[Demonstration 1]

[Buggy Method]
public void run() {
    if (_count == 100) {
        _count = 0;
        userData.setPoints_earned(++points);
        myRef.child(mAuth.getCurrentUser().getUid()).child("point_remainder").setValue(_count);
        userData.setCount_remainder(_count);
        myRef.setValue(userData);
    }
    progress_heart.getBackground().setLevel(_count * 100);
}

[Buggy Hunk]
myRef.child(mAuth.getCurrentUser().getUid()).child("point_remainder").setValue(_count);

[Patch]
myRef.child("point_remainder").setValue(_count);

[Demonstration 2]

[Buggy Method]
@Test(expected = NullPointerException.class)
public void test_reservate_NullPointerException() {
    FlightService flightService = new FlightService();
    ReservatorModel reservation = flightService.reservate(null);
}

[Buggy Hunk]
ReservatorModel reservation = flightService.reservate(null);

[Patch]
ReservationModel reservation = flightService.reservate(456, null, null);

[Demonstration 3]

[Buggy Method]
public boolean hasHoney() {
    return this.honeyAmount != 0;
}

[Buggy Hunk]
return this.honeyAmount != 0;

[Patch]
return this.honeyAmount > 0;