大约有 40,000 项符合查询结果（耗时：0.0629秒） [XML]
What's the difference between lists and tuples?
.... A list on the other hand could be used to store multiple locations. Naturally one might want to add or remove locations from the list, so it makes sense that lists are mutable. On the other hand it doesn't make sense to add or remove items from an existing location - hence tuples are immutable.
T...
How do I use the new computeIfAbsent function?
...onacci(0)
memo.put(1,1L); //fibonacci(1)
}
And for the inductive step all we have to do is redefine our Fibonacci function as follows:
public static long fibonacci(int x) {
return memo.computeIfAbsent(x, n -> fibonacci(n-2) + fibonacci(n-1));
}
As you can see, the method computeIfAbsen...
How to cancel a local git commit
...
By the way, this is called --mixed in the manual.
– Josh Lee
Jan 31 '11 at 17:58
11
...
Maven command to list lifecycle phases along with bound goals?
...n wrong, but this command is the "reverse lookup" to the question (Listing all phases this goal is in)? link says "Displays a list of the attributes for a Maven Plugin and/or goals (aka Mojo - Maven plain Old Java Object)."
– user2039709
Nov 17 '16 at 13:45
...
Catch a thread's exception in the caller thread in Python
I'm very new to Python and multithreaded programming in general. Basically, I have a script that will copy files to another location. I would like this to be placed in another thread so I can output .... to indicate that the script is still running.
...
Pass An Instantiated System.Type as a Type Parameter for a Generic Class
...
OK, this is good, but how does one go about calling methods on created? More reflection?
– Robert C. Barth
Nov 5 '08 at 20:38
7
...
Hibernate openSession() vs getCurrentSession()
....) The author suggests the use of filter. In his filter code, he doesn't call openSession() or close(). He only calls getCurrentSession(). I guess he sets current_session_context to thread. Now I think I understand getCurrentSession(). However, I don't know when should I use openSession().
...
Design for Facebook authentication in an iOS app that also accesses a secured web service
Goal:
Allow a user to authentication with Facebook into an iOS application which requires access to a protected web service that I'm running.
...
Why does Internet Explorer not send HTTP post body on Ajax call after failure?
...en a new connection. This can have a significant performance impact, especially on high latency networks.
The issue is triggered easily if Ajax requests are made in rapid succession. For example, we make Ajax requests every 100ms and then the network status changes, the error is easy to reproduce. A...
What's the difference between findAndModify and update in MongoDB?
...you will get back a different item than what you updated.
Doing it "atomically" means you are guaranteed that you are getting back the exact same item you are updating - i.e. no other operation can happen in between.
share
...