Java: Group Anagrams

Difficulty Level: MEDIUM

Problem Statement:

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.

Input:

strs = ["eat", "tea", "tan", "ate", "nat", "bat"]  

Output:

[["eat","tea","ate"],["tan","nat"],["bat"]] 
Explanation:
- "eat", "tea", and "ate" are anagrams of each other.  
- "tan" and "nat" are anagrams of each other.  
- "bat" is not an anagram of any other string.