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How to map a composite key with JPA and Hibernate?
In this code, how to generate a Java class for the composite key (how to composite key in hibernate):
8 Answers
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Test if lists share any items in python
...(such as the built-in one). I assumed it required randomishness, like the Java one, which results in monstrousities like this stackoverflow.com/questions/2634690/… . I need to keep reminding myself that Python Is Not Java (thank deity!).
– fmark
Jul 3 '10 at...
What is tail call optimization?
...rantee in the spec that any implementation must provide this optimization (JavaScript does also, starting with ES6), so here are two examples of the factorial function in Scheme:
(define (fact x)
(if (= x 0) 1
(* x (fact (- x 1)))))
(define (fact x)
(define (fact-tail x accum)
(if (=...
Android: Vertical ViewPager [closed]
...e are also helpful for understanding what is happening.
VerticalViewPager.java
import android.support.v4.view.ViewPager;
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
this(context, null);
}
public VerticalViewPager(Context...
Is it possible to move/rename files in Git and maintain their history?
... Important: if you rename a directory, for example during renaming of a Java package, be sure to execute two commits, first for the 'git mv {old} {new}' command, second for the updates of all Java files that reference the changed package directory. Otherwise git can't track the individual files e...
return, return None, and no return at all?
...basically the same as return in void functions in languages such as C++ or Java.
In the following example, we set person's mother's name and then the function exits after completing successfully.
def set_mother(person, mother):
if is_human(person):
person.mother = mother
Note: You sh...
What's the best CRLF (carriage return, line feed) handling strategy with Git?
...d perform LF normalization
* text=auto
*.cs text diff=csharp
*.java text diff=java
*.html text diff=html
*.css text
*.js text
*.sql text
*.csproj text merge=union
*.sln text merge=union eol=crlf
*.docx diff=astextplain
*.DOCX diff=astextplain
# absolute paths are ...
Interface vs Base class
...
Well, Josh Bloch said himself in Effective Java 2d:
Prefer interfaces over abstract classes
Some main points:
Existing classes can be easily retrofitted to implement a new
interface. All you have to do is add
the required methods if they don’t yet
exi...
How to use support FileProvider for sharing content to other apps?
...lt;files-path name="app_directory" path="directory/"/>
</paths>
Java:
public static void sendFile(Context context) {
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
String dirpath = context.getFilesDir() + File.separator + "directory";
File f...
Tooltips for cells in HTML table (no Javascript)
Is it possible to have tooltips for table cells with no JavaScript. Can't use it.
6 Answers
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