I’m solving Codility questions as practice and couldn’t answer one of the questions. I found the answer on the Internet but I don’t get how this algorithm works. Could someone walk me through it step-by-step? Here is the question: And here is the solution I found with my comments about parts which I don’t understand: Answer So what the code
Gradle project error – java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
This is my main application code: I’m using gradle to build the project. Even though SpringApplication file is properly imported I’m getting the following error: I’m getting following gradle message when I hover over SpringApplication Any help would be much appreciated. Thanks in advance! Answer The error was because of an issue with gradle 3.4 I’ve changed my gradle distribution
JavaFX search in listview
I want to search in listview and my code is working but not well enough. The problem is when i write few characters in the search text field not only the result appears, but the rest of the items also appear… The code: Photos: Original list: Sorted list: ListCell implementation: Answer Your problem is not in your filter logic. I
Jackson error “Illegal character… only regular white space allowed” when parsing JSON
I am trying to retrieve JSON data from a URL but get the following error: My code: The url constructed is i.e https://www.example.org/api/search.json?keywords=iphone&count=50 What is going wrong here? And how can I parse this data successfully? Imports: example response Answer The message should be pretty self-explanatory: There is an illegal character (in this case character code 31, i.e. the control
How to merge multiple rectangles into one polygon
I am struggling with this part of my task at work. I’ve deliberately not detailed the context of the work task to try and keep the focus on the problem. I have to merge rectangles into a single polygon as shown in the attached image, but I need the list of points so that I can write these out into
NoSuchMethodError in shapeless seen only in Spark
I am trying to write a Spark connector to pull AVRO messages off a RabbitMQ message queue. When decoding the AVRO messages, there is a NoSuchMethodError error that occurs only when running in Spark. I could not reproduce the Spark code exactly outside of spark, but I believe the two examples are sufficiently similar. I think this is the smallest
Cannot change dependencies of configuration ‘:compile’ after it has been resolved
I have a simple java project that uses json.jar library. gradle.build file content is: problem is when I want to add json to my classpath and use it, this error happens how can I solve this? Answer First, you have to add a repositories block to specify where dependencies are retrieved from (usually before dependencies {…}. Then, if you put
Run a Maven Project using IntelliJ IDEA
I’m new to IntelliJ IDEA and I would like to run a simple Maven Quickstart project using it. I followed all the instructions, the project was sucessfully built. But when I try to compile and run it , the Run button is not activated. It looks like IntelliJ IDEA couldn’t figure out where the main class is. This is a
Java – How to handle special characters when compressing bytes (Huffman encoding)?
I am writing a Huffman Compression/Decompression program. I have started writing my compression method and I am stuck. I am trying to read all bytes in the file and then put all of the bytes into a byte array. After putting all bytes into the byte array I create an int[] array that will store all the frequencies of each
When should I use streams?
I just came across a question when using a List and its stream() method. While I know how to use them, I’m not quite sure about when to use them. For example, I have a list, containing various paths to different locations. Now, I’d like to check whether a single, given path contains any of the paths specified in the