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Difference between & and && in Java? [duplicate]

I was just wondering what the difference between & and && is? A few days I wrote a condition for an if statement the looked something like: ...
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Java FileOutputStream Create File if not exists

Is there a way to use FileOutputStream in a way that if a file (String filename) does not exist, then it will create it? 9 ...
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Iterate through pairs of items in a Python list [duplicate]

Is it possible to iterate a list in the following way in Python (treat this code as pseudocode)? 5 Answers ...
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Extracting hours from a DateTime (SQL Server 2005)

I can extract the month and day by using Day(Date()) , Month(Date()) . I can't extract hours, with HOUR(Date()) . I get the following error. ...
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IntelliJ IDEA shows errors when using Spring's @Autowired annotation

IntelliJ IDEA is showing errors when I use Spring's @Autowired annotation in the class, but the class is functioning without any problem. ...
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How to sort a HashSet?

For lists, we use the Collections.sort(List) method. What if we want to sort a HashSet ? 19 Answers ...
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Color picker utility (color pipette) in Ubuntu [closed]

I'am looking for a color picker utility on Ubuntu/Debian. Anything simple and easy to use. 2 Answers ...
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Java - removing first character of a string

In Java, I have a String: 12 Answers 12 ...
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How to make a SIMPLE C++ Makefile

We are required to use a Makefile to pull everything together for our project, but our professor never showed us how to. 7 ...
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What characters can be used for up/down triangle (arrow without stem) for display in HTML?

I'm looking for a HTML or ASCII character which is a triangle pointing up or down so that I can use it as a toggle switch. ...