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

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java - What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?

I have a Map which is to be modified by several threads concurrently. There seem to be three ... and ConcurrentHashMaps? Which one fits which situation? Question&Answers:os...

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

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git - What is the difference between merge --squash and rebase?

I'm new to git and I'm trying to understand the difference between a squash and a rebase. As I understand it you perform a squash when doing a rebase. Question&Answers:os...

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

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javascript - Passing environment-dependent variables in webpack

I'm trying to convert an angular app from gulp to webpack. in gulp I use gulp-preprocess to replace some ... way of achieving a similar result with webpack? Question&Answers:os...

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

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What does "hashable" mean in Python?

I tried searching internet but could not find the meaning of hashable. When they say objects are hashable or hashable objects what does it mean? Question&Answers:os...

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

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android - Retrieve database or any other file from the Internal Storage using run-as

On a non-rooted android device, I can navigate to the data folder containing the database using the run-as ... might be a more direct solution to begin with Question&Answers:os...

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

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ios - Async image loading from url inside a UITableView cell - image changes to wrong image while scrolling

I've written two ways to async load pictures inside my UITableView cell. In both cases the image will load fine but ... want with image } }]; return cell; } Question&Answers:os...

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

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ios - Figure out size of UILabel based on String in Swift

I am trying to calculate the height of a UILabel based on different String lengths. func calculateContentHeight() -> ... answer in Swift and not Objective C. Question&Answers:os...

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

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design patterns - Implementing Singleton with an Enum (in Java)

I have read that it is possible to implement Singleton in Java using an Enum such as: public enum MySingleton ... instantiated? Who is doing new MySingleton()? Question&Answers:os...

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

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How to Display blob (.pdf) in an AngularJS app

I have been trying to display pdf file which I am getting as a blob from a $http.post response. The pdf ... pdf viewer libraries out there weren't an option. Question&Answers:os...

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

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wpf - Pushing read-only GUI properties back into ViewModel

I want to write a ViewModel that always knows the current state of some read-only dependency properties from the ... changes to the view's read-only properties? Question&Answers:os...

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

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c# - Difference in months between two dates

How to calculate the difference in months between two dates in C#? Is there is equivalent of VB's DateDiff() ... might give me a wrong value. Any suggestions? Question&Answers:os...

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

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How do I create a dynamic key to be added to a JavaScript object variable

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

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python - How to check for valid email address?

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

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How to calculate rolling / moving average using python + NumPy / SciPy?

There seems to be no function that simply calculates the moving average on numpy/scipy, leading to convoluted ... have the batteries included in this case? Question&Answers:os...

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

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Checking if a number is a prime number in Python

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

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java - How to create a jar with external libraries included in Eclipse?

I am done with the project which connects to database (MySQL). Now I want to export the project as jar. But I ... Eclipse or should I use any scripts for that?. Question&Answers:os...

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

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How to access PHP variables in JavaScript or jQuery rather than <?php echo $variable ?>

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

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SQL Server 2012 column identity increment jumping from 6 to 1000+ on 7th entry

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

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memory management - Is it necessary to use autoreleasepool in a Swift program?

On page 17 of this WWDC14 presentation, it says Working with Objective-C? Still have to manage autorelease pools ... first } (like some other languages does)? Question&Answers:os...

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

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338 views

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regex - Python non-greedy regexes

How do I make a python regex like "(.*)" such that, given "a (b) c (d) e" python matches "b" instead ... to tell python "hey, match this as soon as possible"? Question&Answers:os...

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

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java - Dynamic spring data jpa repository query with arbitrary AND clauses

I'm using Spring data jpa repositories, Got a requirement to give search feature with different fields. ... implement search option with optional fields ? Question&Answers:os...

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

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How are maven scopes mapped to ivy configurations by ivy

Maven repositories, like Maven Repository offer the widest range of projects for dependency management. Ivy offers the ... to an ivy conf / configuration? Question&Answers:os...

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

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floating point - What range of numbers can be represented in a 16-, 32- and 64-bit IEEE-754 systems?

I know a little bit about how floating-point numbers are represented, but not enough, I'm afraid. The general ... or +/- 0.0005 (the thousandths place). Question&Answers:os...

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

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c# - What is the difference between null and System.DBNull.Value?

Is there any difference between null and System.DBNull.Value? If yes, what is it? I noticed this ... the difference between null and System.DBNull.Value? Question&Answers:os...

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

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70 views

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javascript - Is it spread "syntax" or the spread "operator"?

I've heard ... referred to both as 'spread syntax' and 'the spread operator', with the latter being ... , and why? What about array destructuring assignment? Question&Answers:os...

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

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AngularJS: ng-model not binding to ng-checked for checkboxes

I referred to this before asking this question. AngularJs doesn't bind ng-checked with ng-model If ng-checked ... 't check any checkboxes. Thanks in advance! Question&Answers:os...

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

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java - Display indeterminate JProgressBar while batch file runs

I've been browsing SO and google for a while now for an answer to this question, but I can't seem to ... that a process is still running. Thoughts? Thanks! Question&Answers:os...

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

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