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Check whether two Strings are Anagram of each other using HashMap in Java
  • Difficulty Level : Basic
  • Last Updated : 01 Aug, 2019

Write a function to check whether two given strings are an Anagram of each other or not.

An anagram of a string is another string that contains the same characters, only the order of characters can be different.

For example, “abcd” and “dabc” are an Anagram of each other.


Approach: Hashmaps can also be used to find if any two given strings are anagrams or not, by mapping the characters of each string to individual hashmaps and comparing them together.






// Java code to check whether two strings
// are Anagram or not using HashMap
import java.util.*;
class GFG {
    // Function to check whether two strings
    // are an anagram of each other
    static boolean areAnagram(String str1, String str2)
        HashMap<Character, Integer> hmap1
            = new HashMap<Character, Integer>();
        HashMap<Character, Integer> hmap2
            = new HashMap<Character, Integer>();
        char arr1[] = str1.toCharArray();
        char arr2[] = str2.toCharArray();
        // Mapping first string
        for (int i = 0; i < arr1.length; i++) {
            if (hmap1.get(arr1[i]) == null) {
                hmap1.put(arr1[i], 1);
            else {
                Integer c = (int)hmap1.get(arr1[i]);
                hmap1.put(arr1[i], ++c);
        // Mapping second String
        for (int j = 0; j < arr2.length; j++) {
            if (hmap2.get(arr2[j]) == null)
                hmap2.put(arr2[j], 1);
            else {
                Integer d = (int)hmap2.get(arr2[j]);
                hmap2.put(arr2[j], ++d);
        if (hmap1.equals(hmap2))
            return true;
            return false;
    // Test function
    public static void test(String str1, String str2)
        System.out.println("Strings to be checked are:\n"
                           + str1 + "\n" + str2 + "\n");
        // Find the result
        if (areAnagram(str1, str2))
            System.out.println("The two strings are "
                               + "anagrams of each other\n");
            System.out.println("The two strings are not"
                               + " anagrams of each other\n");
    // Driver program
    public static void main(String args[])
        // Get the Strings
        String str1 = "geeksforgeeks";
        String str2 = "forgeeksgeeks";
        // Test the Strings
        test(str1, str2);
        // Get the Strings
        str1 = "geeksforgeeks";
        str2 = "geeks";
        // Test the Strings
        test(str1, str2);



Strings to be checked are:

The two strings are anagrams of each other

Strings to be checked are:

The two strings are not anagram of each other

Related Article: Check whether two strings are anagram of each other

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