Java
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Java initialization variable increment
Is it risky to initialize a global variable in increments of another global variable? Example: int a=0; int b=a++; i…… -
Implement within the interface – Java
We know that we cannot implement functions in interfaces in Java I just tried public interface InvoiceService { publi…… -
Java – retrieves values from nested JSON arrays in mongodb
My Mongo collection has entries in the following format { "myobj" : { "objList" : [ { "locatio…… -
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 gives the wrong answer in computing
I want to do some calculations in Java, I know it's not so bad to do something in more steps, but why use additional t…… -
Multithreading – when using a method in a thread, “the type does not meet the required lifecycle”
I tried to use a method in a thread in rust, but I received the following error message Here is the sample code: use s…… -
Java – setlocation in jlabel
My task is to get the position of the mouse when I click, except for one thing: the position of the output I should ge…… -
Java – connect to AEM 6.0 JCR: precondition failed
I encountered some problems connecting to the JCR repository in AEM 6.0 When I reach the point about creating a sessio…… -
Java – static and non static overloads to each other
Are these two functions overloaded class yogi{ public static void fun(){ System.out.println("Fun"); } …… -
Java – generics and inheritance?
See English answers > java: can't to generic list mylist 4 public static void main(String... args) { List<C…… -
Creating named pipes in Java
I'm trying to create named pipes in Java I'm using Linux However, I encountered a problem writing to the pipeline File…… -
Reducing objects to maps using java 8 streams
If I had a similar course public class Property { private String id; private String key; private String va…… -
Java – first item name of JTable jcombobox error
I added a swing to a JTable JCombo@R_695_2419 @, but the tag of my first project was always javax swing. JCombo@R_695_…… -
Java – rise from preferencearag and preferencefragments using optionsitemselected
I'm having trouble using optionsitemselected when using Android studio's default set activity (extended appcompatprefe…… -
Java – try to draw a circle in libgdx
It's very basic, but I can't figure out what's wrong Basically, I want to draw a circle around an area of one of my ob…… -
How does this java code instantiate an abstract class?
I'm changing our Java class, and I notice the following line of code: OurClass<OurInterface1> ourClass = new Our…… -
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 – 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 – call mainactivity method (extend broadcast receiver) from other classes
I'm trying to call mainactivity's method display from another class (phonestatereceiver)_ notification. But got this e…… -
Java – slow initialization of large and small objects
I came across this case today. I want to know the reason behind this huge difference The first version initializes a 5…… -
How do java – lambda expressions work with predicate?
I need more explanation about lambda expressions‘ How does' p 'mean list < person >? Can you explain clearly? Li…… -
Java SWT makes label scrollable possible
I have a label in a group in SWT. If it contains many lines of text, I want it to scroll vertically Use SWT V_ It does…… -
Cannot instantiate a value of type java.util.linkedhashmap from a string value (‘{‘); there is no single string constructor / factory method
I have the following two classes: @JsonIgnoreProperties(ignoreUnkNown = true) public class ChangesJSON { @JsonPro…… -
Java – synchronized vs readwritelock performance
I try to prove that synchronized slows down when there are many readers and only a few authors Somehow, I proved the o…… -
Alternatives to Java applets
I'm going to write a simple program to graphically display my college students' course prerequisites (i.e. networks as…… -
Java – implement equals and hashcode for BST
This problem is a follow-up problem of implementing hashcode for a BST My question was hard to think of, so I got an a…… -
JavaFX – how to focus on one phase
My application has a main application stage from which a second window can be opened I just want to focus on one stage…… -
Java – how to unit test and simulate methods with files as parameters
I have a collectionobject class to create an ArrayList public class CollectionObject { private List<String>…… -
Java – how to determine whether the JRE is 32 / 64 bit from the folder structure / file
I have a JRE folder on windows Is there any way to determine whether the JRE is 32-bit or 64 bit by looking at the int…… -
JavaFX: null tableview message
I am developing a java project using eclipse, JavaFX and tableview My application has three languages to choose from. …… -
Is java – volatile propagated to instance members?
Suppose you have some simple container declarations and instantiate them like this class Test { private volatile L…… -
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……