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What is the difference between up-casting and down-casting with respect to class variable
...ing: When we want to cast a Sub class to Super class, we use Upcasting(or widening). It happens automatically, no need to do anything explicitly.
Downcasting : When we want to cast a Super class to Sub class, we use
Downcasting(or narrowing), and Downcasting is not directly possible in Java, expl...
Check if a div exists with jquery [duplicate]
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Unless in code above they got something like $('#DivID') = null; Lol)
– ZurabWeb
Nov 6 '13 at 21:14
9
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Why doesn't logcat show anything in my Android?
Why doesn't logcat show anything in my Android (while developing apps with Eclipse)?
27 Answers
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PHP Remove elements from associative array
...etimes an application architecture doesn't want you to mess with the array id, or makes it inconvenient. For instance, I use CakePHP quite a lot, and a database query returns the primary key as a value in each record, very similar to the above.
Assuming the array is not stupidly large, I would use...
Is the primary key automatically indexed in MySQL?
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I guess this is the answer
mysql> create table test(id int primary key, s varchar(20));
Query OK, 0 rows affected (0.06 sec)
mysql> show indexes from test \G
*************************** 1. row ***************************
Table: test
Non_unique: 0
Key_name: ...
Check if a string has white space
... couldn't you put in s.indexOf(/^\s+$/) as well?
– Zoidberg
Nov 13 '09 at 19:08
2
this is not sup...
chart.js load totally new data
...is is my <canvas> element
$('#graph-container').append('<canvas id="results-graph"><canvas>');
canvas = document.querySelector('#results-graph'); // why use jQuery?
ctx = canvas.getContext('2d');
ctx.canvas.width = $('#graph').width(); // resize to parent width
ctx.canvas...
How can I use a local image as the base image with a dockerfile?
... image called ubuntu different from the official one, your image will override it.
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How do I enable standard copy paste for a TextView in Android?
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Try android:textIsSelectable.
i.e., android:textIsSelectable="true"
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How Pony (ORM) does its tricks?
...ted in the first step, so let me explain how decompiling works.
Let's consider this query:
>>> from pony.orm.examples.estore import *
>>> select(c for c in Customer if c.country == 'USA').show()
Which will be translated into the following SQL:
SELECT "c"."id", "c"."email", "c"...