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What does “program to interfaces, not implementations” mean?
One stumbles upon this phrase when reading about design patterns.
7 Answers
7
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How to convert a string to an integer in JavaScript?
...px", but it's also somewhat dangerous, since it won't give you any kind of error on bad input, instead you'll get back NaN unless the string starts with a number. Whitespace at the beginning of the string is ignored. Here's an example of it doing something different to what you want, and giving no ...
Why doesn't Java support unsigned ints?
...);
b = (char) (b % 3);
b = (char) (b / a);
//a = -1; // Generates complier error, must be cast to char
System.out.println(a); // Prints ?
System.out.println((int) a); // Prints 65532
System.out.println((short) a); // Prints -4
short c = -4;
System.out.println((int) c); // Prints -4, notice the diff...
Avoid web.config inheritance in child web application using inheritInChildApplications
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I get this error "The configuration section 'configSections' cannot be read because it is missing a section declaration " in my parents web.config file.
– Blankman
Apr 23 '09 at 15:37
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Convert RGBA PNG to RGB with PIL
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This code was causing a error for me: tuple index out of range. I fixed this by following another question(stackoverflow.com/questions/1962795/…). I had to convert the PNG to RGBA first and then slice it: alpha = img.split()[-1] then use that on t...
What is the easiest way to parse an INI file in Java?
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doesn't work, error says "IniFile cannot be resolved to a type"
– Caballero
May 3 '13 at 15:16
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Mercurial move changes to a new branch
I have a number of changes that I committed to my local repository, but have not yet been pushed. Since on a feature is taking longer than expected, I want to swap these changes onto a named branch before I push. How can I do this?
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How to style icon color, size, and shadow of Font Awesome Icons
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Looks like the FontAwesome icon color responds to text-info, text-error, etc.
<div style="font-size: 44px;">
<i class="icon-umbrella icon-large text-error"></i>
</div>
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How can I read a large text file line by line using Java?
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Here is a sample with full error handling and supporting charset specification for pre-Java 7. With Java 7 you can use try-with-resources syntax, which makes the code cleaner.
If you just want the default charset you can skip the InputStream and use ...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...ch other; one of them successfully INSERTs; the other gets a duplicate key error and does an UPDATE instead. The UPDATE blocks waiting for the INSERT to rollback or commit. When it rolls back, the UPDATE condition re-check matches zero rows, so even though the UPDATE commits it hasn't actually done ...