Java Program to Find the Frequency of Character in a String

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Program to Find the Frequency of Character in a String

In this article we will see how we can find frequency of a character in a String.

Frequency of Character:

We know string is combination of characters. So, in a string it may happen that a particular string may occur only once or multiple times.

So in this program we will count how many times a character is occurring in a string.

For example:

"You are studying from BTechGeeks" is a string.
In which,
Character 'e' is present 4 times.
Character 'h' is present only once.
Character 'r' is present 3 times.

Let’s see the below approach how to do it.

Method: Find frequency of a character using for loop

By using for loop we can find the number of frequency of a particular character in a string.

Approach:

  • Take a character variable ch.
  • Take an integer variable count.
  • ch will contain the character of which you are finding frequency.
  • Initialize count with 0.
  • ┬áTake a for loop and match the character of which you are finding the frequency with each character of the string.
  • During iteration if any characters matches then increment the count value.

Program:

public class Main
{

public static void main(String[] args)
{
String s = "You are studying from BTechGeeks";
char ch = 'e';
int count = 0;

for(int i = 0; i < s.length(); i++) {
if(ch == s.charAt(i)) {
count++;
}
}

System.out.println("Frequency of " + ch + " = " + count);
}
}
Output:

Frequency of e = 4

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