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      Questions tagged [java]

      Java is a popular high-level programming language. Use this tag when you're having problems using or understanding the language itself. This tag is rarely used alone and is most often used in conjunction with [spring], [spring-boot], [jakarta-ee], [android], [javafx], [hadoop], [gradle] and [maven].

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      Unable to connect and get postgres data from cron scheduler job

      I am looking for automatic postgres database connection when job is triggered. I am unable to connect to postgres database and get the booklist. I tried to call a postgres database table called ...
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      Break it down like Barney. What does : and ? mean [duplicate]

      I am a noob in Java; I need someone to explain the code below. Nothing is broken I just can't get a clear understanding. Specifically, the question mark (?) and the colon (:). What do they mean, and ...
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      “org.springframework.cloud.gateway.support.DefaultServerRequest” is deprecated, any alternative?

      I am using sonar detection code, it point ""org.springframework.cloud.gateway.support.DefaultServerRequest" is deprecated, Does anyone know what can be replaced.
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      Filtering data in a table - how to organize it correctly

      I study the spring+Hibernate bundle there Is an entity: public class PersonEntity { private Long id; private String name; private Integer age; private City city; private ...
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      how to call setters and getters in java from one class to another into a main method

      How do I call a setter/getter into my main method from another class? Get it from this - enter image description here to this - enter image description here
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      17 views

      Why can't I modify a variable in Java?

      I don't know why can't I modify a variable in Java, take my code This is my code: public class Main{ public static void main(String[] args){ int number = 1; change(number); ...
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      10 views

      Problems with UTF-8 encoding - web-project

      I'm aware that this question was already asked a couple of times, but I didn't get the problem solved even with the hints mentioned in other posts. For a small webproject I created some html/jsp pages ...
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      11 views

      How to call main class in Netbeans Java

      Sir, this is my first post in this forum. I am using Netbeans 12 and trying to create java maven project. I have this main class package com.mycompany.crud; import java.sql.*; import javax.swing.*; ...
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      Can't use JFoenix on JavaFX maven using Apache NetBeans

      I install the dependency, I build it, clean build it and build with dependencies yet I got this error, and I don't know what cause the error. I am new to javaFX maven and I want to expand my knowledge ...
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      Which route should I take as beginner to Java

      I have done some basic HTML, basic CSS, and I have done python. I'm not sure on what steps should I should take as a beginner to Java.
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      How to use Listview inside child layout of Expandablelistview in Android Studio

      I want to take Listview inside child layout of ExpandableListview, the child layout will fetch data from a JSON File. I am providing my necessary code for checking you. Can you please help me how I ...
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      10 views

      Can we use AIDL file in flutter?

      I have used Android Interface Definition Language (AIDL) file in native android , now i have to use it in flutter. is it possible to use AIDL file in flutter. If yes how? i could not find any examples ...
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      20 views

      Java DB Connection using JDBC

      I have a question regarding database connection I am using the Apache Derby database When I trying to connect to my database using DriverManager I am having an error private final String DATABASE_URL ...
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      16 views

      How does ConcurrentHashMap work in Java regarding many different users from across the world?

      I am still learning about how concurrency works in large scale applications and I was hoping someone could clear up some questions I had: If I put a ConcurrentHashMap in a java class that is hit ...
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      12 views

      Parsing HTML date input into Timestamp in Java Servlet

      Recently I'm having a problem with Timestamp and HTML input type Date: This is my HTML/JSP: <div class="form-group"> <label>Your day of birth</label> <input class=&...

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