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What's the best way to build a string of delimited items in Java?

While working in a Java app, I recently needed to assemble a comma-delimited list of values to pass to another web service without knowing how many elements there would be in advance. The best I could come up with off the top of my head was something like this: ...
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Finding out whether a string is numeric or not

How can we check if a string is made up of numbers only. I am taking out a substring from a string and want to check if it is a numeric substring or not. ...
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How to check if a file contains a specific string using Bash

I want to check if a file contains a specific string or not in bash. I used this script, but it doesn't work: 11 Answers ...
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Comparison of CI Servers? [closed]

I am searching for a comparison of different continuous integration (CI) Servers (esp. focusing on .NET) and couldn't find any. ...
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How can I create an object and add attributes to it?

I want to create a dynamic object (inside another object) in Python and then add attributes to it. 16 Answers ...
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What does “WARN Could not determine content-length of response body.” mean and how to I get rid of i

Since upgrading to Rails 3.1 I'm seeing this warning message in my development log: 9 Answers ...
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Why is a pure virtual function initialized by 0?

We always declare a pure virtual function as: 11 Answers 11 ...
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Why does setTimeout() “break” for large millisecond delay values?

I came across some unexpected behavior when passing a large millisecond value to setTimeout() . For instance, 7 Answers ...
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Quit and restart a clean R session from within R?

Is there a way I can make an alias, within R, that will execute q() and then restart a clean R session? 12 Answers ...
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Why do Python's math.ceil() and math.floor() operations return floats instead of integers?

Can someone explain this (straight from the docs - emphasis mine): 8 Answers 8 ...