Added Anagram Checker in Java

[farheen-shaikh530]

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✅ Features

• Ignores case ("Listen" and "Silent" are anagrams)
• Ignores whitespace ("Clint Eastwood" and "Old West Action")
• Uses HashMap for character frequency count
• Efficient: Time Complexity: O(n) | Space Complexity: O(n)
• Demonstrates mid-level Java skills:
  • String manipulation
  • HashMap usage
  • Input sanitization
  • Edge case handling

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💡 How It Works

1. Converts both strings to lowercase and removes all spaces.
2. Uses a HashMap<Character, Integer> to count the frequency of each character in the first string.
3. Iterates over the second string and decrements the character counts.
4. If all frequencies return to zero and the map is empty, the strings are anagrams.

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🧪 Example

public static void main(String[] args) {
    String s1 = "Listen";
    String s2 = "Silent";

    if (areAnagrams(s1, s2)) {
        System.out.println("\"" + s1 + "\" and \"" + s2 + "\" are anagrams.");
    } else {
        System.out.println("\"" + s1 + "\" and \"" + s2 + "\" are NOT anagrams.");
    }
}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.07%. Comparing base (ed4a724) to head (f58d61a).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6281   +/-   ##
=========================================
  Coverage     74.07%   74.07%           
  Complexity     5351     5351           
=========================================
  Files           677      677           
  Lines         18648    18648           
  Branches       3621     3621           
=========================================
  Hits          13813    13813           
  Misses         4276     4276           
  Partials        559      559           

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🚀 New features to boost your workflow:

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[vil02]

All of these are already implemented. Additionally please place your code in src/main/java/com/thealgorithms.