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Why does ConcurrentHashMap prevent null keys and values?
The JavaDoc of ConcurrentHashMap says this:
7 Answers
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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...
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...
Commonly accepted best practices around code organization in JavaScript [closed]
As JavaScript frameworks like jQuery make client side web applications richer and more functional, I've started to notice one problem...
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What is a Manifest in Scala and when do you need it?
...Scala 2.7.2 there is something called Manifest which is a workaround for Java's type erasure. But how does Manifest work exactly and why / when do you need to use it?
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Android : Check whether the phone is dual SIM
...able now from Android 5.1 onwards
Other possible option :
You can use Java reflection to get both IMEI numbers.
Using these IMEI numbers you can check whether the phone is a DUAL SIM or not.
Try following activity :
import android.app.Activity;
import android.os.Bundle;
import android.wid...
Adding up BigDecimals using Streams
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Java standard library already have functions for summing integers/doubles like Collectors.summingInt(), but misses them for BigDecimals. Instead of writing reduce(blah blah blah) that is hard to read it would be better to wri...
How to convert latitude or longitude to meters?
.../ formula to convert that reading to meters, which I can then implement in Java (J9)?
15 Answers
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What is stdClass in PHP?
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stdClass is PHP's generic empty class, kind of like Object in Java or object in Python (Edit: but not actually used as universal base class; thanks @Ciaran for pointing this out).
It is useful for anonymous objects, dynamic properties, etc.
An easy way to consider the StdClass is as ...
Convert Bitmap to File
...tputStream is how you write to a file. See developer.android.com/reference/java/io/FileOutputStream.html
– Torid
Oct 14 '11 at 17:08
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