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

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

Count characters in a String or Sentence in Java

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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

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