Testdome Java Questions And Answers

ArrayDeque offers O(1) insertion/removal at both ends. LinkedList would also work but uses more memory. Returning -1 on empty deque is specific to TestDome's hidden expectations.

while (i < a.length) result[k++] = a[i++];

import java.util.HashMap; public class TwoSum public static int[] findTwoSum(int[] list, int sum) HashMap map = new HashMap<>(); for (int i = 0; i < list.length; i++) int complement = sum - list[i]; if (map.containsKey(complement)) return new int[] map.get(complement), i ; map.put(list[i], i); return null; Use code with caution. Copied to clipboard

The best resource is (two free Java questions) and GitHub repositories where candidates share their solutions. But now, with this guide and the ready-to-use answers above, you're already ahead of 80% of applicants.

class Product String name; double price; String category; // constructor, getters omitted for brevity testdome java questions and answers

public class Test public static int findMax(int[] arr) int max = arr[0]; for (int i = 1; i < arr.length; i++) if (arr[i] > max) max = arr[i];

: Understanding class hierarchies and "Cache Casting" (e.g., determining if a DiskCache can be cast to a base Cache class).

public class TwoSum { public static int[] findTwoSum(int[] nums, int target) { Map<Integer, Integer> map = new HashMap<>(); for (int i = 0; i < nums.length; i++) int complement = target - nums[i]; if (map.containsKey(complement)) return new int[] map.get(complement), i ;

// Step 1: Create an interface interface AlertDAO UUID addAlert(LocalDateTime time); LocalDateTime getAlert(UUID id); ArrayDeque offers O(1) insertion/removal at both ends

You write code directly in a browser-based IDE supporting Java 8 or higher.

public class LongestConsecutive public static int longestConsecutive(int[] nums)

// Given a list of permissions (READ, WRITE, DELETE), return true if user can perform action enum Permission READ, WRITE, DELETE class User Set<Permission> permissions; public boolean can(Permission p) ...

return set.toArray(new String[0]);

A user is submitting a text input field in a UI. The system needs to check if the input is a valid number, but the current code handles NullPointerExceptions improperly or fails on special characters. Goal: Fix the bug to properly parse integers.

Proper implementation of List , Set , Map , ArrayList , and HashMap .

If you are preparing for a Java assessment, is a popular platform that focuses on practical coding tasks rather than just theory. Their questions typically test your ability to solve real-world problems using Java's core libraries, object-oriented principles, and data structures.