Space Invaders - Input

package net.jnk.Unknown;

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

public class Input implements KeyListener, FocusListener{

    public static boolean[] buttons = new boolean[32];

    private static final int LEFT = 0;
    private static final int RIGHT = 1;
    private static final int FIRE = 2;
    private static final int EXIT = 3;
    private static final int DEBUG = 4;

    @Override
    public void keyPressed(KeyEvent e) {
        try {
            int button = -1;

            int keyID = e.getKeyCode();

            if (keyID == KeyEvent.VK_A) button = LEFT;
            if (keyID == KeyEvent.VK_LEFT) button = LEFT;
            if (keyID == KeyEvent.VK_D) button = RIGHT;
            if (keyID == KeyEvent.VK_RIGHT) button = RIGHT;
            if (keyID == KeyEvent.VK_SPACE) button = FIRE;
            if (keyID == KeyEvent.VK_ESCAPE) button = EXIT;
            if (keyID == KeyEvent.VK_F3) button = DEBUG;

            buttons[button] = true;
        } catch(ArrayIndexOutOfBoundsException ex) {
            // Ignore the error
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
        try {
            int button = -1;

            int keyID = e.getKeyCode();

            if (keyID == KeyEvent.VK_A) button = LEFT;
            if (keyID == KeyEvent.VK_LEFT) button = LEFT;
            if (keyID == KeyEvent.VK_D) button = RIGHT;
            if (keyID == KeyEvent.VK_RIGHT) button = RIGHT;
            if (keyID == KeyEvent.VK_SPACE) button = FIRE;
            if (keyID == KeyEvent.VK_ESCAPE) button = EXIT;
            if (keyID == KeyEvent.VK_F3) button = DEBUG;

            buttons[button] = false;
        } catch(ArrayIndexOutOfBoundsException ex) {
            // Ignore the error
        }
    }

    public void releaseAllKeys() {
        for(int i = 0; i < buttons.length; i++) {
            buttons[i] = false;
        }
    }

    @Override
    public void keyTyped(KeyEvent arg0) {
    }

    @Override
    public void focusGained(FocusEvent e) {
        Elements.hasFocus = true;
    }

    @Override
    public void focusLost(FocusEvent arg0) {
        Elements.hasFocus = false;
        releaseAllKeys();
    }
}