[Demonstration 1]

[Buggy Method]
public void addEvent(Events events) {
    db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    String queryEvents = "select * from events";
    Cursor cursor = db.rawQuery(queryEvents, null);
    int countevent = cursor.getCount();
    values.put(COLUMN_EVENT_ID, countevent);
    values.put(COLUMN_HOST_ID, events.get_hid());
    values.put(COLUMN_INVITE_NUM, events.getInvite_num());
    values.put(COLUMN_AVAILABLE_INVITE_NUM, events.getAvailable_num());
    values.put(COLUMN_EVENT_NAME, events.getEvent_name());
    values.put(COLUMN_ADDRESS, events.getAddress());
    values.put(COLUMN_DESCRIPTION, events.getDescription());
    values.put(COLUMN_TIME, events.getTime());
    values.put(COLUMN_DATE, events.getDate());
    values.put(COLUMN_EVENT_PIC, events.getEvent_pic());
    //SQLiteDatabase db = getWritableDatabase();
    db.insert(TABLE_EVENTS, null, values);
    db.close();
}

[Buggy Hunk]
int countevent  = cursor.getCount();

[Patch]
int countevent  = cursor.getCount() + 1;

[Demonstration 2]

[Buggy Method]
private void initRes() {
    TowerDefense.mons = new HashSet<>();
    TowerDefense.towers = new HashSet<>();
    TowerDefense.shells = new HashSet<>();
    TowerDefense.gold = start_gold;
    TowerDefense.health = start_health;
    TowerDefense.vacant = mapBlock.clone();
    TowerDefense.ui = new UI();
    for (int i = 0; i < TowerDefense.towerTypeCount; i++) TowerDefense.ui.towerButton[i].addMouseListener(towerRegisters[i]);
    for (int i = 0; i < TowerDefense.row; i++) for (int j = 0; j < TowerDefense.column; j++) TowerDefense.ui.mapBlocks[i][j].addMouseListener(placeRegisters[i][j]);
}

[Buggy Hunk]
TowerDefense.ui = new UI();

[Patch]
TowerDefense.ui.Init();

[Demonstration 3]

[Buggy Method]
@NonNull
private List<String> getZonesFromContentProvider(ContentResolver contentResolver, Uri contentUri) {
    final List<String> zoneNames = new ArrayList<>();
    try (Cursor cursor = contentResolver.query(CONTENT_URI, null, null, null, null)) {
        if (cursor != null && cursor.moveToFirst()) {
            do {
                String zoneName = cursor.getString(cursor.getColumnIndex(CN_NAME));
                zoneNames.add(zoneName);
            } while (cursor.moveToNext());
        }
    }
    return zoneNames;
}

[Buggy Hunk]
try (Cursor cursor = contentResolver.query(CONTENT_URI, null, null, null, null)) {

[Patch]
try (Cursor cursor = contentResolver.query(contentUri, null, null, null, null)) {