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What are the differences between NP, NP-Complete and NP-Hard?
... the technical definitions require quite some time to understand. First of all, let's remember a preliminary needed concept to understand those definitions.
Decision problem: A problem with a yes or no answer.
Now, let us define those complexity classes.
P
P is a complexity class that repres...
What is the difference between buffer and cache memory in Linux?
...p understand:
Buffer is for storing file metadata (permissions, location, etc). Every memory page is kept track of here.
Cache is for storing actual file contents.
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How to get the current date/time in Java [duplicate]
...te / time in a form that allows you to access the components (year, month, etc) numerically, you could use one of the following:
new Date() gives you a Date object initialized with the current date / time. The problem is that the Date API methods are mostly flawed ... and deprecated.
Calendar.get...
Calling parent class __init__ with multiple inheritance, what's the right way?
...ing super() leads to greater flexibility for subclasses.
In the direct call approach, C.__init__ can call both A.__init__ and B.__init__.
When using super(), the classes need to be designed for cooperative multiple inheritance where C calls super, which invokes A's code which will also call supe...
How to make --no-ri --no-rdoc the default for gem install?
... Anyway to make this a system wide default without editing /etc/skel and every user's home directory?
– Hackeron
Jan 13 '11 at 3:43
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Is there a macro recorder for Eclipse? [closed]
...it's not tied to any one program, it can be used in other editors, emails, etc.
For example, if I type ";;ln" AutoHotkey instantly sends the keystrokes to delete this and replace it with "System.out.println();" with the cursor in between the parentheses.
...
File system that uses tags rather than folders?
...imic directory structure. For example in a tag based file system the path /etc/init.d will give all the files that are tagged with exactly two tags i.e 'etc' and 'init.d'. For files which are tagged with other tags as well as these two tags, their extra tags can appear as directories inside /etc/ini...
Hibernate: hbm2ddl.auto=update in production?
...ployments, namely the ones he is familiar with (his company, his industry, etc).
The universe of "production deployments" is vast and varied.
An experienced Hibernate developer knows exactly what DDL is going to result from a given mapping configuration. As long as you test and validate that what...
What is the difference between GitHub and gist?
...lly in need of any supporting files, no one is ever going to make tickets, etc (as an aside that config is probably old so don't use it)). example of a project it's pretty small but someone could open a ticket with suggestions and easy to remember address vs gist's url
– vrill...
Software Design vs. Software Architecture [closed]
...gn patterns, there are architectural patterns: MVC, 3-tier layered design, etc.
Software design is about designing the individual modules / components. What are the responsibilities, functions, of module x? Of class Y? What can it do, and what not? What design patterns can be used?
So in short, S...