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Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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How can I convert a DateTime to the number of seconds since 1970?
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That's basically it. These are the methods I use to convert to and from Unix epoch time:
public static DateTime ConvertFromUnixTimestamp(double timestamp)
{
DateTime origin = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
return origin.AddSeconds(timestamp);
}
public s...
When do I need to use AtomicBoolean in Java?
How I can use AtomicBoolean and what is that class for?
5 Answers
5
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What exceptions should be thrown for invalid or unexpected parameters in .NET?
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I like to use: ArgumentException, ArgumentNullException, and ArgumentOutOfRangeException.
ArgumentException – Something is wrong with the argument.
ArgumentNullException – Argument is null.
ArgumentOutOfRangeException – I don’t use this one much, but a common use is index...
Extract hostname name from string
I would like to match just the root of a URL and not the whole URL from a text string. Given:
27 Answers
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Intersection and union of ArrayLists in Java
...ut using any third-party library. Main advantage over retainAll, removeAll and addAll is that these methods don't modify the original lists input to the methods.
public class Test {
public static void main(String... args) throws Exception {
List<String> list1 = new ArrayList<...
Github Windows 'Failed to sync this branch'
I am using Github Windows 1.0.38.1 and when I click the 'Sync' button after committing, I get the error
17 Answers
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Explain Morris inorder tree traversal without using stacks or recursion
Can someone please help me understand the following Morris inorder tree traversal algorithm without using stacks or recursion ? I was trying to understand how it works, but its just escaping me.
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Are Javascript arrays sparse?
...se array, you should call the constructor with an explicit length argument and hope you'll actually get one.
See this answer for a more detailed description by olliej.
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How to search for file names in Visual Studio?
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Just for anyone else landing on this page from Google or elsewhere, this answer is probably the best answer out of all of them.
To summarize, simply hit:
CTRL + ,
And then start typing the file name.
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