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java - What is a NullPointerException, and how do I fix it?

question from:https://stackoverflow.com/questions/65871378/why-is-this-toarray-method-not-working...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to calculate total time difference for rows with same name using a pandas dataframe?

I have an excel file with Patient names and Dates. For example: Column A=[1000, 1000, 1001, 1001, 1001, 1002, ... -total-time-difference-for-rows-with-same-name-using-a-pandas-da...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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winforms - Is it possible to incorporate variables into a C# switch{case} statement

This question already has answers here: question from:https://stackoverflow.com/questions/65871330/is-it-possible-to-incorporate-variables-into-a-c-sharp-switchcase-statement...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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how to set the sha256 hex in envoy wasm remote config

As the below image shown, I want to load remote wasm in envoy filter, and I put the value in sha256 field, which ... /65871312/how-to-set-the-sha256-hex-in-envoy-wasm-remote-config...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Want to shorten links using bitly api with js

So, I am using Zapier.com for my High school project. in which inside the zapier it has a Node js server ... com/questions/65871297/want-to-shorten-links-using-bitly-api-with-js...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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typescript - Assert class has only properties of an interface

How to make sure a class implements an interface, and has no properties besides those needed to implement ... questions/65871292/assert-class-has-only-properties-of-an-interface...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Is it possible to centre the actionbar title from a fragment using AndroidX navigation?

Currently, I am using the Navigation component from Android and the actionbar title is displayed on the left. ... centre-the-actionbar-title-from-a-fragment-using-androidx-navi...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Increase the size of SVG in HTML without losing the size of the edges of the shape

When I resize SVG with CSS, their rounded corners also resize. Like the image below, I also put the code. My Problem ... -in-html-without-losing-the-size-of-the-edges-of-the-sha...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vb.net - Accelerate program: How do I find xmin, xmax, ymin and ymax from a Drawing2D.GraphicsPath?

I'm drawing a Drawing2D.GraphicsPath freehand (?selbstgezeichneterPath ). This is definitely a simple, closed figure. From ... -find-xmin-xmax-ymin-and-ymax-from-a-drawing2d-gra...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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function - Restart or cancel input() [Python]

I want to restart the input('CLIENT >> ') when the client recieves a message from the server and the ... https://stackoverflow.com/questions/65871178/restart-or-cancel-input-python...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ssl - How to expose vault HTTPS API that installed in k8s to outside clients

i have a problem finding explanations on how to expose HTTPS API to outside clients. The Vault on Kubernetes Reference ... -vault-https-api-that-installed-in-k8s-to-outside-clients...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Delete corresponding values with different Keys from Dictionary

I am new to python and I am writing Flight Booking system program .I got stuck up on delete ... /questions/65871161/delete-corresponding-values-with-different-keys-from-dictionary...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to transform a map to map in Terraform

I have a map in Terraform, values of which I want to transform by prepending them with a string, resulting in ... /questions/65871005/how-to-transform-a-map-to-map-in-terraform...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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arrays - Error in generating a valid json recursive javascript function

I have a function to generate an object which I'm transforming to a JSON later on: function ... 65870936/error-in-generating-a-valid-json-recursive-javascript-function...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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863 views

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uwp xaml - UWP Loading indicator does not appear

I have a UWP application and I want to show a content dialog while loading data. This is my loading ... /stackoverflow.com/questions/65870911/uwp-loading-indicator-does-not-appear...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Different between the two initialization of char pointers

#include <iostream> using namespace std; int main() { char* s = 0; char *t = ""; cout<< ... .com/questions/65870885/different-between-the-two-initialization-of-char-pointers...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Animation in Streambuilder to display Firebase Content

I want to add some animation upon addition or removal of an object (that is constructed using ... /questions/65870830/animation-in-streambuilder-to-display-firebase-content...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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asp.net core - The instance of entity type 'x' cannot be tracked because another instance with the same key value for {'a', 'b'} is already being tracked

I got the error in the title while editing relational table between many-to-many relationship. It will not let ... of-entity-type-x-cannot-be-tracked-because-another-instance-with...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Extract string from text file via Powershell

I have been trying to extract certain values from multiple lines inside a .txt file with PowerShell. Host ... 65870786/regex-in-powershell-outputing-things-outside-the-regex-match...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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intellij plugin - PsiReferenceContributor not catching element

I have a simple test class: public class Test { public void foo() { Object a = ... https://stackoverflow.com/questions/65870661/psireferencecontributor-not-catching-element...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can i permanently add a color code o that i can use it in different projects in android studio?

Can I permanently add a color code in android studio so that I and use it in different projects in android studio? ... color-code-o-that-i-can-use-it-in-different-projects-in...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to create a widget that stays alive on all screens? Like spotify's miniplayer

I'm currently building a podcast app and what I want to implement is something similar to miniplayer in Spotify. ... -widget-that-stays-alive-on-all-screens-like-spotifys-miniplaye...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Doughnut pie hybrid d3 version 4

I have an old doughnut hybrid pie chart/bubble chart combo working on d3v3. //doughnut bubble chart v3 ... /stackoverflow.com/questions/65870599/doughnut-pie-hybrid-d3-version-4...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reference - value not updated when incrementing mutable ref

Below is an extract of code : (the problem is visible by testing only this extract) let cptIdCO = ref ... .com/questions/65870593/value-not-updated-when-incrementing-mutable-ref...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Onclick with window.onload function

I've no idea if this is the right way to do what I'm trying to do (I have 0 experience ... from:https://stackoverflow.com/questions/65871500/onclick-with-window-onload-function...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Query of MySQL database it does not work correctly with if conditional?

I want to select value from MySQL database, and if the value equal to wait then print something. It is simple ... -of-mysql-database-it-does-not-work-correctly-with-if-conditional...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - I am writing a program for a sample test at hackerRank but my loop is not working or i must say i am receiving only one output

Here is the code def fizzBuzz(n): n = list(range(1,n+1)) for numbers in n: m3 = numbers / 3 m5 = numbers ... -a-program-for-a-sample-test-at-hackerrank-but-my-loop-is-not-workin...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Livedata doesn't update data in fragment correctly

I have tablayout and 2 fragments in separate tabs. Fragment A have an overridden method that returns data ... /questions/65871386/livedata-doesnt-update-data-in-fragment-correctly...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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