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When do you need to explicitly call a superclass constructor?
...u don't specify anything else. You only need to specify the constructor to call if:
You want to call a superclass constructor which has parameters
You want to chain to another constructor in the same class instead of the superclass constructor
You claim that:
At the same time I've also seen ...
What does JVM flag CMSClassUnloadingEnabled actually do?
...t the bottom of groovy.codehaus.org/Running: "Groovy creates classes dynamically, but the default Java VM does not GC the PermGen. If you are using Java 6 or later, add -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC. UseConcMarkSweepGC is needed to enable CMSClassUnloadingEnabled."
...
ASP.NET MVC partial views: input name prefixes
...the child class (which must be stored in a subfolder of the view directory called EditorTemplates):
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MvcLearner.Models.TwoPart>" %>
<%= Html.LabelFor(birthday => birthday.Day) %><br />
<%= Html.EditorFo...
Why is good UI design so hard for some Developers? [closed]
...framing how you think about software.
Most hardcore developers have practically zero empathy with users of their software. They have no clue how users think, how users build models of software they use and how they use a computer in general.
It is a typical problem when an expert collides with a l...
Comparing date ranges
...-| equal start with end of comparison period
If your table has columns called range_end and range_start, here's some simple SQL to retrieve all the matching rows:
SELECT *
FROM periods
WHERE NOT (range_start > @check_period_end
OR range_end < @check_period_start)
Note the N...
using facebook sdk in Android studio
...es:facebook”.
Click OK on
all the dialogs.
Android Studio will automatically resynchronize your project (making it unnecessary to click that "Sync Project with Gradle Files" button again) and
pick up the new dependency. You should be good to go.
...
Finding the type of an object in C++
...bject of type A as a parameter, so I have to accept an A. However, I later call functions that only B has, so I want to return false and not proceed if the object passed is not of type B.
...
Android AsyncTask testing with Android Test Framework
... some service which worked with Executors, and I needed to have my service callbacks sync-ed with the test methods from my ApplicationTestCase classes. Usually the test method itself finished before the callback would be accessed, so the data sent via the callbacks would not be tested. Tried applyin...
sqlalchemy: how to join several tables by one query?
...ording the relations, and the yield 3-tuples. The arguments to the query() call are essentially the select list in sqlalchemy.
– letitbee
Jan 17 '14 at 18:53
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Difference between java.util.Random and java.security.SecureRandom
...
The standard Oracle JDK 7 implementation uses what's called a Linear Congruential Generator to produce random values in java.util.Random.
Taken from java.util.Random source code (JDK 7u2), from a comment on the method protected int next(int bits), which is the one that gener...