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Rename package in Android Studio
... First create a new package with the desired name by right clicking on the Java folder → New → Package.
Then, select and drag all your classes to the new package. Android Studio will refactor the package name everywhere.
Finally, delete the old package.
Done.
Very important:
You have to man...
Strangest language feature
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In JavaScript:
'5' + 3 gives '53'
Whereas
'5' - 3 gives 2
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edited Sep 21 '10 at 10:21
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Using Enum values as String literals
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JavaDoc: String java.lang.Enum.name() Returns the name of this enum constant, exactly as declared in its enum declaration. Most programmers should use the toString method in preference to this one, as the toString method ma...
scheduleAtFixedRate vs scheduleWithFixedDelay
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If you read the Java Doc it will be clearer
ScheduledFuture scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit)
Creates and executes a periodic action that becomes enabled first after the given initial de...
What components are MVC in JSF MVC framework?
... tree
V - Rendered HTML output
C - Client (webbrowser)
In the yet smaller JavaScript picture, the client V is in turn dividable as below:
M - HTML DOM tree
V - Visual presentation
C - Event listener functions (enduser interaction and Ajax)
So it's basically a M(M(M(MVC)C)C)C ;)
Note that some st...
What are the pros and cons of performing calculations in sql vs. in your application
...engine is likely to have a more efficient decimal arithmetic routines than Java.
Generally though for row level calculations there is not much difference.
Where it does make a difference is:
Aggregate calculations like SUM(), AVG(),MIN(), MAX() here the database engine will be an order of magnit...
Why does ConcurrentHashMap prevent null keys and values?
The JavaDoc of ConcurrentHashMap says this:
7 Answers
7
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How do you create a static class in C++?
... // etc.
}
But you must remember that "static classes" are hacks in the Java-like kind of languages (e.g. C#) that are unable to have non-member functions, so they have instead to move them inside classes as static methods.
In C++, what you really want is a non-member function that you'll declar...
Context switches much slower in new linux kernels
..., 0x601ac0, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
0.000125 futex(0x7f98ce4c0b88, FUTEX_WAKE_PRIVATE, 2147483647) = 0
0.000042 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000038 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000037 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000030 futex(0x...
What does @hide mean in the Android source code?
...ype is a collection of classes and methods that are marked with the @hide Javadoc attribute.
Starting from Android 9 (API level 28), Google introduces new restrictions on the use of non-SDK interfaces, whether directly, via reflection, or via JNI. These restrictions are applied whenever an app re...