Java Program to Count Characters in a String

In this problem, we need to write a java program to count the number of characters in a String.

The input string can also include blank space which is definitely not any type of character, hence we do need to count those.

Steps to Count Characters in a String in Java

Take input a string (str).
Run a loop from 0 to str.length().
Read the character at position ‘i’ using str.charAt(i) into (ch).
If (ch) blank space then increment counter (c++).
Print the value of (c) after loop ends.

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

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

str = in.nextLine();

//Loop through each character

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

ch = str.charAt(i); //Read character at 'i'

if(ch != ' ')

c++; //If the character is not blank space increment 'c'

}

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

}

Note: To take sentence as input use nextLine() instead of next().

Output

Enter a String/Sentence

pencil programmer

Total characters: 16

Enter a String/Sentence

pencil programmer

Total characters: 16

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