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How do I efficiently iterate over each entry in a Java Map?
...p.entrySet()) {
i += pair.getKey() + pair.getValue();
}
Using forEach from Java 8
final long[] i = {0};
map.forEach((k, v) -> i[0] += k + v);
Using keySet and foreach
long i = 0;
for (Integer key : map.keySet()) {
i += key + map.get(key);
}
Using keySet and iterator
long i = 0;
Iter...
Devise form within a different controller
...re specified by Devise and so aren't present when you access a Devise form from a non-Devise controller.
To get around this, you need to add the following methods to the helper class of the controller you wish to display the form under. Alternatively, you can just add them to your application helpe...
What is the difference between C++ and Visual C++? [duplicate]
...sktop apps that were written in Visual C++, so that is perfectly feasible. From what I know of Visual Basic, the main advantage seems to be that the first part of the development cycle may be done faster than when using Visual C++, but as the complexity of a project increases, C++ programs tend to b...
Android phone orientation overview including compass
...stem changes when you rotate the device. Thus, when the device is rotated from its default view mode, the sensor coordinate system is no longer the same as the screen coordinate system. The rotation matrix in this case is used to transform A to C (B always remains fixed).
Here's a code snippet to...
Django URL Redirect
...
You can try the Class Based View called RedirectView
from django.views.generic.base import RedirectView
urlpatterns = patterns('',
url(r'^$', 'macmonster.views.home'),
#url(r'^macmon_home$', 'macmonster.views.home'),
url(r'^macmon_output/$', 'macmonster.views.outpu...
How to read and write excel file
I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
...
Why use a public method in an internal class?
...ion of a member and immediately know whether it is going to be called only from internal code.
Unfortunately, that doesn't always work out nicely; for example, an internal class that implements an internal interface still has to have the implementing members marked as public, because they are part...
JSF vs Facelets vs JSP [duplicate]
...n an MVC pattern
JSPs are a (much older) standard for generating web pages from templates - these can be used as the View in a JSF application, but also separately from JSF.
Facelets are an alternative view technology based on pure XML templates (no scriptlets) which was introduced with Version 2 of...
Upgrade python in a virtualenv
...nd it worked fine for me. I think you may have some problems if you change from python 2.6 to 2.7 or 2.7 to 3.x but if you just upgrade inside the same version (staying at 2.7 as you want) you shouldn't have any problem, as all the packages are held in the same folders for both python versions (2.7....
Get full path without filename from path that includes filename
...re passing to it does contain a file name; it simply removes the final bit from the path, whether it is a file name or directory name (it actually has no idea which).
You could validate first by testing File.Exists() and/or Directory.Exists() on your path first to see if you need to call Path.GetDi...