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Inheritance vs. Aggregation [closed]
...ginal class in a root class and a sub class. And let the new class inherit from the root class. But you should take care with this, not to create an illogical separation.
Lets add an example. We have a class 'Dog' with methods: 'Eat', 'Walk', 'Bark', 'Play'.
class Dog
Eat;
Walk;
Bark;
Pla...
What is null in Java?
...languages). Note also that by contract, it also has this special property (from java.lang.Object):
public boolean equals(Object obj)
For any non-null reference value x, x.equals(null) should return false.
It is also the default value (for variables that have them) for all reference types...
Rename a file using Java
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Copied from http://exampledepot.8waytrips.com/egs/java.io/RenameFile.html
// File (or directory) with old name
File file = new File("oldname");
// File (or directory) with new name
File file2 = new File("newname");
if (file2.exis...
ViewPager and fragments — what's the right way to store fragment's state?
...r.instantiateItem(View, int) and save a reference to the fragment returned from the super call before returning it (it has the logic to find the fragment, if already present).
For a fuller picture, have a look at some of the source of FragmentPagerAdapter (short) and ViewPager (long).
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Editing screenshots in iTunes Connect after iOS app was approved
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Acutally new version of Developer Guide has an update from Sept 2010: Screenshots are now an unlocked metadata attribute and can be updated at any time
– Fraggle
Jan 20 '11 at 14:49
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What exactly is a C pointer if not a memory address?
...their addresses in pointers to them. Instead you can number your variables from 1 to whatever and store that number in the pointer. That is perfectly legal per the language standard so long as the implementation knows how to transform those numbers into addresses and how to do pointer arithmetic wit...
What is NODE_ENV and how to use it in Express?
...y set NODE_ENV for your environment, it will be undefined if you access it from process.env, there is no default.
Setting NODE_ENV
How to actually set the environment variable varies from operating system to operating system, and also depends on your user setup.
If you want to set the environment va...
Github Windows 'Failed to sync this branch'
... of some conflicting changes. I removed the local repository of my project from my desktop and then cloned it again from the github website (using clone option in my account), the error was gone.
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What is the difference between an expression and a statement in Python?
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Expression -- from the New Oxford American Dictionary:
expression: Mathematics a collection
of symbols that jointly express a
quantity : the expression for the
circumference of a circle is 2πr.
In gross general terms: Express...
Using SASS with ASP.NET [closed]
I'm looking into ways to use SASS (Syntactically Awesome StyleSheets) from the Ruby HAML package in an ASP.NET environment. Ideally, I would like compilation of SASS files into CSS to be a seamless part of the build process.
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