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java - Why do this() and super() have to be the first statement in a constructor?

Java requires that if you call this() or super() in a constructor, it must be the first statement. ... not have this restriction, something bad would happen? Question&Answers:os...

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

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Split string with multiple delimiters in Python

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

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web.xml - Sometimes I see JSF URL is *.jsf, sometimes *.xhtml and sometimes /faces/*. Why?

Been try to learn JSF, and sometimes I see the URL is *.jsf and sometimes is *.xhtml or /faces/*. Can ... .xhtml, so where does .jsf URL extension come from? Question&Answers:os...

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

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how to create a contiguous 2d array in c++?

I want to create a function that returns a contiguous 2D array in C++. It is not a problem to create the array using ... I declare a 2d array in C++ using new? Question&Answers:os...

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

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dependency injection - Is there a pattern for initializing objects created via a DI container

I am trying to get Unity to manage the creation of my objects and I want to have some initialization parameters ... ? Edit: Described the interface a bit more. Question&Answers:os...

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

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How can I stop the browser back button using JavaScript?

I am doing an online quiz application in PHP. I want to restrict the user from going back in an exam. I ... for disabling the back button. What is my problem? Question&Answers:os...

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

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jar - What causes java.lang.IncompatibleClassChangeError?

I'm packaging a Java library as a JAR, and it's throwing many java.lang.IncompatibleClassChangeErrors when I ... kinds of problems could be causing this error? Question&Answers:os...

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

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c# - 'await' works, but calling task.Result hangs/deadlocks

I have the following four tests and the last one hangs when I run it. Why does this happen: [Test] public void ... set; } } Why does the last test hang? Question&Answers:os...

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

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How to get Url Hash (#) from server side

I know on client side (javascript) you can use windows.location.hash but could not find anyway to access from the server side. I'm using asp.net. Question&Answers:os...

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

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Parameter evaluation order before a function calling in C

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

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css - How do I create an HTML table with a fixed/frozen left column and a scrollable body?

I need a simple solution. I know it's similar to some other questions, like: HTML table with fixed headers ... would prefer a simple and script-less solution. Question&Answers:os...

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

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java - How do you make a deep copy of an object?

It's a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference? Question&Answers:os...

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

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oop - What is the difference between association, aggregation and composition?

What is the difference between association, aggregation, and composition? Please explain in terms of implementation. Question&Answers:os...

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

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python - Are for-loops in pandas really bad? When should I care?

Are for loops really "bad"? If not, in what situation(s) would they be better than using a more conventional ... . This post aims to capture this for posterity. Question&Answers:os...

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

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java - Make copy of an array

I have an array a which is constantly being updated. Let's say a = [1,2,3,4,5]. I need to make an exact ... copy, etc., because I do not know what that means. Question&Answers:os...

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

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javascript - How can you programmatically tell an HTML SELECT to drop down (for example, due to mouseover)?

How can you programmatically tell an HTML select to drop down (for example, due to mouseover)? Question&Answers:os...

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

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java - Socket using in a swing applet

I should made a server & client in Java,based on Swing and gui.I neeed to make somehow a socket that will go ... example or can explain how is it being done? Question&Answers:os...

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

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How to change an application icon programmatically in Android?

Is it possible to change an application icon directly from the program? I mean, change icon.png in the ... see the previously selected icon in the launcher. Question&Answers:os...

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

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627 views

1 answer

linux - How to convert DOS/Windows newline (CRLF) to Unix newline (LF) in a Bash script

How can I programmatically (i.e., not using vi) convert DOS/Windows newlines to Unix? The dos2unix and unix2dos ... these with commands like sed, awk, and tr? Question&Answers:os...

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

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python - Converting a list to a set changes element order

Recently I noticed that when I am converting a list to set the order of elements is changed and is sorted ... Set Difference) without losing the initial order? Question&Answers:os...

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

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groovy - How to access java-classes in the default-package?

I'm working now together with others in a grails project. I have to write some Java-classes. But I need access ... package from a Java-class in a named package? Question&Answers:os...

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

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python - Why does on_message stop commands from working?

Basically, everything appears to work fine and start up, but for some reason I can't call any of the commands. ... , but it just won't call the commands. Question&Answers:os...

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

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286 views

1 answer

git log - Pretty Git branch graphs

I've seen some books and articles have some really pretty looking graphs of Git branches and commits. How ... high-quality printable images of Git history? Question&Answers:os...

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

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97 views

1 answer

How to change the URI (URL) for a remote Git repository?

I have a repo (origin) on a USB key that I cloned on my hard drive (local). I moved "origin" to a NAS and ... the old one (I fear I'll break my history). Question&Answers:os...

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

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hash - C++ unordered_map using a custom class type as the key

I am trying to use a custom class as key for an unordered_map, like the following: #include <iostream> #include < ... do it. How can I accomplish this tasks? Question&Answers:os...

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

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89 views

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c# - Performance differences between debug and release builds

I must admit, that usually I haven't bothered switching between the Debug and Release configurations in my ... will also work fine under Release configuration. Question&Answers:os...

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

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Is it possible to use Java 8 for Android development?

Searching the web, it is not clear if Java 8 is supported for Android development or not. Before I download ... is or is not supported for Android development. Question&Answers:os...

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

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172 views

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python - How do lexical closures work?

While I was investigating a problem I had with lexical closures in Javascript code, I came along this problem in Python: ... point. Still, it prints "4 4 4". Question&Answers:os...

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

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