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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...
Spring Boot: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFa
...
I'm doing all the tutorials into one Eclipse project ending up with one giant pom. I put it in a seperate project using the pom from the tutorial and now it works perfectly. Thanks for your help! What if I want a scheduler in a Spring webapp using this API?...
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 ...
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...
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...
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)
$doc.root.on...
Difference between Python's Generators and Iterators
..., but not vice versa. A generator is built by calling a function that has one or more yield expressions (yield statements, in Python 2.5 and earlier), and is an object that meets the previous paragraph's definition of an iterator.
You may want to use a custom iterator, rather than a generator, when...
How can one see the structure of a table in SQLite? [duplicate]
...
one common mistake here is confusing these utility functions with sql statements.. the former doesn't require a ; at the end of the command where as the latter does.
– abbood
Jun 26 '13 ...
Regular expression for letters, numbers and - _
...int "$s is NO match!!!\n";
};
}
?>
The above prints (as seen on ideone.com):
screen123.css is a match
screen-new-file.css is a match
screen_new.js is a match
screen new file.css is NO match!!!
Note that the pattern is slightly different, using \w instead. This is the character class for "...