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When to use StringBuilder in Java [duplicate]

It is supposed to be generally preferable to use a StringBuilder for string concatenation in Java. Is this always the case? ...
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What does the CSS rule “clear: both” do?

..., and will explain to you graphically why clear: both; is required or what it does... Generally designers float the elements, left or to the right, which creates an empty space on the other side which allows other elements to take up the remaining space. Why do they float elements? Elements are f...
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text flowing out of div

When the text is without spaces and more than the div size 200px it's flowing out The width is defined as 200px I have put my code here http://jsfiddle.net/madhu131313/UJ6zG/ You can see the below pictures edited : I want the the text to go to the next line ...
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Difference between java.lang.RuntimeException and java.lang.Exception

...heck the index first. RuntimeException are not checked by the compiler, so it is clean code. EDIT : These days people favor RuntimeException because the clean code it produces. It is totally a personal choice. share ...
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Is there a “null coalescing” operator in JavaScript?

... Update JavaScript now supports the nullish coalescing operator (??). It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns its left-hand-side operand. Please check compatibility before using it. The JavaScript equivalent of the ...
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How to do the equivalent of pass by reference for primitives in Java

... return toyNumber } This choice would require a small change to the callsite in main so that it reads, toyNumber = temp.play(toyNumber);. Choice 3: make it a class or static variable If the two functions are methods on the same class or class instance, you could convert toyNumber into a class me...
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Parsing huge logfiles in Node.js - read in line-by-line

... line using a stream. All the third-party libraries and examples did not suit my needs since they processed the files not line by line (like 1 , 2 , 3 , 4 ..) or read the entire file to memory The following solution can parse very large files, line by line using stream & pipe. For testing I use...
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What is the difference between task and thread?

...id some sample program(help taken from MSDN) for my own sake of learning with 8 Answers ...
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What is the purpose of the single underscore “_” variable in Python?

...y the standard CPython interpreter, and other interpreters have followed suit As a general purpose "throwaway" variable name to indicate that part of a function result is being deliberately ignored (Conceptually, it is being discarded.), as in code like: label, has_label, _ = text.partition(':'). As...
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Ways to circumvent the same-origin policy

I wanted to make a community wiki regarding HTML/JS same-origin policies to hopefully help anyone searching for this topic. This is one of the most searched-for topics on SO and there is no consolidated wiki for it so here I go :) ...