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Scala: write string to file in one statement
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A concise one line:
import java.io.PrintWriter
new PrintWriter("filename") { write("file contents"); close }
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Lock, mutex, semaphore… what's the difference?
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A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.
A mutex is the same as a lock but it can be system wide (shared by multiple processes).
A semaphore does the same as a mutex bu...
Adding one day to a date
My code to add one day to a date returns a date before day adding:
2009-09-30 20:24:00 date after adding one day SHOULD be rolled over to the next month: 1970-01-01 17:33:29
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How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
...tination port" header field.
Now, there are two answers to your question, one for stateful protocols and one for stateless protocols.
For a stateless protocol (ie UDP), there is no problem because "connections" don't exist - multiple people can send packets to the same port, and their packets will...
Putting an if-elif-else statement on one line?
...itional operator? (the question is about condensing if-else statement to one line)
11 Answers
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Concatenate multiple result rows of one column into one, group by another column [duplicate]
I'm having a table like this
2 Answers
2
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Add new column with foreign key constraint in one command
...rations separated by commas. For example...
Informix syntax:
ALTER TABLE one
ADD two_id INTEGER,
ADD CONSTRAINT FOREIGN KEY(two_id) REFERENCES two(id);
The syntax for IBM DB2 LUW is similar, repeating the keyword ADD but (if I read the diagram correctly) not requiring a comma to separate...
How does the HyperLogLog algorithm work?
...ve been learning about different algorithms in my spare time recently, and one that I came across which appears to be very interesting is called the HyperLogLog algorithm - which estimates how many unique items are in a list.
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How to check that an object is empty in PHP?
...ray) $obj) does not work in PHP 5.4+ has nothing to do with typecasting on one line. You get the error because empty() takes a reference to the variables passed to it, and it cannot get a reference when typecasting unless you first store that typecasted variable in another variable. It does this bec...
Why does one use dependency injection?
...posable, IEnumerable or IPrintable. A class is an actual implementation of one or more of these interfaces: List or Map may both be implementations of IEnumerable.
To get the point: Often your classes depend on each other. E.g. you could have a Database class which accesses your database (hah, surp...