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Difference between single and double square brackets in Bash
...nt of [ that prevents further arguments from being used.
Ubuntu 16.04 actually has an executable for it at /usr/bin/[ provided by coreutils, but the bash built-in version takes precedence.
Nothing is altered in the way that Bash parses the command.
In particular, < is redirection, && a...
Use of Initializers vs Constructors in Java
...hen the class is loaded, then a static initializer is the way to go, especially as it allows you to do a complex initialization and still have the static variable be final. This is a big win.
I find "if (someStaticVar == null) // do stuff" to be messy and error prone. If it is initialized statica...
Get nested JSON object with GSON using retrofit
I'm consuming an API from my android app, and all the JSON responses are like this:
12 Answers
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Python: Continuing to next iteration in outer loop
...thing:
return
inner()
Use exceptions
Philosophically, this is what exceptions are for, breaking the program flow through the structured programming building blocks (if, for, while) when necessary.
The advantage is that you don't have to break the single piece of code into...
What is the cleanest way to get the progress of JQuery ajax request?
In plain javascript is very simple: need just to attach the callback to {XMLHTTPRequest}.onprogress
6 Answers
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How to force garbage collector to run?
...ing it more than necessary is inadvisable. The code for when it should be called is well written. You should normally only self collect in specialized edge cases. stackoverflow.com/a/21961777/2710988
– Brandon Barkley
Mar 7 '19 at 19:13
...
Android - Start service on boot
...
onStart() callback is deprecated. You should use onStartCommand() instead.
– mmBs
May 18 '16 at 13:52
1
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Why is Multiple Inheritance not allowed in Java or C#?
I know that multiple inheritance is not allowed in Java and C#. Many books just say, multiple inheritance is not allowed. But it can be implemented by using interfaces. Nothing is discussed about why it is not allowed. Can anybody tell me precisely why it is not allowed?
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When to use virtual destructors?
...
Virtual destructors are useful when you might potentially delete an instance of a derived class through a pointer to base class:
class Base
{
// some virtual methods
};
class Derived : public Base
{
~Derived()
{
// Do some important cleanup
}
};
Her...
Android Lint contentDescription warning
...trouble later on. You're better off just specifying contentDescription for all of your ImageViews. If you don't need a description, then just use:
android:contentDescription="@null"
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