Recent Posts
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Java – how do I ignore spaces in substrings?
I have a text box that makes suggestions based on user input. One of my text boxes is location - based The problem is …… -
JavaFX filteredlist, which filters based on the properties of the items in the list
I have a case where I need to filter an observablelist < item > based on some attributes of the item (that is, t…… -
Java – allure: the environment files in the target folder are deleted on Maven clean How do I generate it at each build?
Description indicates that the environment XML is added to the allure results directory（ https://github.com/allure-fr…… -
Java – the difference between using the exception class or FileNotFoundException class to catch exceptions
Just like I have these two scenarios, we must deal with FileNotFoundException Case 1: try { FileInputStream fi…… -
Java – why can’t the final static variable be assigned in the instance block?
class Test { class Test { static final String name; { name = "User"; /* shows error. As …… -
Java – how to get the number of characters in jtextarea?
I have a jtextarea. I need to convert the character of each field to another character So I thought of a simple cycle:…… -
Java – invalid from phone number with us number
I am a novice of twilio and try to send text messages using Java API As I saw in other sof posts, I posted my first lo…… -
Symfony – @ uniqueconstraint and @ column (unique = true) options differ at the doctrine ORM level
At the database level, there is no difference in defining uniqueness with one option instead of another, as shown belo…… -
Java – hibernate / spring – rollback transaction in transaction
In view of this example code: public class MyServiceImpl implements MyService { @Transactional public void myT…… -
Java – get localdatetime from seconds, including time zone
I have time from our computer "day 0" (at midnight on January 1, 1970) in a few seconds. I want to convert it to a loc…… -
Java – how do I detect the number of fingers in use?
I'm playing a game with libgdx. I need to know if the user is using two fingers and placing them in the right position…… -
Java – array index exceeds binding error when splitting string
Someone can help me find the following code problem: it always gives me one: code Solution . Is a special character in…… -
Java – randomly divide a given number m into N parts
Therefore, the idea I have is to be able to divide $2.00 into 10 people, and each person will receive a random amount …… -
Multithreading – JavaFX task Updatevalue triggers only the first change event
I want to observe the valueproperty of a task and take action when updatevalue () changes The change event seems to be…… -
Java uses “extend” and range resolution / point operators?
I have encountered this problem while reading some code, and I have no idea what it means I tried to use Google search…… -
Java – in which layer do I access the database in the MVC design
I have a question about database access in MVC applications Where should I put my database access logic? Should it be …… -
Java – how do I display an input dialog box with a drop-down list with icons for each item?
I use this java code in my swing application to display an input dialog box with a drop-down selection list so that us…… -
Is java – volatile propagated to instance members?
Suppose you have some simple container declarations and instantiate them like this class Test { private volatile L…… -
Java – polymorphism, ArrayList and objects
This is a common problem I try to understand the concept of polymorphism when creating a valid program or at least one…… -
Java – retrieves values from nested JSON arrays in mongodb
My Mongo collection has entries in the following format { "myobj" : { "objList" : [ { "locatio…… -
Java swing gridbaglayout – add a button without spaces
How to delete the spacing caused by gridbaglayout and make them stick together? import java.awt.BorderLayout; import j…… -
Java – why does the @ requestmapping spring annotation in the controller capture more of what I want?
I have a simple spring controller and mapping: @Controller public class HomeController { @RequestMapping(value = "/hom…… -
What is a good use case for Java beans?
I just saw the Java beans specification I think using only getters, setters and empty constructors will make the code …… -
Multithreading – parallel execution of computationally expensive mappings
I'm new to the reactivex Library (I use its Scala variant, RX Scala) I have an observable that sends values at a high …… -
Get the first and last time (in milliseconds) using the Java 8 time API
I converted my time calculation from self implemented code to Java 8 time API I need from Java time. Year or Java time…… -
Can Java string literals be garbage collected? If so, how to prove it?
Can Java string literals like "ABC" be garbage collected? If so, how can we programmatically prove that they are GCed?…… -
Java – handle leap seconds correctly
Before and during leap seconds, it seems that calling new date() will return 23:59:59 twice (once before leap seconds …… -
Fill HUD with Java
I decided to use the above image to make HUD, but I don't know what command to use in Java, because I can fill the upp…… -
How to convert javax xml. datatype. Duration
I have javax from the server xml. datatype. Response in duration format thank you. Solution A simple and direct soluti…… -
Java – the way to invoke Android services in different threads. Is it still running on the main thread?
If I understand correctly, by default, Android services run on the main UI thread However, my problem is that if Servi…… -
Using multiple array constructors in Java
There was a problem creating a constructor with multiple one-dimensional string arrays: class relation { String[] set…… -
How do I automatically start rserve from Java?
I write Java applications in the IntelliJ ide The application uses the rserve package to connect to R and perform some……