I have the following POJO. And I create new indexes in the POJO my adding it. How can I have access to any index element once created? How I would be able to access the 3rd element from 3rd row? Answer First go to the 3rd element, then go the specific field that you want to access. in this case.
Tag: java
What would be the most efficient code of removing every key from a HashMap with the key value stored in an ArrayList? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 10 months ago. Improve this question Say I have an ArrayList with n elements and a HashMap with k elements, is there any faster…
Center shape defined in Cartesian coordinates in JPanel
I have a shape (triangle for example) defined in Cartesian coordinates and I’d like to translate the shape to the center of a JPanel. I’ve been able to translate about the JPanel’s 0,0 orientation, but I can’t figure out how to center based on the JPanel’s width and height. IR…
error: no suitable method found for newArrayList(String)
I am fairly new to Java and trying to use a Google Cloud service. When I am trying to use an explicit way to point my service account following this guide from this; https://cloud.google.com/docs/authentication/production#passing_code I already have installed requirements. However, this code throws an error a…
How to send the data finded in the controller to a view?
I try to do a java web application using: SpringBoot Mysql JDBC Design pattern: MVC, DAO And Thymeleaf I think i understood than: I must create a class for every Entity and a DAO classe who use the annotation @Repository: Diabetic.java(Entity): DiabeticDAO.java: And create a controller like this where I use t…
java JFileChooser how to temporarily disable file selection window
Is there a way how to temporarily disable file chooser in the JFileChooser window? I created custom preview JPanel and I need the next file selection to be made only after the file preview is done/created (it created image from Wavefront OBJ files when such obj file is selected in the file chooser window). Ma…
How to write a method that takes in a List of Integer, Float, Double and calculate the average?
I am trying to write a method that takes in a list of numeric values – eg List<Integer>, List<Float>, List<Double> etc – and give me the average. These are the errors I get: Operator ‘+’ cannot be applied to ‘capture<? extends java.lang.Number>’, …
Is it possible to convert the String “1L” to the corresponding Long value?
I am parsing a config file with the following instructions: The returned value, that is a String, is later converted into the expected type from the calling method. How can I convert the String 1L into a Long type? I tried: but it raises NumberFormatException. Is there a way to do it? Answer Neither Long.pars…
Spring Boot: Cannot load configuration class
I am currently creating my first Spring Boot application. Unfortunately, I get an error right at the beginning that I can’t understand. POM Only some rudimentary dependencies are defined here. Java 8 and Spring Boot 2.0.1 are to be used. App Here the application is defined as a SpringBoot application. T…
What is the command line equivalent for Intellij Download sources option?
When I view a decompiled class file from maven project in Intellij it has Download Sources button at the top. What is the command line equivalent of this button? I know there is a command mvn dependency:sources but it downloads sources for everything which makes Intellij/my web app lag so much that it is not …