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Java: Difference between PrintStream and PrintWriter

What is the difference between PrintStream and PrintWriter ? They have many methods in common due to which I often mix these two classes up. Moreover, I think we can use them for exactly the same things. But there has to be a difference, otherwise, there would have been only one class. ...
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Algorithm to detect corners of paper sheet in photo

... working on this earlier this year. This was my first ever coding project, and kinda ended in a bit of a rush, so the code needs some errr...decoding... I'll give a few tips from what I've seen you doing already, and then sort my code on my day off tomorrow. First tip, OpenCV and python are awesom...
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Difference between StringBuilder and StringBuffer

What is the main difference between StringBuffer and StringBuilder ? Is there any performance issues when deciding on any one of these? ...
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Using Caps Lock as Esc in Mac OS X

...he System Preferences, choose Keyboard, then the Keyboard Tab (first tab), and click Modifier Keys: In the popup dialog set Caps Lock Key to No Action: 2) Now, click here to download Seil and install it: 3) After the installation you will have a new Application installed ( Mountain Lion an...
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Difference between framework and static library in xcode4, and how to call them

I am quite new to xcode and objective-c. I want to ask a very basic question. 2 Answers ...
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Generate a random point within a circle (uniformly)

I need to generate a uniformly random point within a circle of radius R . 21 Answers ...
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What is the purpose of “&&” in a shell command?

As far as I know, using & after the command is for running it in the background. 9 Answers ...
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What is the difference between Serializable and Externalizable in Java?

What is the difference between Serializable and Externalizable in Java? 11 Answers ...
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Extending from two classes

... You can only Extend a single class. And implement Interfaces from many sources. Extending multiple classes is not available. The only solution I can think of is not inheriting either class but instead having an internal variable of each class and doing more o...
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Postgres and Indexes on Foreign Keys and Primary Keys

Does Postgres automatically put indexes on Foreign Keys and Primary Keys? How can I tell? Is there a command that will return all indexes on a table? ...