Recent questions tagged java

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java - Delete all files in directory (but not directory) - one liner solution

I want to delete all files inside ABC directory. When I tried with FileUtils.deleteDirectory(new File("C:/ ... directory but not directory? 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 - Tomcat in Intellij Idea Community Edition

Is it possible to run a web application using Tomcat Server in Intellij Idea Community Edition? I tried to find ... haven't achived any success. 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 - What is the recommended project structure for spring boot rest projects?

I'm a beginner with spring boot. I'm involved in the beginning of a project where we would build rest ... that will just expose rest services? 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 - Difference between solr and lucene

I know that Lucene and Solr are 2 differents Apache projects that are made to work together, but I don't ... this a totally different approach? 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 - How does the singleton Bean serve the concurrent request?

I have a question regarding how singleton beans serve concurrent requests in detail. I have searched on ... with a singleton instance? 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 - Convert Long into Integer

How to convert a Long value into an Integer value in Java? 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 - What is Persistence Context?

I am new to the Java world and JPA. I was studying JPA and came across many new terms like Entity, ... there is a unique entity instance. 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 - How do I implement a DAO manager using JDBC and connection pools?

My problem is as follows. I need a class that works as a single point to a database connection in a web ... pooling! What should I do? 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 is synchronized block better than synchronized method?

I have started learning synchronization in threading. Synchronized method: public class Counter { private static int ... synchronized method ? 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 do we use a DataSource instead of a DriverManager?

I am reading the Java JDBC specification (vr. 4) and I encountred this statement: DataSource - this interface ... instead of a connection? 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 - Eclipse copy/paste entire line keyboard shortcut

Anyone know the keyboard shortcut to copy/paste a line into a new line in Eclipse, without having to highlight ... in the windows->preferences. 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 - Android MVVM Design Pattern Examples

I currently do a lot of WPF development and have started creating some basic Android apps. When creating WPF ... MVVM for the Android platform? 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 - How to specify maven's distributionManagement organisation wide?

I'm trying to figure out how to organize many (around 50+) maven2 projects, so that they can deploy into ... simpler solution to the problem ? 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 - What's the difference between JPA and Spring Data JPA?

I am a bit confused about the difference between Spring Data-JPA and JPA. I know about JPA that it is a ... or only using 'Hibernate' directing? 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 - What are the big improvements between guava and apache equivalent libraries?

We currently use apache collections, string utils, etc. I need to decide if we should switch from the ... significantly easier with guava. 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 - How are "mvn clean package" and "mvn clean install" different?

What exactly are the differences between mvn clean package and mvn clean install? When I run both of these commands, ... to 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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java - What is the best way to do GUIs in Clojure?

What is the best way to do GUIs in Clojure? Is there an example of some functional Swing or SWT wrapper ... using some macrology? Any tutorials? 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 - Convert Set to List without creating new List

I am using this code to convert a Set to a List: Map<String, List<String>> mainMap = new HashMap<>(); ... of the loop. Is that possible? 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 - Eclipse: Set maximum line length for auto formatting?

I am working with Java. If I hit Ctrl+Shift+F in Eclipse Helios, it will auto format my code. At a certain ... line length. How can I do this? 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 - Need to store a 2d list but not using array

Consider that I have a txt file containing data of the following format: "Home" "A1" "Car" "A2" "Home" "B1" ... an example as I am new to Java. 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 - How to use get getApplicationContext() in Adapter Class

I am using Firebase to populate my BlogRecycleadapter with blog post and get Likes from Like Buttons but when ... isConnectedOrConnecting(); } } See Question&Answers more detail:os...

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

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200 views

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java - How to get particular html table contents to write it in pdf using itext

I have used iText to export the table contents to pdf. Here is my code: JSP: <%@ page language="java" ... instead of actual values. Any help? 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 is this not casting to long

I got strange java casting problem today coming from such code new Date(System.currentTimeMillis() - 1000 * 60 * ... constants to be int ? See Question&Answers more detail:os...

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

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338 views

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java - Automation Testing Error : org.openqa.selenium.WebDriverException: disconnected: unable to connect to renderer

I am new in automation testing and I am facing the following error. I am not able to proceed ... FirstTestClass.main(FirstTestClass.java:19) 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 - String concatenation and comparison gives unexpected result in println statement

I couldn't figure out the following behaviour, String str1= "abc"; String str2 = "abc"; System.out.println(" ... str1==str2 true str1==str2 true 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 - Accessing the ExecutionContext values in HeaderCallBack in Spring Batch

I'm trying to write a spring batch job which reads data from database and writes to FlatFile. I need to ... out the issue would be helpful. 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 - JavaFX: Add UI control to TreeTableView

Let's say i have 2 columns in a TreeTableView and now i want to add a string/Label in the first column ... this? Really appreciate any help! 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 - Dispose JFrame from another class

How can I dispose JFrame from another class? My code is listed below. I use Netbeans generate form for ... End of variables declaration } See Question&Answers more detail:os...

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

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