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How to remove all null elements from a ArrayList or String Array?
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Try:
tourists.removeAll(Collections.singleton(null));
Read the Java API. The code will throw java.lang.UnsupportedOperationException for immutable lists (such as created with Arrays.asList); see this answer for more details.
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What is the best way to compute trending topics or tags?
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This problem calls for a z-score or standard score, which will take into account the historical average, as other people have mention, but also the standard deviation of this historical data, making it more robust than just using the avera...
Break a previous commit into multiple commits
...t recent commit, first:
$ git reset HEAD~
Now commit the pieces individually in the usual way, producing as many commits as you need.
B) Splitting a commit farther back
This requires rebasing, that is, rewriting history. To find the correct commit, you have several choices:
If it was three co...
How do you use the “WITH” clause in MySQL?
I am converting all my SQL Server queries to MySQL and my queries that have WITH in them are all failing. Here's an example:
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How can I put strings in an array, split by new line?
...ength=8)
Note that you have to use a double-quoted string, so \n is actually interpreted as a line-break.
(See that manual page for more details.)
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How to implement Enums in Ruby?
...Jun 20 '12 at 15:44
Andrew Marshall
87.3k1818 gold badges202202 silver badges204204 bronze badges
answered Sep 16 '08 at 19:32
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How to validate a url in Python? (Malformed or not)
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Actually, I think this is the best way.
from django.core.validators import URLValidator
from django.core.exceptions import ValidationError
val = URLValidator(verify_exists=False)
try:
val('http://www.google.com')
except Val...
Background color not showing in print preview
...ings can be done to avoid the difficulties you are having. First, separate all your print CSS from your screen CSS. This is done via the @media print and @media screen.
Often times just setting up some extra @media print CSS is not enough because you still have all your other CSS included when prin...
What does the [Flags] Enum Attribute mean in C#?
... Such collections are often used with bitwise operators, for example:
var allowedColors = MyColor.Red | MyColor.Green | MyColor.Blue;
Note that the [Flags] attribute doesn't enable this by itself - all it does is allow a nice representation by the .ToString() method:
enum Suits { Spades = 1, Clu...
Find TODO tags in Eclipse
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Is there an easy way to view all methods which contain this comment? Some sort of menu option?
Yes, choose one of the following:
1) Go to Window → Show View → Tasks(Not TaskList). The new view will show up where the "Console" and "Problems" tabs ...