Java Program to Count Characters in a String

Problem: Write a Java program to count the number of characters in a given string.

The input string can also have white space which is definitely not a character, so we don’t need to count them.

Steps to count characters of a String in Java:

Input a string (str).
Run a loop from 0 to str.length().
1. Read the character at position ‘i’ using str.charAt(i) as ch.
2. Check if(ch!=’ ‘), If so then increment counter (c++).
Print c.

Here is the Java program that implements the above steps:

import java.util.Scanner;

public class CountCharacters {

public static void main(String args[]){

Scanner in = new Scanner(System.in);

String str; //To store string

char ch; //To store a single character

int c=0; //counter

//input string

System.out.println("Enter a String/Sentence");

str = in.nextLine();

//Loop through each character

for(int i=0; i<str.length(); i++){

//Read character at 'i'

ch = str.charAt(i);

//check if the character is not blank space,

//if so then increment 'c'

if(ch != ' ')

c++;

}

//ouput counter

System.out.println("Total characters: "+c);

}

Note: Use nextLine() instead of next() for sentence as the input.

Output:

Enter a String/Sentence pencil programmer Total characters: 16 Enter a String/Sentence pencil programmer Total characters: 16