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how to append a list object to another
..., I have two list<T> objects A and B and I want to add all the members of B to the end of A . I've searched a few different sources and haven't found a simple solution (e.i. A.append(B); ) and this surprises me a bit.
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Java Singleton and Synchronization
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Yes, it is necessary. There are several methods you can use to achieve thread safety with lazy initialization:
Draconian synchronization:
private static YourObject instance;
public static synchronized YourObject getInstance() {
if (instance == null) {
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Comparing numbers in Bash
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In bash, you should do your check in arithmetic context:
if (( a > b )); then
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fi
For POSIX shells that don't support (()), you can use -lt and -gt.
if [ "$a" -gt "$b" ]; then
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fi
You can get a full list of comparison operators with help test o...
How do I clear my local working directory in Git? [duplicate]
...ed changes in a specific file):
git checkout thefiletoreset.txt
This is mentioned in the git status output:
(use "git checkout -- <file>..." to discard changes in working directory)
To reset the entire repository to the last committed state:
git reset --hard
To remove untracked files,...
Best practice: ordering of public/protected/private within the class definition?
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In Clean Code, Robert C. Martin advises coders to always put member variables at the top of the class (constants first, then private members) and methods should be ordered in such a way so that they read like a story that doesn't cause the reader to need to jump around the code too muc...
How to get multiple counts with one SQL query?
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You can use a CASE statement with an aggregate function. This is basically the same thing as a PIVOT function in some RDBMS:
SELECT distributor_id,
count(*) AS total,
sum(case when level = 'exec' then 1 else 0 end) AS ExecCount,
sum(cas...
Spring MVC: Complex object as GET @RequestParam
...ve the @RequestParam annotation, Spring will cleanly bind your request parameters to your class instance:
public @ResponseBody List<MyObject> myAction(
@RequestParam(value = "page", required = false) int page,
MyObject myObject)
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Browse and display files in a git repo without cloning
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The command you want is git ls-remote which allows you to get some information about remote repositories, but you cant show history or list directories or anything of that level: essentially it only lets you see the remote objects at a very high-level (you can see the current HEADs and ta...
How do I create my own URL protocol? (e.g. so://…) [closed]
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The portion with the HTTP://,FTP://, etc are called URI Schemes
You can register your own through the registry.
HKEY_CLASSES_ROOT/
your-protocol-name/
(Default) "URL:your-protocol-name Protocol"
URL Protocol ""
shell/
open/
command/
(Default...
Delaying a jquery script until everything else has loaded
...ipt which I need to run only once everything else on the page, including some other javascripts (over which I have no control) have finished doing their thing.
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