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Should the hash code of null always be zero, in .NET
...code.
Returning 0 or -1 for null, so long as you choose one and return it all the time, will work. Obviously, non-null hash codes should not return whatever value you use for null.
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GetHashCode on null fields?
What should GetHashCode return when object's identifier is null?
Th...
How to convert a Map to List in Java?
...nvert a Map<key,value> to a List<value> ? Just iterate over all values and insert them in a list or am I overlooking something?
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How to copy a file to multiple directories using the gnu cp command
...args -n 1 cp file1
Will copy file1 to dir1, dir2, and dir3. xargs will call cp 3 times to do this, see the man page for xargs for details.
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How to detect escape key press with pure JS or jQuery?
...cated as of jQuery 3.0... you should use .off
– freefaller
Apr 24 '18 at 14:07
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A route named “x” is already in the route collection. Route names must be unique. Exception with ASP
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To fix this problem I had to go into the bin folder on my project, delete all DLL files and then rebuild and this fixed the problem.
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Android - how do I investigate an ANR?
...ocking operations from within the event thread. You should make sure these all happen in separate threads. If nothing seems the problem, use DDMS and enable the thread view. This shows all the threads in your application similar to the trace you have. Reproduce the ANR, and refresh the main thread a...
Java ArrayList copy
...a reference) to l2. They will both refer to the same object.
Creating a shallow copy is pretty easy though:
List<Integer> newList = new ArrayList<>(oldList);
(Just as one example.)
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Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
... which makes the original array available as a list. Nothing is copied and all, only a single wrapper object is created. Operations on the list wrapper are propagated to the original array. This means that if you shuffle the list wrapper, the original array is shuffled as well, if you overwrite an e...
AddRange to a Collection
...erfectly reasonable. There is a List<T>.AddRange() method that basically does just this, but requires your collection to be a concrete List<T>.
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Overload with different return type in Java?
... alone is not sufficient for the compiler to figure out which function to call:
public int foo() {...}
public float foo() {..}
...
foo(); // which one?
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