[Demonstration 1]

[Buggy Method]
@Override
public void beginContact(Contact contact) {
    Object a = contact.getFixtureA().getBody().getUserData();
    Object b = contact.getFixtureB().getBody().getUserData();
    if (a == null || b == null)
        return;
    if ((a instanceof Player && b instanceof Ground) || (a instanceof Ground && b instanceof Player)) {
        Player player;
        if (a instanceof Play) {
            player = (Player) a;
        } else {
            player = (Player) b;
        }
        player.setCanJump(true);
    }
}

[Buggy Hunk]
if ((a instanceof Player && b instanceof Ground) || (a instanceof Ground && b instanceof Player)) {

[Patch]
if ((a instanceof Player && b instanceof Level.Ground) || (a instanceof Level.Ground && b instanceof Player)) {

[Demonstration 2]

[Buggy Method]
public void dealCards(final int numberOfCards, final List<Player> players) {
    shuffleCards();
    for (int b = 1; b <= numberOfCards; b++) {
        for (final Player player : players) {
            if (!player.isFolded()) {
                player.addCard(cards.get(0));
                cards.remove(0);
            }
        }
    }
}

[Buggy Hunk]
if(!player.isFolded()){

[Patch]
if(!player.isFolded() && player.isInGame()){

[Demonstration 3]

[Buggy Method]
public void draw(SpriteBatch batch, Vector2 playerPos, Vector2 screenRes) {
    batch.draw(sprite, x - playerPos.x - screenRes.x / 2, y - playerPos.y - screenRes.y / 2, sprite.getRegionWidth(), sprite.getRegionHeight());
}

[Buggy Hunk]
batch.draw(sprite, x - playerPos.x - screenRes.x / 2, y - playerPos.y - screenRes.y / 2, sprite.getRegionWidth(), sprite.getRegionHeight());

[Patch]
batch.draw(sprite, x - playerPos.x + screenRes.x / 2, y - playerPos.y + screenRes.y / 2, sprite.getRegionWidth(), sprite.getRegionHeight());