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Implementation difference between Aggregation and Composition in Java

... The Engine lives and dies with the car. With aggregation, the Car also performs its functions through an Engine, but the Engine is not always an internal part of the Car. Engines may be swapped, or even completely removed. Not only that, but the outside world can still have a reference to the Engin...
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What does the `#` operator mean in Scala?

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Pry: show me the stack

... True to form for the Ruby community, the only useful answer is buried underneath advice to go install some plugins. – Jesse Dhillon Jan 21 '16 at 20:38 ...
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Why java classes do not inherit annotations from implemented interfaces?

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Why does this code using random strings print “hello world”?

...works and showing how you can construct your own examples, but here's an information theoretical answer showing why we can reasonably expect a solution to exist that the brute force search will eventually find. The 26 different lower-case letters form our alphabet Σ. To allow generating words of di...
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Understanding the map function

...oduct out of map would be impossible, anything map produces is always some form of a list) – Kristopher Micinski Jun 11 '12 at 2:04 ...
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XML attribute vs XML element

...read through some of the answers and something that wasn't stressed enough form my experience is that if you data in an "attribute" and suddenly has a > or < you XML document will break I think there are five ascii chars (>, <, &, ?,") that will kill it. If this special character w...
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Async call with await in HttpClient never returns

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How can I create a UIColor from a hex string?

How can I create a UIColor from a hexadecimal string format, such as #00FF00 ? 47 Answers ...
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How to track untracked content?

... add vendor/plugins/open_flash_chart_2/ # NOTICE THE SLASH!!!! The second form will add it without gitlink, and the contents are trackable. The .git dir is conveniently & automatically ignored. Thank you Chris! share ...