Java Program to Find Frequency of a Given Character in a String

This article is created to cover a program in Java that find and prints the frequency or the occurrences of a given character in a given string. For example, if given string is codescracker and character is c, then the output will be 3, because 'c' occurs 3 times in the string "codescracker".

The question is, write a Java program to find frequency of a character in a string. Both character and string must be received by user at run-time of the program. The program given below is the answer to this question:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      String str;
      char ch, strCh;
      int strLen, i, count=0;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the String: ");
      str = s.nextLine();
      System.out.print("\nEnter a Character to Find its Frequency: ");
      ch = s.next().charAt(0);
      
      strLen = str.length();
      for(i=0; i<strLen; i++)
      {
         strCh = str.charAt(i);
         if(ch==strCh)
            count++;
      }
      
      System.out.println("\nFrequency = " +count);
   }
}

Here is its sample run with user input codescracker as string and c as character to find its frequency:

java find frequency of character in string

The above program can also be created/written in this way:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      int strLen, i, count=0;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the String: ");
      String str = s.nextLine();
      System.out.print("\nEnter a Character to Find its Frequency: ");
      char ch = s.next().charAt(0);
      
      for(i=0; i<str.length(); i++)
      {
         if(ch==str.charAt(i))
            count++;
      }
      
      if(count==0)
         System.out.println("\nThe character \'" +ch+ "\' is not found in the String.");
      else
         System.out.println("\nThe Frequency of character \'" +ch+ "\' = " +count);
   }
}

Here is its sample run with user input codescracker dot com as string and c as character to find its frequency or occurrences:

java frequency of given character in string

Here is another sample run with user input Java is fun as string and b as character:

find frequency of given character in string java

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