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JPA: How to have one-to-many relation of the same Entity type
... Collection<A> children;
// Getters, Setters, serialVersionUID, etc...
}
Here's a rough main() method that persists three such entities:
public static void main(String[] args) {
EntityManager em = ... // from EntityManagerFactory, injection, etc.
em.getTransaction().begin();
...
CMake output/build directory
...relative to CMAKE_BINARY_DIR, CMAKE_CURRENT_BINARY_DIR, PROJECT_BINARY_DIR etc.
If you look at CMake documentation, you'll see variables partitioned into semantic sections. Except for very special circumstances, you should treat all those listed under "Variables that Provide Information" as read-on...
What are the big improvements between guava and apache equivalent libraries?
We currently use apache collections, string utils, etc. I need to decide if we should switch from the apache foundations implementation.
...
Pros and cons of AppSettings vs applicationSettings (.NET app.config / Web.config)
...simpler. If you only need a couple of literal values (bools, ints, string, etc) then this approach gives the most bang for the buck. If you need structured data, namespace separation, XSD supported validation/completion, etc, then a custom section might be a better fit. Another option is to ignore t...
Uses for Optional
...sirable" ways (e.g. as method parameters, in collections, in constructors, etc.) if that really is not intended usage?
– skomisa
Feb 20 '15 at 0:33
...
Shortest distance between a point and a line segment
...ass vec2 {float x,y;}, essentially, with operators to add, subract, scale, etc, and a distance and dot product function (i.e. x1 x2 + y1 y2).
float minimum_distance(vec2 v, vec2 w, vec2 p) {
// Return minimum distance between line segment vw and point p
const float l2 = length_squared(v, w); /...
How to securely store access token and secret in Android?
I am going to use oAuth to fetch mails and contacts from google. I don't want to ask the user each time to log in to obtain an access token and secret. From what I understood, I need to store them with my application either in a database or SharedPreferences . But I am a bit worried about security ...
Is there a difference between copy initialization and direct initialization?
...ed temporary. Any members of c1 that have pod-type (or members of members, etc., etc.) may not be initialized if the user supplied default constructors (if any) do not explicitly initialize them. For c2, it depends on whether there is a user supplied copy constructor and whether that appropriately i...
Qt events and signal/slots
...e the button should function like a normal QPushButton (it can be clicked, etc). In Qt this is done by creating your own little reusable "component" (subclass of QPushButton), which reimplements QWidget::keyPressEvent. Pseudocode:
class NumericButton extends QPushButton
private void addToNumber...
How to make an Android Spinner with initial text “Select One”?
...nerAdapter) java.lang.reflect.Proxy.newProxyInstance(
obj.getClass().getClassLoader(),
new Class[]{SpinnerAdapter.class},
new SpinnerAdapterProxy(obj));
}
/**
* Intercepts getView() to display the prompt if position < 0
*/
p...