Java
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Java observer and observable do not work properly between applications
I have an application that contains the main JFrame of the default list model I hope that if I modify the contents of …… -
Java – bad operand type of binary operator ‘^’
Try to create a recursive method to promote a double value to the int permission of the java course The instruction sa…… -
Java – accessing property files in spring expression language
I created a simple web application using spring boot with thymeleaf I use application Properties file as configuration…… -
Java – create new instances of classes or allocate only space in memory?
UPDATE public Fish mate(Fish other){ if (this.health > 0 && other.health > 0 && this.closeEnou…… -
Java – LinearLayout: align with the right of the parent object
Consider the following XML <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas…… -
Java – what’s wrong with this clone()?
I have written this cloning method when the parent class of the Employee class is abstract and the clone () method in …… -
Java gets the first two decimal digits of a double
I have a huge double, and I want to get the first two decimal numbers as floating point numbers Here is an example: do…… -
Java – JSTL for each in JSF 2
Hi, I got the following code: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTM…… -
Java – given a list of IP addresses, how do you find min, max?
In Java, I have an ArrayList of IP addresses How do I find the minimum and maximum values? I have used collection Min …… -
Java – do you have to know the machine architecture for writing code?
Suppose I use Java or Python or C programming to solve a simple problem, which may be to build a TCP / UDP loopback se…… -
What are some prominent real-world applications of Java?
I am a beginner programmer. The I & CS course in our school let us start learning Java In my opinion, C and its se…… -
Java – how to prevent hibernate from refreshing in the list?
I have a simple hibernate query, such as: from MyEntity where name = ? It's not fancy, but it's called many times in a…… -
Java: what is the difference between format specifiers% X and% H?
Looking at the specification page, I see that% h calls integer Tohexstring(), but I can't find any actual difference b…… -
Java – swing text editor, color and highlight
I am writing an application that users need to write a JavaScript script as input. Now I have a simple jtextarea, but …… -
Tricky Java programs
Look at the following code, please help me solve this problem class TestTrick{ public static void main(String arg…… -
Java – print the inversion of any string without using any predefined functions?
How to print the reverse of string Java is an object-oriented language without using any predefined functions, such as…… -
Java – mockito: how to test that a constructor is called?
I'm using mockito to test methods in Java applications How to test that the constructor is called once? I'm trying a s…… -
Java – how to read an integer separated by spaces into an array
There's a problem with my project because I can't get the correct start, reading integer rows separated by user spaces…… -
Java: I have a large string of HTML and need to extract href = “…” text
I have this string that contains a chunk of HTML. I try to extract the link from the href = "..." part of the string H…… -
Java JTable does not display gridlines
I showed a JTable. In JPanel JTable is located in a scrolling window table.setShowGrid(true); Here is a picture: note …… -
java – vert. How is x single threaded?
According to my understanding, every vert X instances will be assigned an event loop Event loops handle all requests a…… -
Does every program in Java need a class?
Is this always the case? Solution Yes, you need at least one class to have a program, but no, you don't need any metho…… -
java – kryo. ReadObject causes NullPointerException with ArrayList
When I use kryo to deserialize the ArrayList object, I get a NullPointerException Caused by: java.lang.NullPointerExce…… -
Java – what features does EJB3 bring and how does EJB3 integrate with the spring framework?
I have never been involved in EJB work. When I started programming spring, it was already here. All my projects only u…… -
Java – conditionally skip TestNG tests
I don't have much experience with TestNG annotations, but I'm trying to build a test suite using the TestNG framework …… -
When to use flush () in Java?
import java.io. * ; import java.io. * ; public class Ser { public static void main(String args[]) { try …… -
Is there a correct way to check the existence of files / directories in Java?
Code: String dir = //Path to the directory File saveDir = new File(dir); //Here comes the existence check if(!saveDir…… -
Java swing – JList custom cell rendering – capture operation
Whenever I create a custom cell renderer for JList, any elements I add to it will not respond to the operation For exa…… -
Java – when I need to escape an HTML string?
In my legacy project, I can see that escape html is used before sending strings to the browser StringEscapeUtils.escap…… -
Java – how to delete objects from the stream in the foreach method?
I have to use arrays: arra and ARRB Arra and ARRB are lists of different types of objects. The add function converts o…… -
How to read comma separated values from text files in Java?
I have this text file, which contains the latitude and longitude values of different points on the map How do I divide…… -
Can I write variable names with hyphens in Java?
I use gson in my application I have the following JSON responses: { "success":true,"person-name": "John" } So I'm cr……