In this video, we will be seeing how to count occurrences of character in String using HashMap in Java.

Following would be the steps that we will be using:

1) Declare a Hashmap in Java of {char, int}.
2) Traverse in the string, check if the Hashmap already contains the traversed character or not.
3) If it is present, then increase its count using get() & put() function in Hashmap
4) Once the traversal is completed, traverse in the Hashmap and print the character and its frequency.

Java program to count the occurrence of each character in a string using Hashmap
https://www.geeksforgeeks.org/java-program-to-count-the-occurrence-of-each-character-in-a-string-using-hashmap/