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How do I calculate someone's age in Java?
I want to return an age in years as an int in a Java method.
What I have now is the following where getBirthDate() returns a Date object (with the birth date ;-)):
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Modulo operation with negative numbers
...mple A. 5/(-3) is -1
=> (-1) * (-3) + 5%(-3) = 5
This can only happen if 5%(-3) is 2.
Example B. (-5)/3 is -1
=> (-1) * 3 + (-5)%3 = -5
This can only happen if (-5)%3 is -2
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How to remove files that are listed in the .gitignore but still on the repository?
...rom the repository manually:
git rm --cached file1 file2 dir/file3
Or, if you have a lot of files:
git rm --cached `git ls-files -i --exclude-from=.gitignore`
But this doesn't seem to work in Git Bash on Windows. It produces an error message. The following works better:
git ls-files -i --ex...
Pickle incompatibility of numpy arrays between Python 2 and 3
...ject, which is assumed to be ASCII, while in this case it is binary data. If this is a bug in the Python 3 unpickler, or a "misuse" of the pickler by numpy, I don't know.
Here is something of a workaround, but I don't know how meaningful the data is at this point:
import pickle
import gzip
import...
submitting a GET form with query string params and hidden params disappear
... browser retaining any existing query string in the action URL.
As the specifications (RFC1866, page 46; HTML 4.x section 17.13.3) state:
If the method is "get" and the action is an HTTP URI, the user agent takes the value of action, appends a `?' to it, then appends the form data set, encoded usin...
普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...；data表示实际执行的结果。所以每次调用都要执行一个if判断，如果错误代码不存在还需要自己新增一个。虽然我的项目经理告诉我这个方法就是“标准”，但是我觉得这个写法太low了。所以等到我能自己决定怎么写的时候，我...
How to automatically reload a page after a given period of inactivity
How can I automatically reload a webpage, if there have been no activity on the page for a given period of time?
14 Answers...
What is the use of making constructor private in a class?
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@Will: Not if you use reflection. Declaring constructors private is intended to prevent instantiation (barring reflection), but preventing subclassing is a side effect, not the intent. The appropriate tool for this is declaring the cla...
Should I store entire objects, or pointers to objects in containers?
...
Since people are chiming in on the efficency of using pointers.
If you're considering using a std::vector and if updates are few and you often iterate over your collection and it's a non polymorphic type storing object "copies" will be more efficent since you'll get better locality of ref...
How to merge a transparent png image with another image using PIL
...third parameter. It indicates a mask that will be used to paste the image. If you pass a image with transparency, then the alpha channel is used as mask.
Check the docs.
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