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How to find the JVM version from a program?
... Worth noting that the Java 9 will change the returned value from this string.
– AlBlue
Apr 20 '16 at 19:12
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How can I return NULL from a generic method in C#?
...that if you're using this generic method to say, convert a Database object from DbNull to Int and it returns default(T) where T is an int, it'll return 0. If this number is actually meaningful, then you'd be passing around bad data in cases where that field was null. Or a better example would be a D...
How do I strip non alphanumeric characters from a string and keep spaces?
... nil if nothing was matched. Probably not the result you'd want or expect. From the docs "Performs the substitutions of String#gsub in place, returning str, or nil if no substitutions were performed. If no block and no replacement is given, an enumerator is returned instead."
–...
How to access java-classes in the default-package?
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You can’t use classes in the default package from a named package.
(Technically you can, as shown in Sharique Abdullah's answer through reflection API, but classes from the unnamed namespace are not in scope in an import declaration)
Prior to J2SE 1.4 you could import c...
How to get distinct values from an array of objects in JavaScript?
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for typescript you have to use new Set wrapped in Array.from()... i will provide that answer below. @AngJobs
– Christian Matthew
Aug 25 '17 at 16:24
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Creating default object from empty value in PHP?
...$res = NULL;
$res->success = false; // Warning: Creating default object from empty value
PHP will report a different error message if $res is already initialized to some value but is not an object:
$res = 33;
$res->success = false; // Warning: Attempt to assign property of non-object
In o...
How to get a specific “commit” of a gem from github?
...ub.com/rails/rails.git', :tag => 'v2.3.5'
Source: How to install gems from git repositories
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Integrate ZXing in Android Studio
...ible in your app.
To start the Scanner afterwards, use this class/method:
From the Activity:
new IntentIntegrator(this).initiateScan(); // `this` is the current Activity
From a Fragment:
IntentIntegrator.forFragment(this).initiateScan(); // `this` is the current Fragment
// If you're using the ...
Difference between getContext() , getApplicationContext() , getBaseContext() and “this”
...ctivity.
ContextWrapper.getBaseContext(): If you need access to a Context from within another context, you use a ContextWrapper. The
Context referred to from inside that ContextWrapper is accessed via
getBaseContext().
sh...
Clearing purchases from iOS in-app purchase sandbox for a test user
...y, in your tester@gmail.com inbox you will receive two verification emails from Apple to confirm both test accounts.
Say that you have a non-consumable with product ID @"Extra_Levels". Instead of writing @"Extra_Levels" in all methods (requestProduct, purchaseProduct, ...), just write PRODUCT_ID1 an...