Java program to Count the Total number of Characters in a String

In this post you will see the basic java string program that count the total number of characters in a string.

Here, first we understand that what is string,

String:

String is a sequence of characters; string is immutable that means once we created a string, we can’t change its value. In Java the String class found in java.lang package.

Example: String s =”Hello”;

Problem:

Example of the problem –

 Input :

Enter a string: Hello, World!

 Output :

Total number of characters in this string : 13

Explanation:

in this example we entered the string “Hello, World!“, and the program calculated that it has 13 characters.

Solutions:

There are few ways to find the number of characters in string:

• using length() method.
• using for or while loop.

First, length() method returns the number of characters in the string, including whitespace and other non-visible characters.

Approach 1 : using length() method:

class Main
{
public static void main(String []args){
String s ="Hello World"; // declare and initialize string
int count =s.length();
System.out.println("The string has  "+count+" characters");  //print the total characters
}
}

Output:

The string has 5 characters

Approach 1 :  using for Loop:

Algorithm:

1. Start
2. Make a string declaration and initial value.
3. Declare and initialize a variable to count the total number of characters in the given string.
4. To calculate the same, use a for a loop.
5. To avoid counting space, use an if condition.
6. Each time a character appears, increase the count.
7. Display the total number of characters in the provided string.
8. Stop.

public class Main
{
  public static void main(String[] args)
  {    
        int count = 0;
        String str = "Hello World";      
        System.out.println("The given string: "+str);    
        //Except for the space, count the characters in the string.    
        for(int i = 0; i < str.length(); i++)
        {    
            if(str.charAt(i) != ' ')    
                count++;    
        }                
        //displays the number of characters in string    
        System.out.println("The string contains number of characters: " + count);    
    }      
}

Output:

The given string: Hello World
The string contains number of characters: 10

 

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