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java - NullPointerException accessing views in onCreate()

This is a canonical question for a problem frequently posted on StackOverflow. I'm following a tutorial. I've created ... ="@+id/something" /> </RelativeLayout> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Loop doesn't see value changed by other thread without a print statement

In my code I have a loop that waits for some state to be changed from a different thread. The other thread ... println("waiting"); statement. What's going on? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Selenium Web Driver & Java. Element is not clickable at point (x, y). Other element would receive the click

I used explicit waits and I have the warning: org.openqa.selenium.WebDriverException: Element is not clickable at ... (TitleResultPage)).getText(), Text); } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Asynchronous vs synchronous execution, what is the main difference?

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asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Convert bytes to a string

I'm using this code to get standard output from an external program: >>> from subprocess import * >>> command_stdout = ... I'd like it to be OK with Python 3. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Why don't self-closing script elements work?

What is the reason browsers do not correctly recognize: <script src="foobar.js" />  ... at least for all IE (6-8 beta 2). Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Ignoring time zones altogether in Rails and PostgreSQL

I'm dealing with dates and times in Rails and Postgres and running into this issue: The database is in UTC. ... just ignore time zones all around. Any ideas? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to parse invalid (bad / not well-formed) XML?

Currently, I'm working on a feature that involves parsing XML that we receive from another product. I decided to run ... Any ideas on a way to parse such input? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I add a blank directory to a Git repository?

How can I add a blank directory (that contains no files) to a Git repository? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - What is an example of the Liskov Substitution Principle?

I have heard that the Liskov Substitution Principle (LSP) is a fundamental principle of object oriented design. What ... and what are some examples of its use? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - List comprehension vs map

Is there a reason to prefer using map() over list comprehension or vice versa? Is either of them ... or considered generally more pythonic than the other? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to group dataframe rows into list in pandas groupby

I have a pandas data frame df like: a b A 1 A 2 B 5 B 5 B 4 C 6 I want to group by the ... 6] Is it possible to do something like this using pandas groupby? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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I have upgraded my system and have installed MySql 5.7.9 with php for a web application I am working on. I ... do? Let me know if you need more information. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why are AngularJS $http success/error methods deprecated? Removed from v1.6?

The AngularJS documentation has a Deprecation Notice for the $http success and error methods. Is there a ... this abstraction was removed from the library? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?

I am trying to support CORS in my Node.js application that uses the Express.js web framework. I have read a ... set the headers in my main app.get block? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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debugging - In Visual Studio C++, what are the memory allocation representations?

In Visual Studio, we've all had "baadf00d", have seen seen "CC" and "CD" when inspecting variables ... set to recognizable byte patterns for debugging purpose? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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debugging - Accessing console and devtools of extension's background.js

I just started out with Google Chrome extensions and I can't seem to log to console from my background js. When ... logged to console. What am I doing wrong? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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winforms - Communicate between two windows forms in C#

I have two forms, one is the main form and the other is an options form. So say for example that the user clicks ... odd thing to do. So what is the best way? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Hide scroll bar, but while still being able to scroll

I want to be able to scroll through the whole page, but without the scrollbar being shown. In Google Chrome it's ... whole page? With just CSS or HTML, please. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why does integer division in C# return an integer and not a float?

Does anyone know why integer division in C# returns an integer and not a float? What is the idea behind it? ( ... , integers are a very small subset of which.) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Limiting floats to two decimal points

I want a to be rounded to 13.95. >>> a 13.949999999999999 >>> round(a, 2) 13.949999999999999 The round function does not work the way I expected. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why do I have to access template base class members through the this pointer?

If the classes below were not templates I could simply have x in the derived class. However, with the code below, I have ... derived<int> d; d.f(); return 0; } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Change column type in pandas

I want to convert a table, represented as a list of lists, into a Pandas DataFrame. As an extremely ... each columns contains values of the same type. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Split (explode) pandas dataframe string entry to separate rows

I have a pandas dataframe in which one column of text strings contains comma-separated values. I want to split each CSV ... = a.groupby('idx') z.transform(fun) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do the post increment (i++) and pre increment (++i) operators work in Java?

Can you explain to me the output of this Java code? int a=5,i; i=++a + ++a + a++; i=a++ + ++a + ... (a); System.out.println(i); The output is 20 in both cases Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Short circuit Array.forEach like calling break

[1,2,3].forEach(function(el) { if(el === 1) break; }); How can I do this using the new ... break. break crashes and return does nothing but continue iteration. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is a segmentation fault?

What is a segmentation fault? Is it different in C and C++? How are segmentation faults and dangling pointers related? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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coding style - When is JavaScript's eval() not evil?

I'm writing some JavaScript code to parse user-entered functions (for spreadsheet-like functionality). Having parsed the formula ... , when it is OK to use it? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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