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What is a stack trace, and how can I use it to debug my application errors?
...ot more. What we're mostly concerned about is looking for methods that are from our code, which would be anything in the com.example.myproject package. From the second example (above), we'd first want to look down for the root cause, which is:
Caused by: java.sql.SQLException
However, all the met...
How to center a Window in Java?
...
From this link
If you are using Java 1.4 or newer,
you can use the simple method
setLocationRelativeTo(null) on the
dialog box, frame, or window to center
it.
...
Long vs Integer, long vs int, what to use and when?
...d use long and int, except where you need to make use of methods inherited from Object, such as hashcode. Java.util.collections methods usually use the boxed (Object-wrapped) versions, because they need to work for any Object, and a primitive type, like int or long, is not an Object.
Another differ...
Why do Java webapps use .do extension? Where did it come from?
...estions%2f3597582%2fwhy-do-java-webapps-use-do-extension-where-did-it-come-from%23new-answer', 'question_page');
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...
C++ static virtual members?
...you use the class instead of an object, it would naturally use the version from that class, instead of doing virtual-dispatch. Nothing new there.
– Deduplicator
Feb 2 '15 at 22:17
...
Weird “[]” after Java method signature
...at's a funny Question.
In java you can say int[] a;, as well as int a[];.
From this perspective, in order to get the same result just need to move the [] and write public int[] get() {. Still looks like the code came from an obfuscator...
...
How do Google+ +1 widgets break out of their iframe?
...Why not just generate a div on the page? Well because the link originates from the iframe, a CSRF (cross-site request forgery) token can be embedded in the request and the parent site cannot read this token and forge the request. So the iframe is an anti-CSRF measure that relies upon the Origin In...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
... if the execution of the program went good or bad. It's a sort of heredity from older programming languages where it's useful to know if something went wrong and what went wrong.
Exit code is
0 when execution went fine;
1, -1, whatever != 0 when some error occurred, you can use different values f...
Django datetime issues (default=datetime.now())
...
Instead of using datetime.now you should be really using from django.utils.timezone import now
Reference:
Documentation for django.utils.timezone.now
so go for something like this:
from django.utils.timezone import now
created_date = models.DateTimeField(default=now, editab...
Setting direction for UISwipeGestureRecognizer
...nizer).
Filed a bug report (#8276386) to Apple.
[Update] I got an answer from Apple saying that the behavior works as was intended.
So for example in a table view you can swipe left or right in a table view cell to trigger 'delete' (this would have directions of the swipe gesture set to left and ...