Testdome Java Questions And Answers Jun 2026

import java.util.ArrayList; import java.util.LinkedHashSet; import java.util.List; import java.util.Set; public class UniqueProducts public static String[] filterUnique(String[] products) if (products == null) return new String[0]; // LinkedHashSet maintains insertion order while removing duplicates Set uniqueSet = new LinkedHashSet<>(); Set lowerCaseTracker = new LinkedHashSet<>(); for (String product : products) if (product != null) String lower = product.toLowerCase().trim(); if (!lowerCaseTracker.contains(lower)) lowerCaseTracker.add(lower); uniqueSet.add(product); return uniqueSet.toArray(new String[0]); public static void main(String[] args) String[] input = "Apple", "banana", "APPLE", "Orange", "Banana"; String[] result = filterUnique(input); for (String p : result) System.out.println(p); // Output: Apple, banana, Orange Use code with caution. Key Logic Breakdown:

import java.util.*;

Know when to use contiguous memory versus node-based lists. HashMap and HashSet : Essential for lookups, tracking duplicates, and frequency counting. testdome java questions and answers

: These test your knowledge of Java syntax, object-oriented programming (OOP) principles, and the Java Collections Framework. import java