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How to check if activity is in foreground or in visible background?
...k that the next activity has started because a system dialogue box pops-up and I only want to finish() ; once the user has selected an option from the dialogue box?
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Providing white space in a Swing GUI
...aded Constructor : BorderLayout(int horizontalGap, int verticalGap)
Getter and setter methods
For Horizontal Spacing : BorderLayout.getHgap() and BorderLayout.setHgap(int hgap)
For Vertical Spacing : BorderLayout.getVgap() and BorderLayout.setVgap()
2.) FlowLayout :
Overloaded Constructor : F...
Best implementation for hashCode method for a collection
...ins there why the approach is good.
A short version
Create a int result and assign a non-zero value.
For every field f tested in the equals() method, calculate a hash code c by:
If the field f is a boolean:
calculate (f ? 0 : 1);
If the field f is a byte, char, short or int: calculate (int)f;
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Google Maps v2 - set both my location and zoom in
...s, does anyone know how to set google maps up, to open up both my location and in a zoomed-in view?
11 Answers
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What is a Context Free Grammar?
...to me what a context free grammar is? After looking at the Wikipedia entry and then the Wikipedia entry on formal grammar, I am left utterly and totally befuddled. Would someone be so kind as to explain what these things are?
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What is an index in SQL?
What is an index in SQL? Can you explain or reference to understand clearly?
11 Answers
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List directory tree structure in python?
...
Similar to answers above, but for python3, arguably readable and arguably extensible:
from pathlib import Path
class DisplayablePath(object):
display_filename_prefix_middle = '├──'
display_filename_prefix_last = '└──'
display_parent_prefix_middle = ' '
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What does “./” (dot slash) refer to in terms of an HTML file path location?
... How does this answer the question? Apparently, Simon Suh understands that ./ refers to the same location where the referring file is. The main part of the question then is: "Why to use it and is it necessary at all?". The only reason to prefer the syntax of "./file" instead of "file" I wa...
How to convert JSON data into a Python object
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UPDATE
With Python3, you can do it in one line, using SimpleNamespace and object_hook:
import json
from types import SimpleNamespace
data = '{"name": "John Smith", "hometown": {"name": "New York", "id": 123}}'
# Parse JSON into an object with attributes corresponding to dict keys.
x = json.lo...
How do I rename all files to lowercase?
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If you're comfortable with the terminal:
Open Terminal.app, type cd and then drag and drop the Folder containing the files to be renamed into the window.
To confirm you're in the correct directory, type ls and hit enter.
Paste this code and hit enter:
for f in *; do mv "$f" "$f.tmp"; mv "$f....