I have been trying to implement the given formula in JAVA but i was unsuccessful. Can someone help me find what I am doing wrong? Do i need to shift the summation index and if so how? My code: Answer Just trying to collect all my comments under the question into one coherent answer, since there are quite a fe…
Tag: java
MenuItem and toolbar missing in new activity Android Studio Unknown Bug
I am completely new to Android Studio and just learned Object-oriented programming. My project requires me to build something on open-source code. I added a new menu item to a menu and want to start another activity once the user clicks the menu item with id: plot. The intent will be sent from if (id == R.id.…
How do I make it so that the table is displayed inside the JFrame in Main?
I am currently making a program for my school project, it is a fast food order calculator, my problem is that I have to be able to display the table inside the JFrame in Main, if I add “frame.add(table);” inside Main, nothing happens. Any help would be appreciated, thank you! } Answer Add frame.ad…
How to get the File from an Upload component in Vaadin
I’m new with Vaadin, and I don’t know how to get the File from the Upload component, I’m always having a server error. I don’t think I understand properly how this works. Any help will be welcome. This is my code. Answer Here’s a code sample from one of my projects FlieUploader.j…
How to automatically generate id in sequence in spring jpa?
I need to make a one-to-many sequence as follows: for example: category sub category 1 1 1 2 2 1 2 2 2 3 3 1 Data model: enter image description here Java code/Mapping: Category class SubCategory class With the code above, I’m getting the following result: category sub category 1 1 1 2 2 3 2 4 2 5
How to create a map with an attribute as a key and a maximum value as a value
So, In college we are working with csv files and streams. Right now I am doing some homework but I’ve been stuck in this exercise for some days now. I have a csv file with some data about accidents (like the accident severity, the number of victims and so) and I have a function that reads that data and …
Ruducing a List of objects using Stream.reduce()
I have a list of objects, and I need to group objects having status equal to my customizedStatusto a single customized one with count = sumOfSameObjectsCount . We have class MyObject Suggested implementation : Things work like a charm in case there are multiple objects with status equal to my customizedStatus…
Auditing (@CreatedDate) does not work for WebFlux Spring Boot with reactive MongoDB
Does WebFlux Spring Boot with reactive MongoDB supports Auditing? I tried to use @CreatedDate and it did not work for me. Here is my configuration: Here is my document class Here is Message repository When I save message messageRepository.save(message) I always have createdDate=null Do I miss something or Aud…
I tried to set enum field by reflection
I have two enums with vararg property and @FieldEnrich annotation. Annotation looks like Annotation is processing by object The logic is as follows. We annotate an enum member with the annotation @FieldEnrich and pass the property we would like to read value from and the name of the field to which we set the …
NoSuchElementException Problem in User Input Java
I’m confused while using an Java program I created. Initially, when a user Ctrl+D during the input, it will promptly end the program and display an error in the form of this, Doing a bit of research I note that Ctrl+D terminates the input of sort. Therefore, I tried add few more lines to my codes to pre…