Java program to count the total number of characters in the given string

In this article, we will discuss the concept of the Java program to count the total number of characters in the given string

In this post, we are going to learn how to count the total number of characters in the given string of Java programming language

Java program to count the total number of characters

Code to count the total number of characters using for loop

The program allows the user to enter a string and then It counts the characters of the given string using for loop in Java language

Program 1

import java.util.Scanner;
public class Count_WordOfString{
public static void main(String args[]){
String str; //variable declaration
int count=0;

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the String for count characters  ");
str=scan.nextLine();

//count each character without space
for(int i=0; i<str.length(); i++){
    if(str.charAt(i)!=' '){// this condition is used to avoid counting space
        count++;
    }
}
//display the total number of characters in te given string
System.out.print("The total number of character in a string :"+count);
}
}

When the above code is executed, it produces the following result

Case 1

Enter the String for count characters
Java language
The total number of character in a string:12

Case 2

Enter the String for count characters
Java programming language
The total number of character in a string:23

Approach

Declare a String variable as String str;
Declare and initialize an integer variable as int count=0;
The user asked to enter a string to count character
A for-loop is used to count total characters of the given string using the count variable
It is initialized as i=0, checks the condition whether i<str.length(); and executes the loop until the given condition becomes true
Use an if condition to test if(str.charAt(i)!=’ ‘), if it is true, count becomes count + 1(count=count+1)
Finally, the program displays the total number of the character using the count variable

Code to count the total number of characters using while loop

The program allows the user to enter a string and thereafter It counts the characters of the string using while loop in Java language

Program 2

import java.util.Scanner;
public class Count_WordOfString1{
public static void main(String args[]){
String str; //variable declaration
int count=0;

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the String for count characters  ");
str=scan.nextLine();

//count each character without space
int i=0;
while(i<str.length()){
    if(str.charAt(i)!=' '){// this condition is used to avoid counting space
        count++;
    }
     i++;
}
//display the total number of characters in te given string
System.out.print("Total number of character in a string:"+count);
}
}

When the above code is executed, it produces the following result

Enter the String for count characters
Java is an OOP language
The total number of character in a string:19

Approach

Declare a String variable as String str;
Declare and initialize an integer variable as int count=0;
The user asked to enter a string to count character
Declare and initialize an integer variable as int i=0;
A while-loop is used to count total characters of the given string using the count variable
The while loop checks the condition whether i<str.length(); and executes the loop until the given condition becomes true
Use an if condition to test if(str.charAt(i)!=’ ‘), if it is true, count becomes count + 1(count=count+1)
Finally, the program displays the total number of the character using the count variable

Code to count the total number of characters using do-while loop

The program allows the user to enter a string and then It counts the characters of the string using do-while loop in Java language

Program 3

import java.util.Scanner;
public class Count_WordOfString2{
public static void main(String args[]){
String str; //variable declaration
int count=0;

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the String for count characters  ");
str=scan.nextLine();

//count each character without space
int i=0;
do{
    if(str.charAt(i)!=' '){// this condition is used to avoid counting space
        count++;
    }
     i++;
}while(i<str.length());
//display the total number of characters in te given string
System.out.print("Total number of character in a string:"+count);
}
}

When the above code is executed, it produces the following result

Enter the String for count characters
Java easy language for beginners
The total number of character in a string:28

Approach

Declare a String variable as String str;
Declare and initialize an integer variable as int count=0;
The user asked to enter a string to count character
Declare and initialize an integer variable as int i=0;
A do-while loop is used to count total characters of the given string using the count variable
The do-while loop checks the condition whether i<str.length(); and executes the loop until the given condition become true
use an if condition to test if(str.charAt(i)!=’ ‘), if it is true, count becomes count + 1(count=count+1)
finally, the program displays the total number of the character using the count variable