Java
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Java – simpledateformat cannot resolve date
I have encountered some problems parsing string so far I searched for an idea on stackoverflow, and I got my answer, b…… -
Java – performance comparison test between threadlocalrandom and shared static random instances
In our project for a task, we use static random instances to generate random numbers After the release of Java 7, a ne…… -
Java – when to use uppercase and lowercase names
I'm a novice in Java. I just started learning this language, but I encountered some obstacles along the way. I hope yo…… -
Java – mybatis custom typehandler is not executed when tags are placed
I have a < resultmap > that uses a custom typehandler as one of the result properties: <resultMap id="foo" ty…… -
Java – how to pass multiple parameters to a restful web service using HTTP post
I have two array parameters and an object array, and I want to pass them @POST @Path("Test3") @Produces("text/plain"…… -
Java – running functions on JButton
I'm trying to create a program in Java that uses a robot to press a specific key every few seconds It has a GUI with s…… -
Java – is it correct to use ArrayList or LinkedList instead of list when declaring variables / parameters?
See English answers > type list vs type ArrayList in Java 15 public class foo { private List<String> fooT…… -
Multithreading – passing qlist * to signals from qthread
In my QT application, I have a class called from an object running in a thread In my worker class, I created qlist, ju…… -
Java – object initialization using interfacetype
I've just come into contact with the Java programming language I have been programming in c# for two years When I brow…… -
Java – JScrollPane ‘lazy’ scrolling, containing many components
I have a 3045 form! Components (1015 labels, 1015 text fields, 1015 combo boxes) All of these are in JPanel and JPanel…… -
Java – binary search is not applicable to doubles
This program applies to integers, but not doubles There was no error, but the program returned - 1 Sorry, if this is a…… -
Java – data structure with key value mapping and sorting
I need a data structure that provides key value mapping, such as map, but this also allows me to obtain keys based on …… -
Java – directional path in neo4j
I am faced with a seemingly simple problem I want to use the Java API to traverse the nodes of the neo4j graph However…… -
Java – can I set getaddrinfo timeout for defaulthttpclient in Android?
In the Android application, I try to test whether the user has an available Internet connection If you are interested,…… -
How to resize button text – swing in Java
I'm new here and have taken my first step in Java For learning purposes, I'm trying to create a simple GUI using a gri…… -
Java running program at command prompt: main class not found or loaded
I'm trying to learn how to compile and run using only the command line in windows This is the directory tree from the …… -
What’s wrong with defining a Java class with an array of elements of that class as one of its fields?
My application model is composed of disorders, each of which has innate attributes (identity, name, incidence rate, et…… -
Togglegroup using togglebuttons JavaFX
How to deselect all togglebuttons in the togglegroup in JavaFX? There seems to be no clearselection () function like t…… -
Java – bean validation: how to manually create a constraintviolation?
I have a specific scenario where I can only manually check violations later in the process What I want to do is throw …… -
Java – is delayed initialization using immutable data always thread safe?
I have two classes a and B: class A { private final String someData; private B b; public String getSomeDa…… -
Java – why are the best practices for static classes different in OOP?
I'm currently reading about Java best practices. I find that according to this book, we must support non static static…… -
Java – a better way to implement an empty while loop to maintain control
I'm playing the background audio. I want the control of the program to remain stationary until the audio playback is o…… -
Java – StringBuffer class and Chinese character encoding
I wrote a method to return a string containing Chinese characters public printChineseMenu(){ StringBuffer buffer; …… -
Java – hibernate does not create tables – spring MVC
I have a spring project and I'm using hibernation When I started the project, DB didn't change I tried the difrenf con…… -
Java – why does the swagger annotation generate API docs with a default path prefix
I use the Maven plug-in below to integrate swagger with my application I configured the following in my spring servlet…… -
Java – use regexp to extract values between parentheses
Before management, I try to extract the value between parentheses (and) to check the existence of the value Please hel…… -
Java – Eclipse Plug-in: run the code immediately after startup
I want to display a message immediately after the plug-in starts If I put my code in activator At the end of the start…… -
Why does this multithreaded Python program print correctly from 0 to 99?
This is the code from Queue import Queue from threading import * threadLock = Lock() def do_stuff(q): while True: …… -
Java regular expression: if the closing bracket is the last character in the string, match any number of digits in the parentheses
I need some help to save my day (or my night) I want to match: >Any number of numbers > enclosed in parentheses …… -
Java – Android slidinguppanellayout up slide event
I'm using https://github.com/umano/AndroidSlidingUpPanel. It works well, but I'm trying to find some ways to listen fo…… -
How to use the same add () method in two different classes
Is there any way you can use the same add () method between two different classes (add content to the array)? For exam…… -
Java – using action tabs and WebView
I want to have my application to display tabs at the top of the screen (make it work) and set up WebView. XML in the X……