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Java Hashmap: How to get key from value?
...at the time of inserting the value into the map. This is easier said than done.
Once you can ensure that, use the entrySet() method to obtain the set of entries (mappings) in the Map. Once you have obtained the set whose type is Map.Entry, iterate through the entries, comparing the stored value aga...
What is a database transaction?
Can someone provide a straightforward (but not simpler than possible) explanation of a transaction as applied to computing (even if copied from Wikipedia)?
...
Google Maps: Auto close open InfoWindows?
... for me, because I am using an array of InfoWindow objects instead of just one that cycles through and grabs the pertinent info. Each InfoWindow has its own separately updating information, so I found this technique quite useful.
– InterfaceGuy
Jul 25 '12 at 21...
What is “git remote add …” and “git push origin master”?
... UNIX command line tools. You should consider taking some time off to read one of the many good git tutorials available online. The Pro Git book is a good place to start.
To answer your first question.
What is git remote add ...
As you probably know, git is a distributed version control system. Mos...
What are enums and why are they useful?
...ys use enums when a variable (especially a method parameter) can only take one out of a small set of possible values. Examples would be things like type constants (contract status: "permanent", "temp", "apprentice"), or flags ("execute now", "defer execution").
If you use enums instead of integers ...
Grep and Sed Equivalent for XML Command Line Processing
... functionality for reading and writing XML.
test.xml:
<root>
<one>I like applesauce</one>
<two>You sure bet I do!</two>
</root>
Powershell script:
# load XML file into local variable and cast as XML type.
$doc = [xml](Get-Content ./test.xml)
$doc.root.on...
How can I replace a newline (\n) using sed?
...ated label $!ba ($! means not to do it on the last line as there should be one final newline).
Finally the substitution replaces every newline with a space on the pattern space (which is the whole file).
Here is cross-platform compatible syntax which works with BSD and OS X's sed (as per @Benjie c...
How can one see the structure of a table in SQLite? [duplicate]
...
one common mistake here is confusing these utility functions with sql statements.. the former doesn't require a ; at the end of the command where as the latter does.
– abbood
Jun 26 '13 ...
How do I skip an iteration of a `foreach` loop?
... I would do if I had nested for loops, and wanted to skip the iteration of one of the extended ones?
for (int[] numbers in numberarrays) {
for (int number in numbers) { // What to do if I want to
// jump the (numbers/numberarrays)?
}
}
A continue always applies ...
Difference between Python's Generators and Iterators
..., but not vice versa. A generator is built by calling a function that has one or more yield expressions (yield statements, in Python 2.5 and earlier), and is an object that meets the previous paragraph's definition of an iterator.
You may want to use a custom iterator, rather than a generator, when...