Java Program to Count Occurrence of Each Character in a String

  • Java program to count the occurrence of each character if a string.

In this java program, we have to count the frequency of occurrence of each character of a string and then print it on screen.

For Example,
Input String : Apple
A : 1 times
e : 1 times
l : 1 times
p : 2 times

To count the frequency of each alphabet, we will first take a string as input from user. We will use an integer array of length 256 to count the frequency of characters. Initialize frequency array element with zero, which means initially the count of all characters are zero.
Using a for loop, traverse input string and increment the count of every character of input string. Finally, traverse the frequency array and print the frequency of every character.

Java program to count each character of a string


import java.util.Scanner;

 * Java Program to Count Character of a String
public class CharacterCount {
    public static void main(String args[]) {
        String str;
        int i, length, counter[] = new int[256];

        Scanner scanner = new Scanner(;
        System.out.println("Enter a String");
        str = scanner.nextLine();

        length = str.length();

        // Count frequency of every character and store
        // it in counter array
        for (i = 0; i < length; i++) {
            counter[(int) str.charAt(i)]++;
        // Print Frequency of characters
        for (i = 0; i < 256; i++) {
            if (counter[i] != 0) {
                System.out.println((char) i + " --> " + counter[i]);
Enter a String
A --> 1
E --> 1
L --> 1
P --> 2
Enter a String
A --> 1
C --> 3
E --> 2
H --> 2
O --> 1
R --> 2
S --> 2
T --> 1
U --> 1

Recommended Posts
Java Program to Delete all Vowel Characters from String
Java Program to Check Two Strings are Anagram or Not
Java Program to Concatenate Two Strings
Java Program to Find Length of a String
Java Program to Copy a String
Java Program to Delete All Spaces from a String
Java Program to Reverse a String
Java Program to Check Whether two Strings are Equal or Not
Java Program to Delete a Word from Sentence
Java Program to Print Right Triangle Star Pattern
Java Program to Print Pyramid Pattern of Stars
All Java Programs