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java - Initialize a static final field in the constructor

public class A { private static final int x; public A() { x = 5; } } final means the variable can ... those keywords interfere with each other? See Question&Answers more detail:os...

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Where does MySQL store database files on Windows and what are the names of the files?

I accidentally formatted my hard drive and re-installed Windows and forgot to backup an important database I had in my ... , but not 100% sure. See Question&Answers more detail:os...

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c# - how to list all sub directories in a directory

I'm working on a project and I need to list all sub directories in a directory for example how could I list all the sub directories in c: See Question&Answers more detail:os...

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Javascript errors from Google Adsense

On several of my adsense running sites, I have been getting the following errors: Unable to post message to [http://] ... as I'm a new user) See Question&Answers more detail:os...

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python - Is there a way to make the Tkinter text widget read only?

It doesn't look like it has that attribute, but it'd be really useful to me. See Question&Answers more detail:os...

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python - How to disable password request for a Jupyter notebook session?

I have been launching Jupyter Notebook for years using the following command: jupyter-notebook --port=7000 --no- ... This solved the problem! See Question&Answers more detail:os...

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r - Library is not writable

I have this issue during package installation in R version 3.0.2 (2013-09-25) on an Ubuntu machine: install. ... not writable How to resolve it? See Question&Answers more detail:os...

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recursion - Implement recursive lambda function using Java 8

Java 8 introduced lambda functions and I want to implement something like factorial: IntToDoubleFunction fact = x -> x ... : It is called fact. See Question&Answers more detail:os...

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In Scala, what does "view" do?

Specifically I'm looking at Problem 1 here http://pavelfatin.com/scala-for-project-euler/ The code as ... produces exactly the same answer. See Question&Answers more detail:os...

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c++ - MinGW .exe requires a few gcc dll's regardless of the code?

When compiling with MinGW, I have to copy over certain dll files from the MinGW bin directory before the exe will run ... << endl; return 0; } See Question&Answers more detail:os...

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c# - Webclient / HttpWebRequest with Basic Authentication returns 404 not found for valid URL

Edit: I wanted to come back to note that the problem wasn't on my end at all, but rather with with code ... .ReadToEnd(); Response.Write(s); See Question&Answers more detail:os...

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c - Can GCC not complain about undefined references?

Under what situation is it possible for GCC to not throw an "undefined reference" link error message when trying ... exact single line of code. See Question&Answers more detail:os...

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javascript - How do I add button on each row in datatable?

I am newbie for DataTables. I want to add button on each row for edit and delete(like below image) I have tried with code: ... ", "1", "" ] ] } See Question&Answers more detail:os...

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c - What is the use of typedef?

What is the use of typedef keyword in C ? When is it needed? See Question&Answers more detail:os...

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angularjs - Alternative to ng-show/-hide or how to load only relevant section of DOM

When using ng-show/-hide, the content included in those blocks initially displays on the user screen. Only after ... based on the current state. See Question&Answers more detail:os...

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c++ - Is make_shared really more efficient than new?

I was experimenting with shared_ptr and make_shared from C++11 and programmed a little toy example to see what ... the outlined copy overhead? See Question&Answers more detail:os...

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reflection - Instantiating a JavaScript object by calling prototype.constructor.apply

Let me start with a specific example of what I'm trying to do. I have an array of year, month, day, hour ... ? I'm testing with Firefox BTW. See Question&Answers more detail:os...

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html - How to display and hide a div with CSS?

In my script there are three divs. I want to display div with class="ab" when I hover on first line and ... class="abc">Second content</div> See Question&Answers more detail:os...

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c++ - Use-cases of pure virtual functions with body?

I recently came to know that in C++ pure virtual functions can optionally have a body. What are the real-world use cases for such functions? See Question&Answers more detail:os...

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python pandas- apply function with two arguments to columns

Can you make a python pandas function with values in two different columns as arguments? I have a function that ... 'ResponseCol']), axis=1) See Question&Answers more detail:os...

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javascript - Three.JS wireframe material - all polygons vs. just edges

I'm using ThreeJS in a project and noticed that older versions render wireframes differently than newer versions, ... are other differences). See Question&Answers more detail:os...

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ios - How to merge two UIImages?

I am trying to merge two different images and create a new one. This is the way I would like to do: I have ... (B) that i took become stretched! See Question&Answers more detail:os...

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android - Stop ScrollView from auto-scrolling to an EditText

Seems to be a common problem without a great solution that I have found. Goal is to stop a ScrollView ... keyboard gets hidden or something. See Question&Answers more detail:os...

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build automation - Multiple settings gradle files for multiple projects building

I have the following project structure -->Starnderd Location -->Project1 -->settings.gradle -->build.gradle --> ... I'm doing here wrong? See Question&Answers more detail:os...

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c# - Construct LambdaExpression for nested property from string

I am trying to create a lambda expression for a nested property at run-time from the name of the propert. Basically ... to do this at run-time. See Question&Answers more detail:os...

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Sending string via socket (python)

I have two scripts, Server.py and Client.py. I have two objectives in mind: To be able to send data again ... source code of the whole thing. See Question&Answers more detail:os...

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python - How to specify upper and lower limits when using numpy.random.normal

I want to be able to pick values from a normal distribution that only ever fall between 0 and 1. In some cases ... a better way of doing this. See Question&Answers more detail:os...

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Laravel 4: Failed to open stream: Permission denied

I'm having problem in setting up Laravel 4. I'm having this error when opening the index page: file_put_contents(/ ... . What am I missing here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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