Java
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Java – mouselistener / keylistener does not work (JPanel)
I'm working on a small project involving the mouse and key listeners in JPanel Unfortunately, when I use the mouse / k…… -
Java – set the size to TreeSet
Is there any way to provide size limits for treesets in Java collections, just as we do for arrays? anArray = new int[…… -
Another Java generic “incompatible type” compilation error
I was writing some code and encountered incompatible type compilation errors public interface Expression<T> { …… -
Java – BigDecimal number format
BigDecimal val = BigDecimal.valueOf(0.20); BigDecimal val = BigDecimal.valueOf(0.20); System.out.println(a); I want to…… -
Java – http / 1.1 400 error request on httpget with basic authentication
I made an application for httpget My application uses its own certificate, so the server requires user login For certi…… -
Java – how do I rename a file to another file system?
I encountered a strange problem when using renameto() I don't know why I can't rename it / MNT / desttest, but I can r…… -
Java – what is operator overloading, which is different from polymorphism?
I program in Java and have been trying to understand exactly what operator overloading is I'm still a little confused …… -
Java – finds the second smallest integer in the array
In our assignment, we need to recursively find the second smallest integer in an array However, in order to better und…… -
Java – change the application name in Android studio
This guy is a problem with Android studio I make a startup screen in manifest, and then I run the application in the s…… -
Java – how to use JSON simple to parse from JSON to map and preserve the key order
I'm using JSON simple and JSON simple lib to write configuration files, but I'm having trouble converting JSON strings…… -
Using parameterized (generic) Java classes and normal classes
If I need to write a class that handles' comparable 'data, I can do it in two ways: 1) public class MyClass<T exten…… -
Jsoup – search for elements by attribute value
So I'm not sure if this is feasible But I want to scan the XML document to find all elements with specific attribute v…… -
Java robot class – add focus to a specific running application?
I just want to find out if / how to let the Java robot class change the focus from a running Java application to a spe…… -
Java – the difference between declaring ArrayList under polymorphic and normal conditions?
What is the difference between declaring an ArrayList in such a polymorphism: List<Integer> iL = new ArrayList&l…… -
Java tags? Outer, middle, inner
Please don't worry about loops, but my question is about those keywords: external, intermediate and internal They are …… -
Java – iterative execution command list – which mode?
I wrote a java program that reads a file containing the commands to be executed (in my own language) Command is read a…… -
Java attempts to mutate in notifications
I have two tables and a module they all look at Basic – they should all update the module and update from it Is there …… -
Java – HTTP status – no resource exception found in 404 JSP
See English answers > JSP in / WEB-INF returns "HTTP status 404 the requested resource is not available" Index jsp…… -
Java – try to create a method to check whether the array contains only 1 or 4
static boolean checkNum(int[] array) { static boolean checkNum(int[] array) { boolean bool = true; for (int …… -
Java – using collections Sort()
I have to write a method to sort integers and doubles public ArrayList<Number> sortDescending(ArrayList<Numbe…… -
Java – Android: what is the best HTTP library for uploading images to the server?
There are many libraries available, but which is better for image upload? I've tried volleying before, but it's not go…… -
How to make a JavaFX image clipping application
I'm building an application for my colleagues to crop images Solution You have too many questions to be answered on st…… -
What is the main framework / library of Java AOP?
I know AspectJ, spring and JBoss Are there any other mature and widely adopted frameworks? Solution Google's popular d…… -
How to do without system Exit Java program without exit? (from user input?)
This is my code I don't know how to exit the program with the return value Any ideas? This is the last step of my task…… -
Java – org / codehaus / plexus / archiver / jar / jararchiver (unsupported major.minor version 49.0) – Maven build error
All in the afternoon, I received the above error while trying to build the project I'm sure this is related to the lat…… -
Java – cq5 – sling CurrentPage in model class
In CQ JSP, just call CurrentPage Getpath () can easily access the CurrentPage object But I'm trying to delete any scri…… -
Java constructors cannot use varargs
I have the following enumeration, which contains many constructors: public enum Route { HOMEPAGE("",null,UserType.G…… -
Java – bitstamp {“error”: “API key not found”} code response: 200
I tried to send a balance request to bitstamp in Java. I wrote the following code, but I received this error: {"error"…… -
We have a Java correspondent Net “mustinherit” or “not inheritable”?
How do we declare that a class in Java must inherit rather than instantiate directly from itself, or conversely, how d…… -
java. lang.ClassNotFoundException：org. apache. struts. action. ActionServlet
I got a Tomcat error: Sep 09,2012 3:27:48 PM org.apache.catalina.core.AprLifecycleListener init Information: The APR b…… -
How to convert Java long to * unsigned * base-x string (and return)?
[editor] I don't accept any answers involving BigInteger or other similar inefficient methods Please read the question……