Recent questions tagged Java

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Another Big O notation question...What is the Big O for the folling code: for (int i = n; i > 0; i = i ... as mulitply the Big O of each loop? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Clone textview to append it to a ViewGroup

I have a ViewGroup defined in XML with a view inside, at onCreate time I'd like to have a variable of those. I ... ); } But it is not working. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JTree: how to get the text of selected item?

How can I get the text of selected item in a JTree? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Adding @NotNull or Pattern constraints on List<String>

How can we ensure the individual strings inside a list are not null/blank or follow a specific pattern @NotNull List< ... not seem to do the job See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android: Limiting EditText to numbers

When creating an EditText in the java portion of the application, how do you limit it to numbers like ... android:inputType="numberDecimal"/> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I fill an array with consecutive numbers

I would like to fill an array using consecutive integers. I have created an array that contains as much indexes ... All help is appreciated!!! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - String.replaceAll Strange Behaviour

String s = "hi hello"; s = s.replaceAll("\s*", " "); System.out.println(s); I have the code above, ... l l o rather than hi hello Many thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to make a POST request using retrofit 2?

I was only able to run the hello world example (GithubService) from the docs. The problem is when I run my code, I get ... ------"); } }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get dialog size?

I am looking for a way to get size of a custom dialog. I went through this question, but the only answer ... the siye for the background image. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JPA many to many with extra column

I have a following problem that I need to solve. The core issues is that I want to add additional ... additional column in join table See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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661 views

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java - Clone JavaFX Node?

I have created a Node (AnchorPane) in the JavaFX scene builder and was wondering how to clone it. I saw ... to achieve this in JavaFX 2? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to implement "instanceOf" in JSTL

or say get class name or get type name so that can work on major popular web container/servers? Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Libs for HTML sanitizing

I'm looking for a html sanitizer which I can call per API to sanitise strings which I get from my webapp. ... find unclosed tags and close them. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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java - Spring ResponseEntity

I have a use case where I need to return a PDF to a user which is generated for us. It seems that what I need ... to have to bring it in at all. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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375 views

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java - PowerMock's expectNew() isn't mocking a constructor as expected

I'm trying to learn the ins and outs of various mocking libraries and PowerMock(specifically the EasyMock ... exception was never thrown. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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460 views

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java - Is there a reason to explicitly code a default constructor when there are no other constructors?

I recently saw this constructor in a class: public MyClass(){ } There were no other constructors. Is there a reason ... 't have a default...? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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856 views

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java - how to parse unquoted JSON string

I have a JSON string where neither the keys nor the values are quoted and I would like to transform it to a ... Jackson but it does not work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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323 views

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java - Practical GUI toolkit?

I am thinking about cross-platform with nice programming language bindings (Java, Ruby and Python). What would be the " ... FOX, wx, Tk or Qt? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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635 views

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java - What does "retained size" mean in jVisualVM's memory inspector?

Jvisualvm heap dump on summary tab has functionality to inspect bigest objects by retained size. What does ... application objects? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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327 views

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java - Why doesn't HtmlUnitDriver execute JavaScript?

I got the following problem: I am running a JUnit testCase with Selenium 2.9 using HtmlUnitDriver with Browserversion ... right way to do this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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410 views

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java - Groovy Generics failure

Besides groovy is way more dynamic then java... Why is this a compile time error in groovy (unexpected token <) ... I write this the groovy way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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438 views

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java - Writing at the end of a file via opencsv

I'm using opencsv and want to write to a .csv file through multiple sessions. However every time I start a ... instead of replacing the file? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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414 views

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java - Jackson ignore all properties of superclass from external library

I am developing using an ORM where I extend a base orm class to create tables. For example: public class Person ... is in an external library. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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439 views

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java - What do the different (HotSpot) JVM thread types do?

I see there are six thread types implemented into the HotSpot JVM: VMThread, CGCThread, PGCThread, JavaThread, ... what about other JVMs? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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283 views

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java - ClassNotFoundException FreeMarkerConfigurationFactory

I have a big web application that uses FreeMarker. When I recently updated to Spring 3.2.4 and ran the web app via ... true"/> </bean> </beans> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

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java - RESTEASY003145: Unable to find a MessageBodyReader of content-type application/json and type class org.keycloak.representations.AccessTokenResponse

I'm trying to test Keycloak REST API. Instaled the version 2.1.0.Final. I can access the admin through ... version> </dependency> Any clues? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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407 views

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java - Flyway: Cannot find migrations location in: [classpath:db/migration]

I created an new project with springboot2.2.0.M2 / Flyway 5.2.4 / Java8. After try to start my project i got : ... -2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework....

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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346 views

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java - Does Collections.sort keep order on equal elements?

I have a list of objects ordered by a date parameter and want to reorder them by category parameter, but keeping ... (elementB.category)? } }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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