Java
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Multithreading – pthreads – how to parallelize jobs
I need to parallelize a simple password cracking program to use it on N processor systems My idea is to create n threa…… -
Java – calendar #getfirstdayofweek() returns an incorrect value
I may ignore some incredibly obvious things, but why final Calendar calendar = Calendar.getInstance(Locale.GERMAN); Sy…… -
Java – object reference types in Ruby
I am a novice in ruby and am currently trying to use some examples in the ruby book as a guide: class Account attr_acc…… -
java-ee – ColdFusion web. xml？
For deployment descriptors in J2EE Web containers / Web XML file, does ColdFusion simulation exist? I know that CF run…… -
Java transient key word method sugar?
Why not resolve transients by using annotations instead of introducing keywords? It seems that the transient keyword d…… -
Java – map filter lambda expression using two fields from different class hierarchy routes
We have a method that receives class objects at the top of the class hierarchy It uses a condition based on a field de…… -
Java – how to determine the controller (spring) for a given URL
How to use spring defaultannotationhandlermapping to find the controller that will eventually process the given URL I …… -
Java – Android: firebase search query does not work properly
I'm new to Android application development I created a simple search query to search my firebase database by name (see…… -
Java enum valueof has two parameters?
Why does valueof have two parameters? In Java documentation for valueof But most of the examples I see online say: enu…… -
Java – how to use the two objects of the most special type as the return type?
What I basically want is to infer a more professional type, as shown in the following example: Predicate<Object>…… -
Java swing How to wait for other jframes
In JFrame, when I click "login", I pop up another JFrame, namely login window How can I make my main JFrame wait for m…… -
Java – how does a servlet work?
I've written several servlet programs, but I don't think I fully understand how servlets work So this is a husband and…… -
A module error occurred while running the JavaFX media application
When I run a JavaFX 11 application with the following command: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -p ~/.m2/r…… -
Java – is there any practical reasoning to force the build of the JDK version?
There is a maven enforcer plugin that can force the build to run only on a specific JDK version I wonder if there is a…… -
Array – it is faster for PowerShell ArrayList Add or = operator?
I found that if you create an array in the power shell and do this: $myArray = @() $myArray += 7 Each time this statem…… -
. Net – ORM example using a single table instead of a single table for the entire hierarchy?
From http://blogs.tedneward.com/2006/06/26/The +Vietnam+Of+Computer+Science. Aspx start "Developers usually take one o…… -
Java – unit test edge cases using JUnit
I have a utility class called stringprocessor In the breaklongwords () method, zero width spaces will be added to the …… -
Java – decimalformat() and problems with Russian computers
I have a BigDecimal, and I convert it to string to make some modifications DecimalFormat decimalFormat = new DecimalFo…… -
Java – kotlin stream Peek (…) method
Java. In kotlin util. stream. Stream<> . What is the best choice for Peek (...)? https://docs.oracle.com/javase/…… -
Java – convert 2 decimal to integer
I want to convert the number 2.55 to 255.55 in Java I tried the following code, but I got 254 instead of 255: final Do…… -
Java – simulate / test core objects in my system
I was asked to change some classes that are core to the system we work on Each problematic class needs 5-10 different …… -
BlackBerry – use MIDlet Platformrequest() opens the file
Can I use MIDlet Does the platformRequest (string URL) method let the device open the file on disk? I want to use the …… -
Why not pass every method in Java and throw an exception when passing a function type parameter instead of a consumer?
See English answers > Why do consumers accept Lambdas with statement bodies but not expression bodies? 3 This is my…… -
How do I test null keys on any Java map implementation?
I want to make sure that the map passed to the method as a parameter does not contain a null key People will think tha…… -
When creating Java objects that will be referenced frequently at multiple levels, is it better to use class instances or make classes static?
I'm writing a java game. I need a master database of the unit prototype Database is just a class containing HashMap, w…… -
Bouncing ball in Java
This may be a very basic question, but I can't seem to find any other articles Anyway, I wrote a little bouncing ball …… -
Java – shared variables without synchronization
I read from Java concurrency in practice that it is not good to share variables in threads without synchronization How…… -
Java servlet pool
Servlets 101 under Tomcat 6: Someone can give me a good explanation of the best way, for example Create a collection o…… -
How does Java make windows?
How does the JVM make its window? I know it has jar files and executable files Is it a graphics library standard insta…… -
Java – Lombok annotation cannot be ignored – sonarqube
When I used the code coverage tool "sonarqube", I tried to ignore Lombok comments in my java project. I studied a lot …… -
Java – implement the project version page in JSF
I am creating a JSF application I have some projects from the database (such as products). I want to create a JSF page…… -
Java – spring MVC – JSP cannot be rendered
I just started trying to create a new project using spring MVC, and I encountered a problem. There is no manual or tut……