Recent questions tagged Java

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java - How to get the file list for a commit with JGit

I have been working on a Java based product for which the Git features are going to be integrated. Using one of ... for the commit object } } 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 convert linkedlist to array using `toArray()`?

I do not know how to convert a linked list of doubles to array. Please help me find the error. import java. ... return values.toArray(v); } } 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 - Use StringBuilder to pad String with blank spaces or other characters

I'm a beginner to java and this is my first post on Stackoverflow. Although my initial code is similar ... modify/correct my StringBuilder code. 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 - Importing CSV data with Apache POI

How can I efficiently import CSV data with Apache POI? If I have a very large CSV file that I would like to ... the best way to import...? 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 install maven on eclipse

i want to install maven plug in on eclipse. but when add the maven site in install software section, and ... a complete installation guide... 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 - Room Database force OnCreate callback

I'm developing an application with RoomDatabase that needs to pre-populate its data; I already managed to do it ... //Populate database 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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java - Should I declare/Initialize ArrayLists as Lists, ArrayLists, or ArrayLists of <Cat>

What is the difference in declaring a collection as such public class CatHerder{ private List cats; public CatHerder(){ ... <Cat>(); } } 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 - Maven: javaee-api vs jboss-javaee-6.0

I want a Java JEE6 project built with maven, and I want it standard So, I put this in my pom.xml: < ... the standard javaee-api? 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 - Calculating Manhattan Distance

I'm implementing NxN puzzels in Java 2D array int[][] state. am required to use the Manhattan heuristic in the ... I write this code in Java? 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 - Who interrupts my thread?

I understand what an InterruptedException does and why it is thrown. However in my application I get it ... Spring Log4J Mysql connector 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 setOnEditorActionListener() doesn't fire

I'm trying to set a listener to EditText when enter button will be pressed.But it didn't fire at all. I tested ... wrong? How can I fix 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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java - No suitable driver found for jdbc:postgresql://192.168.1.8:5432/NexentaSearch

I wrote following the java program import java.io.*; import java.util.*; import java.sql.Connection; import ... Help to eliminate an error. 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 Oauth2.0 Missing grant type

I am using Spring Oauth 2.O. When I pass request as a form-data it works fine, but when I try to pass ... "Missing grant type" } Please Guide. 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 - JSch 0.1.53 session.connect() throws "End of IO Stream Read"

I downloaded a new JSch 0.1.53 library and JSch (sftp) download task no longer works. This ... Authentication succeeded (keyboard-interactive). 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 - Error Handler Servlet: how to get exception cause

I have an error servlet configured in my web.xml: <error-page> <exception-type>java.lang.Exception</exception- ... throwable.getCause() is null. 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 - Configuring res srcDirs for androidTest sourceSet

I'd like to include resources to be compiled only for testing. I have the following in my app module build. ... are only included for tests? 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 - consumer.How to specify partition to read? [kafka]

I am introducing with kafka and I want to know how to specify partition when I consume messages from topic. ... partition will I read messages? 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 - Polymorphism and Static Methods

I have a question about this code right here public Car { public static void m1(){ System.out.println("a"); ... . Please clear this up, 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 display 5 digit unicode characters such as a speaker /u1f50a

The speaker icon unicode 1f50a is 5 digits from the "Miscellaneous Symbols and Pictographs" family and when I ... textSound.setText("u1f50a"); 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 - Storing a HashMap in an SQL database

How do you store a HashMap inside of an SQL database? Also, how would you load that HashMap from a SQL ... along with it's respective user. 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 - Generics Oddity - I can insert a Long value into a Map<String, String> and it compiles and doesn't fail at runtime

Give the following code: public static void main(String[] args) { HashMap<String, String> hashMap = new ... are noticing when running 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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java - JScrollPane and JList auto scroll

I've got the next code: listModel = new DefaultListModel(); listModel.addElement(dateFormat.format(new Date()) + ": ... . How can I fix 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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java - Thymeleaf Map Form Binding

db.html <div th:each="pr, stat: *{mergeMap}"> <tr> <td><input type="text" name="key" th:value="${pr.key}" ... " value="Submit" /></td> </tr> 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 - Can Maven generate the module declaration?

The module declaration defines, among other things, a module's dependencies. If I use Maven as a build tool, this ... module-info.java for me? 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 - Object.hashCode() algorithm

I'm looking for the algorithm of Object.hashCode(). This code is native in Object.java. Is this because ( ... 's memory address in hexadecimal." 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 optimize solr index

How to optimize solr index. I want to optimize my solr indexing for i try to change in solrconfig.xml it ... are involve in index optimization. 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 - Keyboard not appearing in floating window

I'm writing an application that uses the following code to draw an edittext on the screen over running applications: ... ideas? I'm stumped :( 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 - Why not allow an external interface to provide hashCode/equals for a HashMap?

With a TreeMap it's trivial to provide a custom Comparator, thus overriding the semantics provided by Comparable ... not belong in HashMap). See Question&Answers more detail:os...

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

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