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Covariance, Invariance and Contravariance explained in plain English?
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Some say it is about relationship between types and subtypes, other say it is about type conversion and others say it is used to decide whether a method is overwritten or overloaded.
All of the above.
At heart, these terms describe...
Add floating point value to android resources/values
I'm trying to add a little space between lines to my TextViews using android:lineSpacingMultiplier
from the documentation :
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Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
...stall PostgreSQL 9.0.4. I've looked at the last question and the link that it referenced, but I did not find a file called "uninstall-postgresql" when I run this command:
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gulp.run is deprecated. How do I compose tasks?
Here is a composed task I don't know how to replace it with task dependencies.
10 Answers
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Differences in string compare methods in C#
...aring string in C# is pretty simple. In fact there are several ways to do it. I have listed some in the block below. What I am curious about are the differences between them and when one should be used over the others? Should one be avoided at all costs? Are there more I haven't listed?
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How to create a custom attribute in C#
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While the code to create a custom Attribute is fairly simple, it's very important that you understand what attributes are:
Attributes are metadata compiled into your program. Attributes themselves do not add any functionality to a class, property or module - just data. However, using r...
What is token-based authentication?
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I think it's well explained here -- quoting just the key sentences of the long article:
The general concept behind a
token-based authentication system is
simple. Allow users to enter their
username and password in order to
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Convert character to ASCII numeric value in java
...you need to get the specific Character from the String first and then cast it.
char character = name.charAt(0); // This gives the character 'a'
int ascii = (int) character; // ascii is now 97.
Though cast is not required explicitly, but its improves readability.
int ascii = character; // Even t...
How can I get the executing assembly version?
... an assembly reference is not always an option. As such, I personally find it useful to create a static helper class in projects where I may need to reference the underlying assembly or assembly version:
// A sample assembly reference class that would exist in the `Core` project.
public static clas...
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
...有过关于这个问题的解释，比如人民网上这位“并没有twitter方面做过交流”的专家，或者这位新浪微博的副主编（原来新浪微博是有编辑的啊），还有各种论坛、百度知道提问等等，都不足以让人信服，考据癖没能得到满足，...