I have a 2d array in Java 8: String data[][] = new String[i][2]; And it looks like this: Player1 8 Player5 3 Player3 9 Player4 5 … and I want to sort it to have the highest score at the top: Player3 9 Player1 8 Player4 5 Player5 3 How can I sort this or is there a better way
java swing nullpointer exeption whilst adding buttons [duplicate]
This question already has answers here: What is a NullPointerException, and how do I fix it? (12 answers) Closed 8 months ago. solution So i was trying to do a java-swing-gui for a school project and therefor I have to add 72 Buttons (idk) to a JPanel element. I tried using a for-loop: but it didnt really wor…
Can you still use a ConcurrentLinkedHashMap with Caffeine?
Caffeine provides a great alternative to Guava’s caching library, but can you still use just the ConcurrentLinkedHashMap class itself, or a Cache the implements concurrent, in-order iteration? It does not appear in Caffeine anymore that I can see, although I’m sure its using something similar unde…
How to read http headers synchronously using BufferedReader?
My problem is that BufferedReader#read() creates an infinite delay until the connection is terminated. As soon as it is interrupted, immediately BufferedReader produces the result. So, because of these delays, I cannot read the headers in sync with the page load. Answer BufferedReader is not the solution, as …
Springboot/Thymeleaf – How to execute a different SQL query based on the URL?
I would like to be able to display different data based on the previous category that was selected. For example, I currently have categories, that once clicked should redirect a user to a new page that displays all the relevant information for that category. The url should look something like localhost:8080/c…
Double-ended queue – mask integer
I’m having a hard time understanding what the mask integer is for (2nd line). I get that it regulates where values are placed in a double-ended queue, but I don’t get how exactly. This is part of the code from a double-ended queue just to have some context. Answer mask is used to wrap around the h…
quarkus @ObservesAsync invoke Uni
What’s the best way to invoke Uni in an async observer? It would be great if I could just return Uni but unfortunately that doesn’t work. Answer As mentioned by @ladicek, you can: use a synchronous observer and block until termination use a synchronous observer and “trigger” the async …
Handle an exception in another method without losing the request objects from original one
There is an Exception that is thrown when an user is not found in database and i’d like to handle that particular exception from the controller perspective layer in a separated method by @ExceptionHandler annotation without losing the original data sent by the user. Well, so, i’m using Sessions an…
Try/Catch isn’t catching my null Image exception from URL in JavaFX
Okay so, I have a Circle component which I assigned in SceneBuilder. I want to fill this Circle with an ImagePattern object, however I’m running into a weird problem. I’m assigning a lot of images from lots of URL’s in a database and they’re only set when I click them, and some of the …
Garbage collector vs IOC
Today I attend the interview I am a newbie to java, spring boot. The interviewer asked the question about garbage collectors. I said the garbage collector will release the unused resource. Then he asked about the IOC container, I said it take control of object creation and will inject into the dependent bean.…