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What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
... properly).
Use the second option if you need to ensure data consistency, and each thread needs to have an up-to-date view of the map. Use the first if performance is critical, and each thread only inserts data to the map, with reads happening less frequently.
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Most lightweight way to create a random string and a random hexadecimal number
What is the most lightweight way to create a random string of 30 characters like the following?
13 Answers
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HTTP POST with URL query parameters — good idea or not? [closed]
I'm designing an API to go over HTTP and I am wondering if using the HTTP POST command, but with URL query parameters only and no request body, is a good way to go.
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Importing from builtin library when module with same name exists
...pec.loader.exec_module(module)
So, you can load any .py file from a path and set the module name to be whatever you want. So just adjust the module_name to be whatever custom name you'd like the module to have upon importing.
To load a package instead of a single file, file_path should be the pat...
Booleans, conditional operators and autoboxing
...time:
E1: `true ? returnsNull() : false` - boolean (auto-unboxing 2nd operand to boolean)
E2: `true ? null : false` - Boolean (autoboxing of 3rd operand to Boolean)
See Java Language Specification, section 15.25 Conditional Operator ? :
For E1, the types of the 2nd and 3rd operands are Boolean...
A Regex that will never be matched by anything
...a stupid question, but I had a long talk with some of my fellow developers and it sounded like a fun thing to think of.
26 ...
Android SQLite DB When to Close
I am working with a SQLite database on android. My database manager is a singleton and right now opens a connection to the database when it is initialized. It is safe to leave the database open the entire time so that when someone calls my class to work with the database it is already open? Or shoul...
How can I get the latest JRE / JDK as a zip file rather than EXE or MSI installer? [closed]
... that everything will work just by copying the contents of the Java folder and setting the environment variables.
30 Answer...
Listing each branch and its last revision's date in Git
I need to delete old and unmaintained branches from our remote repository. I'm trying to find a way with which to list the remote branches by their last modified date, and I can't.
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So, JSONP or CORS? [closed]
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This is a pretty broad question, and could warrant a wiki unto itself. There is also quite a bit on google regarding the two, but I think I can hit a few key points.
If you need a read-only ajax interface to your servers and you need to support IE<=9...