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java - Find if a number is a power of two without math function or log function

I want to find if a user entered number is a power of two or not. My code doesn't work. public class power_of_two { ... not a power of 2, etc.. See Question&Answers more detail:os...

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

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Slack API team invitation

I am looking for a call which could send a Slack team invitation email to a new user from my application. ... invitations I can start using it. See Question&Answers more detail:os...

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

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spring property substitution for test and production

I ran into this for property substitution in spring <context:property-placeholder location="esb-project-config. ... files? thanks, Dean See Question&Answers more detail:os...

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

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symfony - symfony2 chained selectors

I have three entities: Country, State and City with the following relationships: When creating a City, ... "TestTestBundleEntityCity" Any ideas? See Question&Answers more detail:os...

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iphone - How to Maintain VOIP socket connection in background?

My App Requirement: I should maintain a socket connection to trigger local notification on server push without ... work as per expectation? See Question&Answers more detail:os...

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

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npm - webpack is not recognized as a internal or external command,operable program or batch file

I am Learning React.js and i am using windows 8 OS.i have navigate to my root folder 1.Created the ... command,operable program or batch file See Question&Answers more detail:os...

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android - Are there conventions on how to name resources?

Are there conventions how to name resources in Android? For example, buttons, textViews, menus, etc. See Question&Answers more detail:os...

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the MySQL service on local computer started and then stopped

the MySQL service on local computer started and then stopped. Some services stop automatically if they are not ... resolve this issue? Thanks. See Question&Answers more detail:os...

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

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php - Get Image Height and Width as integer values?

I've tried to use the PHP function getimagesize, but I was unable to extract the image width and height as an ... . How can I achieve this? See Question&Answers more detail:os...

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How do I load a PHP file into a variable?

I need to load a PHP file into a variable. Like include(); I have loaded a simple HTML file like this: $Vdata = ... I need to load a PHP file. See Question&Answers more detail:os...

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math/algorithm Fit image to screen retain aspect ratio

I need help with math / algorithm to take an image of known size and fit to one of two screen dimensions: ... that is clear enough. Thanks! See Question&Answers more detail:os...

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device mapper - Clean docker environment: devicemapper

I have a docker environment with 2 containers (Jenkins and Nexus, both with their own named volume). I ... clean this without breaking stuff? See Question&Answers more detail:os...

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javascript - Creating a private chat between a key using a node.js and socket.io

How do I emit a message to all users in a private chat sharing a conversation_id using node.js and socket.io? var ... ) }); server.listen(8080); See Question&Answers more detail:os...

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http - CURL Command Line URL Parameters

I am trying to send a DELETE request with a url parameter using CURL. I am doing: curl -H application/x-www- ... point out what I'm doing wrong? See Question&Answers more detail:os...

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database - SQL ON DELETE CASCADE, Which Way Does the Deletion Occur?

If I have two relations in a database, like this: CREATE TABLE Courses ( CourseID int NOT NULL PRIMARY KEY, ... is it the other way around? See Question&Answers more detail:os...

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c# - is vs typeof

Which of these pieces of code is faster? if (obj is ClassA) {} if (obj.GetType() == typeof(ClassA)) {} ... that they don't do the same thing. See Question&Answers more detail:os...

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

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python - Seaborn showing scientific notation in heatmap for 3-digit numbers

I'm creating a heatmap from a pandas pivot_table as below: table2 = pd.pivot_table(df,values='control', ... the numbers in plain notation? See Question&Answers more detail:os...

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Registry key Error: Java version has value '1.8', but '1.7' is required

While running sencha app build production I am getting the following error: Error: Registry key 'SoftwareJavaSoftJava ... the problem persist. See Question&Answers more detail:os...

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

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Best way to handle multiple constructors in Java

I've been wondering what the best (i.e. cleanest/safest/most efficient) way of handling multiple constructors in ... good" way of doing things? See Question&Answers more detail:os...

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Quitting node.js gracefully

I'm reading through the excellent online book http://nodebeginner.org/ and trying out the simple code var http = ... the mess I've created? See Question&Answers more detail:os...

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

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ios - add Shadow on UIView using swift 3

prior swift 3 i was adding shadow in my UIView like this : //toolbar is an UIToolbar (UIView) toolbar.layer. ... add shadow in swift 3 ? See Question&Answers more detail:os...

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

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Python class @property: use setter but evade getter?

In python classes, the @property is a nice decorator that avoids using explicit setter and getter functions. However, ... 44 ns on average. See Question&Answers more detail:os...

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

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linux - How to set an environment variable only for the duration of the script?

On Linux (Ubuntu 11.04) in bash, is it possible to temporarily set an environment variable that will only be ... , and then launching the app. See Question&Answers more detail:os...

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

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c# - TargetedPatchingOptOut: "Performance critical to inline across NGen image boundaries"?

Been going through some framework classes using reflector and noticed a number of the methods and properties have the ... and any other context? See Question&Answers more detail:os...

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

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javascript - How does setTimeout work in Node.JS?

I guess that once it's executed it's on the queue, but in the queue is there any assurance it will invoke ... higher on the queue delay it? See Question&Answers more detail:os...

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html - Alternate background colors for list items

I have a list, and each item is linked, is there a way I can alternate the background colors for each item? <ul> <li> ... >Link 5</a></li> </ul> See Question&Answers more detail:os...

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

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java - Why can a class not be defined as protected?

Why can we not define a class as protected? I know that we can't, but why? There should be some specific reason. See Question&Answers more detail:os...

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

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javascript - export html table to csv

I am trying to add a feature of csv download option in my website. It should convert the html table present in ... js without the use of php?? See Question&Answers more detail:os...

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

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