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Singleton with Arguments in Java
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You can add a configurable initialization method in order to separate instantiation from getting.
public class Singleton {
private static Singleton singleton = null;
private final int x;
private Singleton(int x) {
this.x = x;
}
public static Sing...
How do I format a long integer as a string without separator in Java?
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@RAnders00 btw using a message format is an order of magnitude more expensive, and more complicated in this case.
– Peter Lawrey
Jan 23 '16 at 19:36
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How to hide columns in HTML table?
...l hold the space. For the div tags you would have to use display: none; in order to truly collapse and not hold the space.
– Dov Miller
Apr 3 '16 at 11:30
5
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How to sort a list in Scala by two fields?
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@SachinK: you have to create your own Ordering for Row class and use it with sorted method like this: rows.sorted(customOrdering). You could also use custom Ordering for Tuple2 like this: rows.sortBy(r => (r.lastName, r.firstName))( Ordering.Tuple2(Ordering.St...
Changing the image source using jQuery
...will work with 2, 3, 5, 10, or 100 images... cycling through each image in order and restarting at the first image when the last image is reached.
Additionally, .attr() is used to get and set the "src" attribute of the images. To pick elements from among the $images object, I set $images as the jQu...
How to add custom method to Spring Data JPA
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Im using the following code in order to access generated find methods from my custom implementation. Getting the implementation through the bean factory prevents circular bean creation problems.
public class MyRepositoryImpl implements MyRepositoryExtensi...
How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g
...ython implementation detail: Objects of different types except numbers are ordered by their type names; objects of the same types that don’t support proper comparison are ordered by their address.
When you order two strings or two numeric types the ordering is done in the expected way (lexicogra...
How to emulate GPS location in the Android Emulator?
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Mind the order, lon before lat!
– Christoph
Apr 14 '14 at 21:48
15
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When NOT to call super() method when overriding?
....save() will perform the save() logic for both A and B, in this particular order. If you weren't calling super.save() inside B.save(), A.save() wouldn't be called. And if you called super.save() after save(b), A.save() would be effectively performed afterwards B.save().
If you want to override supe...
Java executors: how to be notified, without blocking, when a task completes?
...y to wait for several threads to complete execution before continuing.
In order to achieve the callback effect you're looking after, that does require a little additional extra work. Namely, handling this by yourself in a separate thread which uses the CountDownLatch and does wait on it, then goes ...