Find Number Of Duplicate Characters In A String Java

Understanding the Problem

Now that we understand the problem, let's move on to the Java solution. We'll create a function called 'findDuplicateCharacters' that takes a string as input and returns the number of duplicate characters. We'll use a HashMap to store the frequency of each character, and then we'll iterate through the map to count the number of duplicate characters. The function will return the total count of duplicate characters, and we can use this value as needed in our application. With this solution, you'll be able to easily find the number of duplicate characters in any string using Java.