I’ve read that The elements of an array are stored in a contiguous memory location . Is it always the case ? I understand this is the case with array of primitives. I’m a bit confused about array of objects. An array of objects basically contains reference of the real objects right? references mus…
Tag: java
Why does root path in my controller maps to index.html in spring boot web application?
I’m testing a controller for a Spring Boot application. I want to map a resource to a path, which should be a part of my API. My controller is pretty specific about path: Here ‘web-interface’ is a property, as specified in application.yml file Expected behavior: path: localhost:8080/admin ma…
android Spinner requires 2 clicks to work
am trying to use a spinner within a fragment to categorize the output of my recycler view when I call the recycler view function from the onCreateView it works perfectly. however, when I call it from the spinner function, it requires 2 clicks to display. here is the spinner XML code: and here is the fragment:…
OpenGL ES rotating shape around its center
I tried to rotate rectangle using rotateMatrix, following tutorial on https://developer.android.com/training/graphics/opengl/motion, but when I runned it, the rectangle is rotating around (I think) point 0,0. What do I need to change to make it rotate around it’s center? Answer If you want to rotate aro…
ANTLR AST visitor that returns different data types
I finished converting the ANTLR CST into an AST and created a specific Visitor<T> interface that allows me to visit all my AST nodes, but the main issue i’m having is that some visits should return different data types, and i’m not sure how to go about this. For example, for simple arithmeti…
“b’OCI runtime create failed: container_linux.go:380?
Client Error: Bad Request (“b’OCI runtime create failed: container_linux.go:380: starting container process caused: exec: “/usr/lib/jvm/java-8-openjdk-amd64/bin/java”: stat /usr/lib/jvm/java-8-openjdk-amd64/bin/java: no such file or directory: unknown’”) this my error ,I cannR…
Why ‘java.net.SocketException: Socket closed’ after ‘java.net.ConnectException: Connection refused’?
I’m trying to connect to a remote host trying over and over waiting for it to come up. However, after one shot with a Connection Refused exception (because the server isn’t running yet), it throws Socket closed exception continuously. Why would the socket be closed? The socket should simply be in …
Jackson ObjectMapper JSON to Java Object RETURNS NULL Values
I’m trying to loop through the child object of a JSON array which stores objects. My JSON file is as follows: I would like to iterate through the each of the object of the JSON array and output them to the console window with: I can parse with Although, this gives me the whole JSON file and does not rea…
Using queue to rearrange every other integer
I’m trying to figure out how to take in an integer and rearrange them so that every alternating character is saved (So the [1, 2, 3, 4, 5, 6] would return [1, 4, 2, 5, 3, 6]). I think a queue would be the best to use for this problem so here’s what I have so far. It returns [3,
Delete from a JPARepository with an EmbeddedId by a field in the primary key
Currently I have a Spring Boot application using JpaRepository<Employee, EmployeePk> where let’s say EmployeePk is firstname, lastname. Is there a way to delete by Primary Key field without having to specify a custom @Query? It’s ok to delete multiple rows if multiple people were named ̶…