Recent questions tagged Java

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java - In which case could "a != a" return "true"?

java.lang.Math#min(double, double): public static double min(double a, double b) { if (a != a) return ... example. Could you please provide one? 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 - Add other components to JFrame with background

I want to add a background image to my JFrame but when I do it using the code below, I'm unable to add ... JFrame with a background ? 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 - Interface and Abstract class ad method overriding

Here is the code: interface hi { public void meth1(); } abstract class Hullo { public abstract void meth1(); ... in the abstract class and why? 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 - Character encoding in query string, hebrew

I am trying to send a GET request with query string parameter in hebrew. When the controller gets the request, the ... mapping> </web-app> -Roy 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 - Write a generic method to copy an array

For my programming assignment, I was asked to write a generic copy method to copy from one array to an identically sized ... = original[i]; } } 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 - JavaFX runtime main method

The Hello World-Tutorial of JavaFX says: The main() method is not required for JavaFX applications when the JAR ... arent there two of 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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755 views

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java - parse Solr xml files to SolrInputDocument

If I have individual files in the expected Solr format (having just ONE doc per file): <add> <doc> <field ... before indexing it with SolrJ... 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 - Spring Mvc Hibernate Encoding/Multi-line import sql

I am working on Spring MVC, On project startup i have set database to import default sql with hibernate configuration hibernate. ... /1', 3, 1). See Question&Answers more detail:os...

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

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671 views

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java - In JDK 1.6, can String equals operation can be replaced with ==?

As I study the source code of some open source products, I find code like: if (a=="cluser") a is a ... equals operation be replaced with ==? 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 - In MVC pattern, can the Model interact / modify the View?

The MVC pattern component interactions are described this way on Wikipedia: The model is responsible for managing the ... What am I missing? See Question&Answers more detail:os...

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

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849 views

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java - Avoiding Type Safety Warnings Using Hibernate Query.list()

Is it possible to avoid cast warnings after using createQuery().list? //Type safety: The expression of type List needs ... u").list(User.class); See Question&Answers more detail:os...

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

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837 views

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java - Use DecimalFormat to get varying amount of decimal places

So I want to use the Decimal Format class to round numbers: double value = 10.555; DecimalFormat fmt = new ... be rounded to 3 decimal places 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 Studio: Error:org.gradle.tooling.BuildException: Failed to generate v1 signature

The problem is arising in Android Studio 3.0. When I create a new project, everything works fine but ... problem will be greatly 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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734 views

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java - Overriding and return type compatibility

The following compiles without any problem boolean flag = true; Boolean flagObj = flag; Now imaging the following ... autoboxing apply here ? See Question&Answers more detail:os...

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

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636 views

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java - Android "Failed to find style 'mapViewStyle' in current Theme" error

I'm writing a simple android application that should display google maps. The application displays the "Activity is ... > </application> 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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796 views

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java - How can I access each key and value in JSONArray

I have a JSONArray as below. How can I access each key and value in it in order. JSONArray = [{"a":1},{"b":2,"c":3},{"d":4},{"e":5,"f":7}] See Question&Answers more detail:os...

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

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786 views

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java - How to iterate over a list of lists in jstl?

I have List in this format : List<List<Obj>> l3 = new ArrayList<List<Obj>>(); Obj contains a method called ... contained in a list of lists ? See Question&Answers more detail:os...

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

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836 views

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java - HttpSessionListener not detecting session timeout

I have an implementation of javax.servlet.http.HttpSessionListener that is supposed to detect user session invalidation/ ... class> </listener> See Question&Answers more detail:os...

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

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819 views

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java - Firestore query order on field with filter on a different field

I have a problem with query condition in google Cloud Firestore. Anyone can help me. Below is my code to get ... be the same: articleId and id See Question&Answers more detail:os...

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

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744 views

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java - How to check for an empty document on Firestore?

So I am trying to delete a document on Firebase Firestore which contains no fields. But how can I check whether ... no data before I delete it? See Question&Answers more detail:os...

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

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813 views

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java - Trying to embed vlcj media player in a WindowsCanvas inside a JPanel

I'm trying to play a video using vlcj inside a JPanel but it doesn't work for me. The message exception I ... myJPanel); } } Thanks in advance. See Question&Answers more detail:os...

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

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690 views

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java - How to select an option from a dynamic dropdown using Selenium?

I am trying to click on dropdown value to select city in from field in Make my trip http://www.makemytrip.com/. But ... -menu-item'][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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789 views

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java - Avoiding unnecessary events and infinite loop in "coupled" JSliders?

I have a GUI that is issuing commands to a web server based on slider values. Some of these sliders are " ... solution that I'm not considering? See Question&Answers more detail:os...

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

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706 views

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java - Pretty printing a method in ASM Bytecode

I am trying (with no success) to print only the contents of a given method. The following code almost does the ... . How can I accomplish that? 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 - spring boot log4j file external to jar?

how to pass? The only way I can get this to work is to put log4j.xml on the classpath. passing: ... an environment variable/property in spring. See Question&Answers more detail:os...

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

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668 views

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java - MouseListener on JFrame

I want to be notified of mouse events (specifically the mouse entered and exited events) on my JFrame. But ... mouselistener is not the answer. See Question&Answers more detail:os...

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

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1.2k views

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java - Convert RGBA values to hex color code

I have some sliders in my application that allows the user to change ARGB colors, however I need to convert ... this to an Integer? 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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609 views

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java - How to resize Swing control which is inside SwingNode in JavaFX8?

How to resize Swing control which is inside SwingNode in JavaFX8? Sometimes, I has controls resized inside SwingNode. But ... launch(args); } } See Question&Answers more detail:os...

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

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