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java - Difference between paint, paintComponent and paintComponents in Swing

What is the actual difference between paint(), paintComponent() and paintComponents() in Java Swing? I tried to ... in Oracle docs but I am not clear. Question&Answers:os...

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

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r - Calculate cumulative sum (cumsum) by group

With data frame: df <- data.frame(id = rep(1:3, each = 5) , hour = rep(1:5, 3) , value = sample(1:15) ... 25 15 3 5 12 37 How can I do this efficiently? Thanks! Question&Answers:os...

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c++ - the procedure entry point __gxx_personality_v0 could not be located

Editor's Note: Error messages similar to "The procedure error point ... suggests the path above. Question&Answers:os...

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

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jQuery.ajax() method's async option deprecated, what now?

As of jQuery 1.8, the use of async:false in jQuery.ajax() is deprecated. But how many webpages have you seen ... practice to me. Can I solve it another way? Question&Answers:os...

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

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c++ - Why does subtracting '0' in C result in the number that the char is representing?

Can someone explain why this works? char c = '9'; int x = (int)(c - '0'); Why does subtracting ' ... of a char result the number that that char is representing? Question&Answers:os...

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

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python - Selenium give file name when downloading

I am working with a selenium script where I am trying to download a Excel file and give it a ... ("Excel").click() # Download file Question&Answers:os...

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css - Bootstrap 3 fluid grid layout issues?

Im using Bootstrap 3 to layout my website with fluid grid, but the boxes in the grid don't line up in a row. You can see: ... . </div> </div> <?php } ?> </div> Question&Answers:os...

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

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python - Changing the formatting of a datetime axis in matplotlib

I have a series whose index is datetime that I wish to plot. I want to plot the values of the series on ... I remove them so that I get my desired formatting? Question&Answers:os...

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python - How to avoid floating point errors?

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

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python - f-strings giving SyntaxError?

I am getting an error message with my Atom reader here, where it is suggesting the first print.(f"message") ... usually {my_teeth} depending on the coffee.") Question&Answers:os...

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

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Last not empty cell (column) in the given row; Excel VBA

I have an excel sheet in which I need to find the last non empty cell in a specific row. How do I do ... Worksheets("DTCs").Range("A29").End(xlToRight).Select Question&Answers:os...

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

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c# - How to serialize a Dictionary as part of its parent object using Json.Net

I'm using Json.Net for serialization. I have a class with a Dictionary: public class Test { public string X { get ... "key1", "key2" are keys in the Dictionary? Question&Answers:os...

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firefox - How can I set default homepage in FF and Chrome via javascript?

I have a code that works only in IE anb I was looking for something similar in FF and Chrome to set user's ... find anything. Does anyone know how to do this? Question&Answers:os...

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

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java - POST to Jersey REST service getting error 415 Unsupported Media Type

I am using a JAX-RS web application with Jersey and Tomcat. Get requests are fine however when I try to post JSON ... x64 Jersey 2.17 Tomcat 7.0.62 x64 Thanks! Question&Answers:os...

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

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javascript - How to expose IFrame's DOM using jQuery?

I have a prototype representing a particual IFrame. That prototype have a function called GoToUrl(...) that opens ... but I would prefer a jQuery solution. Question&Answers:os...

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

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python - raw_input and timeout

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

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javascript - Simulation background-size: cover in canvas

I'm drawing images on a canvas like this: ctx.drawImage(data[i].image, data[i].pos.x, data[i].pos.y, data[ ... 100% (what I currently have) and cover (my goal). Question&Answers:os...

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swift - Trying to Understand Asynchronous Operation Subclass

I am trying to get started with using Operations in a side project rather than having closure-based callbacks ... me understand why these methods are declared. Question&Answers:os...

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

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android - Disable ScrollView Programmatically?

I would like to enable ScrollView and disable it by a Button Click. Disable means like if the ScrollView wasn't ... the screen. What's the solution to this? Question&Answers:os...

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php - json_decode returns NULL after webservice call

There is a strange behaviour with json_encode and json_decode and I can't find a solution: My php application calls a ... =utf-8") What could be the reason? Question&Answers:os...

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

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git - How can I prevent foxtrot merges in my 'master' branch?

A foxtrot merge is a merge where 'origin/master' merges in as a 2nd (or later) parent, like so: Commit ' ... generated using http://bit-booster.com/graph.html. Question&Answers:os...

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

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Determine file creation date in Java

There is another similar question to mine on StackOverflow (How to get creation date of a file in Java), but ... creation date/time is embedded in the name. Question&Answers:os...

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

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How to get value at a specific index of array In JavaScript?

I have an array and simply want to get the element at index 1. var myValues = new Array(); var valueAtIndex1 = ... at the 1st index of my array in JavaScript? Question&Answers:os...

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

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c# - Using Protobuf-net, I suddenly got an exception about an unknown wire-type

(this is a re-post of a question that I saw in my RSS, but which was deleted by the OP. I've re-added ... a field is causing the problem, how to debug this? Question&Answers:os...

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

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multithreading - Java Wait and Notify: IllegalMonitorStateException

I don't completely understand how wait and notify (of Object) work, and as a result I'm forced to ... suitable replacement (maybe I'm just missing something). Question&Answers:os...

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

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c++ - tellg() function give wrong size of file?

I did a sample project to read a file into a buffer. When I use the tellg() function it gives me a larger value than ... +) cout << buffer[i]; cout << endl; } Question&Answers:os...

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

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python - Why is a list comprehension so much faster than appending to a list?

I was wondering why list comprehension is so much faster than appending to a list. I thought the difference is ... The list comprehension is 50% faster. Why? Question&Answers:os...

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

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windows - How to use DoEvents() without being "evil"?

A simple search for DoEvents brings up lots of results that lead, basically, to: DoEvents is evil. Don't use it ... problems cited with DoEvents? (Or do they?) Question&Answers:os...

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

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