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What is mutex and semaphore in Java ? What is the main difference?
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Semaphore can be counted, while mutex can only count to 1.
Suppose you have a thread running which accepts client connections. This thread can handle 10 clients simultaneously. Then each new client sets the semaphore until it reaches 10. ...
How do I reverse an int array in Java?
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When to use DataContract and DataMember attributes?
I am very confused about the DataContract attribute in WCF. As per my knowledge it is used for serializating user defined type like classes. I wrote one class which is exposed at client side like this.
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Using a .php file to generate a MySQL dump
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You can use the exec() function to execute an external command.
Note: between shell_exec() and exec(), I would choose the second one, which doesn't return the output to the PHP script -- no need for the PHP script to get the whole SQL dump as a string : you only need it written to a file, and t...
无社交不商业，Uber将边缘化BAT - 资讯 - 清泛网 - 专注C/C++及内核技术
无社交不商业，Uber将边缘化BAT有人说，互联网+传统行业，如果深入去挖掘，我们就发现，互联网的核心是社群思维，传统行业的核心是产品。互联网+，就是社群+产品，产品型
有人说，互联网+传统行业，如果深入...
Read lines from a file into a Bash array [duplicate]
I am trying to read a file containing lines into a Bash array.
6 Answers
6
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What is the perfect counterpart in Python for “while not EOF”
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Loop over the file to read lines:
with open('somefile') as openfileobject:
for line in openfileobject:
do_something()
File objects are iterable and yield lines until EOF. Using the file object as an iterable uses a buffer to ensure performant reads.
You can do the same with th...
Format date in a specific timezone
I'm using Moment.js to parse and format dates in my web app. As part of a JSON object, my backend server sends dates as a number of milliseconds from the UTC epoch (Unix offset).
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cleanest way to skip a foreach if array is empty [duplicate]
Not a major problem but I was wondering if there is a cleaner way to do this. It would be good to avoid nesting my code with an unnecessary if statement. If $items is empty php throws an error.
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Testing web application on Mac/Safari when I don't own a Mac
Having been caught out recently when a web site I launched displayed perfectly on IE, Firefox, Chrome and Safari on Windows but was corrupted when viewed using Safari on the Mac (by a potential customer), I need to start testing how my sites look when viewed on a Mac.
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