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What is a WeakHashMap and when to use it? [duplicate]
What is a WeakHashMap and when should one be using it? What are the differences between a WeakHashMap and a HashMap ?
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How to check if a symlink exists
I'm trying to check if a symlink exists in bash. Here's what I've tried.
8 Answers
8
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What does f+++++++++ mean in rsync logs?
...better understand the cryptic result lines:
1 - A huge advantage of rsync is that after an interruption the next time it continues smoothly.
The next rsync invocation will not transfer the files again, that it had already transferred, if they were not changed in the meantime. But it will start che...
What is Ad Hoc Query?
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Ad hoc is latin for "for this purpose". You might call it an "on the fly" query, or a "just so" query. It's the kind of SQL query you just loosely type out where you need it
var newSqlQuery = "SELECT * FROM table WHERE id = " + myI...
MySQL select where column is not empty
In MySQL, can I select columns only where something exists?
13 Answers
13
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Maximum packet size for a TCP connection
What is the maximum packet size for a TCP connection or how can I get the maximum packet size?
10 Answers
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What Makes a Method Thread-safe? What are the rules?
...here are probably a million one-off situations, but what about in general? Is it this simple?
4 Answers
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Programmer Puzzle: Encoding a chess board state throughout a game
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Update: I liked this topic so much I wrote Programming Puzzles, Chess Positions and Huffman Coding. If you read through this I've determined that the only way to store a complete game state is by storing a complete list of moves. Read on for w...
What is the difference between Type and Class?
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The following answer is from Gof book (Design Patterns)
An object's class defines how the
object is implemented .The class
defines object's internal state and
the implementation of its
operations.
In contrast, an object's
type ...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it has something to do with having to make a lot of database queries for something that seems simple in the object world.
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