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What is the difference between up-casting and down-casting with respect to class variable
...ther, and i believe that's what causes a lot of confusion, when programmer starts to learn casting objects.
Polymorphism: All methods in java are virtual by default. That means that any method can be overridden when used in inheritance, unless that method is declared as final or static.
You can see ...
Does Java SE 8 have Pairs or Tuples?
...s remarkably insightful and has no flamage. It's quite convincing. When it started I thought, "Yeah, there should be a Pair class in Java SE" but by the time the thread reached its end I had changed my mind.
Note however that JavaFX has the javafx.util.Pair class. JavaFX's APIs evolved separately f...
Why is there no SortedList in Java?
...ever, if you want to do it as an exercise here is a code sample to get you started, it uses the AbstractList abstract class:
public class SortedList<E> extends AbstractList<E> {
private ArrayList<E> internalList = new ArrayList<E>();
// Note that add(E e) in Abstr...
CSS z-index paradox flower
...tom right sides of the circle's border.
Demo
CSS (that is different from starting point)
.i1 {
position: absolute; top: 30px; left: 0px;
&:before {
content: '';
position: absolute;
z-index: 100;
top: 0;
left: 0;
width: 50px;
height: 50px;
border-radius: 5...
Best way to compare two complex objects
... }
}
Update: This answer was written several years ago. Since then, I've started to lean away from implementing IEquality<T> for mutable types for such scenarios. There are two notions of equality: identity and equivalence. At a memory representation level, these are popularly distinguished ...
Unit Testing C Code [closed]
...
This is pretty close to what I came up with before I started searching here! I would like to automate the testing so that TEST(funcname, body) creates the function and stores a pointer to the function, but it looks like I'll need to to some external processing.
...
TCP: can two different sockets share a port?
...stat -atnp | grep -i ":500 "
As expected, the output is blank. Now let's start a web server:
sudo python3 -m http.server 500
Now, here is the output of running netstat again:
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:500...
How does collections.defaultdict work?
...clusion, whenever you need a dictionary, and each element’s value should start with a default value, use a defaultdict.
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Undo a merge by pull request?
...
Starting June 24th, 2014, you can try cancel a PR easily (See "Reverting a pull request") with:
Introducing the Revert Button
you can easily revert a pull request on GitHub by clicking Revert:
You'll be prompted t...
Storyboard - refer to ViewController in AppDelegate
...stantiated it again and assigned it again. Your app is off to a pretty bad start!
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