Java Program to count the total number of characters in a string?

Example 1:

Input:
a = "Java is awesome"
Output:
Total characters without spaces :  13

1. Using charAt() to Count Total Characters in a Java String

This is the first approach, we are going to use to count characters in a String in Java.
Here we are going to iterate over the string and increase our counter for every time the character is nonspace.

Request: Before reading the code, read the algorithm and try on your IDE.

Algorithm

1. Let  a = “Java is awesome”
2. Let counter = 0
3. Using for loop to iterate over each index of the string
4. If any character is not space, then we’ll increase the counter
5. printing the counter as the count of total characters

Code

  Total characters without spaces : 13

2. Using Java 8 Stream to Count Characters in a Java String

This is the second method used for counting characters in a String in Java.
We will be using the new Java 8 Streams in this method.

Request: Before reading the code, read the algorithm and try on your IDE.

Algorithm

1. Let  a = “Java is awesome”
2. Then we’ll put variable count equal to input.chars().filter(ch –> ch!=‘ ‘).count() which is going over each character and checking if it’s space or not, For all non-space characters, it puts the total count in the count variable. 
3. printing the count as the count of total characters

Code

  Total characters without spaces : 13

3. Using String.length() to Count Total Characters in a Java String

This is the easiest way to find the total count of characters in a String.
We will be using the basic .length() method in order to find the total count.
In order to disclude spaces from our count, we will replace all space characters with non-space characters.

Request: Before reading the code, read the algorithm and try on your IDE.

Algorithm

1. Let  a = “Java is awesome”
2. Now, replace all space characters with non-space characters using replace() method
3. printing the count as the count of total characters using .length() method

Code

  Total characters without spaces : 13