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Are list-comprehensions and functional functions faster than “for loops”?
...on level micro optimization is going to make it fast enough and you should start thinking about dropping to C. While extensive micro optimizations can often speed up Python code considerably, there is a low (in absolute terms) limit to this. Moreover, even before you hit that ceiling, it becomes sim...
How can I reliably determine the type of a variable that is declared using var at design time?
...o -- we do the same thing; we skip as much work as we reasonably can.
We start with a pass which analyzes only the local variable declarations within that method. When we run that pass we make a mapping from a pair of "scope" and "name" to a "type determiner". The "type determiner" is an object t...
Calling startActivity() from outside of an Activity?
...
yes this works. but if you want to start multiple instances of the same Activity this does not work. Since the FLAG_ACTIVITY_NEW_TASK will resume the same existing Activity
– Ovidiu Latcu
Sep 30 '11 at 13:16
...
Providing white space in a Swing GUI
...= 5;
private String[] borderConstraints = {
BorderLayout.PAGE_START,
BorderLayout.LINE_START,
BorderLayout.CENTER,
BorderLayout.LINE_END,
BorderLayout.PAGE_END
};
private JButton[] buttons;
private GridBagConstraints gbc;
private JPanel...
Are static variables shared between threads?
...operation. The synchronized and volatile constructs, as well as the Thread.start() and Thread.join() methods, can form happens-before relationships. In particular:
Each action in a thread happens-before every action in that thread that comes later in the program's order.
An unlock (synchronized bl...
Where is Vagrant saving changes to the VM?
I am just starting with Vagrant and I am having a little trouble understanding a few details. I have read through the docs but still am missing a basic concept. When I want to start a Vagrant box I run:
...
ORA-12514 TNS:listener does not currently know of service requested in connect descriptor
...problem Service Name, then in Windows "Services" control panel, I did a "Restart" on the Oracle listener service. Now all is well.
For example, your listener.ora file might initially look like:
# listener.ora Network Configuration File: C:\app\oracle_user\product\12.1.0\dbhome_1\network\admin\l...
Android Studio: Default project directory
...ngs -> Default settings... -> Terminal --> Project setting --> Start Directory --> ("Browse or Set Your Project Directory Path")
Now Close current Project and Start New Project Then Let Your eyes see Project Location
...
Do zombies exist … in .NET?
...int dwExitCode);
static void Main(string[] args)
{
new Thread(Target).Start();
Console.ReadLine();
}
private static void Target()
{
using (var file = File.Open("test.txt", FileMode.OpenOrCreate))
{
ExitThread(0);
}
}
This program starts a thread Target which opens a f...
How to get 30 days prior to current date?
I have a start calendar input box and an end calendar input box. We want defaults start calendar input box 30 days prior to current date and the end calendar input box to be the current date. Here is my date vars.
...