;
public class Handler implements KeyListener {
private boolean FINISH = true;
private Set<Integer> set;
*@param args*
public Handler() {
set = Collections.synchronizedSet(new HashSet<Integer>());
public void handle() {
while (FINISH) {
synchronized (set) {
Iterator<Integer> i = set.iterator();
String k= "";
while (i.hasNext()) {
int key = i.next();
switch (key) {
case 27: FINISH=false;break;
case 38:k = k.concat(" Up");break;
case 39:k = k.concat(" right");break;
case 40:k = k.concat(" down");break;
case 37:k = k.concat(" left");break;
default :k = k.concat(" "+key);break;
System.out.println(k);
System.exit(0);
public static void main(String[] args) {
Handler handler = new Handler();
JFrame frame = new JFrame();
frame.setVisible(true);
frame.addKeyListener(handler);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
handler.handle();
@Override
public void keyPressed(KeyEvent arg0) {
synchronized (set) {
set.add(arg0.getKeyCode());
@Override
public void keyReleased(KeyEvent arg0) {
synchronized (set) {
set.remove(arg0.getKeyCode());
@Override
public void keyTyped(KeyEvent arg0) {
// TODO Auto-generated method stub
// I 've got this code to handle keys. I am making an interface for a game and I would like to handle more than one key at same time. I want to handle the arrow keys. It seems to be fine except when I am holding down the Up arrow key i can hold just another key at same time.
Example :
Down Left Right - holding down left and right arrow key at same time
Up left - with up arrow key i can hold just another one key. Not more.
Can anybody help me to sort out this source?

Answer 1

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