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How to make an array of arrays in Java
...lements and there are specialized Collections for different functionality (index-based lookup, sorting, uniqueness, FIFO-access, concurrency etc.).
While it's of course good and important to know about Arrays and their usage, in most cases using Collections makes APIs a lot more manageable (which i...
What exactly are iterator, iterable, and iteration?
...n iterator, or which defines a __getitem__ method that can take sequential indexes starting from zero (and raises an IndexError when the indexes are no longer valid). So an iterable is an object that you can get an iterator from.
An iterator is an object with a next (Python 2) or __next__ (Python 3...
How to get a string after a specific substring?
...
s1 = "hello python world , i'm a beginner "
s2 = "world"
print s1[s1.index(s2) + len(s2):]
If you want to deal with the case where s2 is not present in s1, then use s1.find(s2) as opposed to index. If the return value of that call is -1, then s2 is not in s1.
...
Is there a goto statement in Java?
...e) or by extracting a piece of code into a method.
Source: James Gosling, Q&A session
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MenuItemCompat.getActionView always returns null
...o app:actionViewClass
Implementing android.support.v7.widget.SearchView.OnQueryTextListener interface for current activity.
Directly use setOnQueryTextListener instead of SearchViewCompat.setOnQueryTextListener
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = get...
how to show lines in common (reverse diff)?
...
On *nix, you can use comm. The answer to the question is:
comm -1 -2 file1.sorted file2.sorted
# where file1 and file2 are sorted and piped into *.sorted
Here's the full usage of comm:
comm [-1] [-2] [-3 ] file1 file2
-1 Suppress the output column of lines unique t...
“var” or no “var” in JavaScript's “for-in” loop?
...ave more than one for-loop in one scope? You will either have to reuse the index (no var), or you will have to declare lots and lots of new variables (j, k, l, m, …) which you will never use again.
– armin
Sep 2 '15 at 5:14
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How do I use Ruby for shell scripting?
...the name of the current file
Also useful from the stdlib is FileUtils
require 'fileutils' #I know, no underscore is not ruby-like
include FileUtils
# Gives you access (without prepending by 'FileUtils.') to
cd(dir, options)
cd(dir, options) {|dir| .... }
pwd()
mkdir(dir, options)
mkdir(list, opti...
psql: FATAL: database “” does not exist
I'm using the PostgreSql app for mac ( http://postgresapp.com/ ). I've used it in the past on other machines but it's giving me some trouble when installing on my macbook. I've installed the application and I ran:
...
How to loop backwards in python? [duplicate]
...-1) instead of range(10, 0, -1). because range(10, 0, -1) will stop at the index 0, as a result, the index 0 value will not print.
– Hatim
Nov 30 '15 at 15:03
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