👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-05

java arraylist collections Java

I've been banging my head against this for hours. I'm working on a personal project and I'm experimenting with I've looked through the documentation and I'm still confused about I'm working with an scenario when trying to remove duplicate entries from a `java.util.ArrayList`. I want to remove all instances of a specific object from the list, but I'm noticing that after calling the `remove()` method, not all duplicates are being removed. Here's the code snippet I am using: ```java import java.util.ArrayList; public class RemoveDuplicates { public static void main(String[] args) { ArrayList<String> list = new ArrayList<>(); list.add("apple"); list.add("banana"); list.add("apple"); list.add("orange"); System.out.println("Before removal: " + list); String itemToRemove = "apple"; list.remove(itemToRemove); System.out.println("After removal: " + list); } } ``` I expect the output after removal to be `["banana", "orange"]`, but instead, I see the output as `["banana", "apple", "orange"]`. The `remove()` method only seems to remove the first occurrence of the specified item, which is not what I intended. I've also tried using a loop to iterate through the list and remove the duplicates, but that also resulted in a `ConcurrentModificationException`. I need a way to remove all instances of a specific item from the list efficiently. Is there a best practice for doing this in Java? Should I consider using a different data structure, or is there a more straightforward approach with `ArrayList` that I am missing? Any suggestions would be greatly appreciated. I'm working on a CLI tool that needs to handle this. Am I missing something obvious? I'm working on a microservice that needs to handle this. Is there a better approach? I'm working in a macOS environment. Any pointers in the right direction? My development environment is Ubuntu 20.04. Am I approaching this the right way?