Write a Java Program to count the number of letters, numbers ,spaces and others in a string

import java.util.Scanner;

public class CountingProgram

{          

           static void count(String x){

                              char[] ch = x.toCharArray();

                              int letter = 0;

                              int space = 0;

                              int num = 0;

                              int other = 0;

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

                                      if(Character.isLetter(ch[i])){

                                             letter ++ ;

                                      }

                                      else if(Character.isDigit(ch[i])){

                                             num ++ ;

                                      }

                                      else if(Character.isSpaceChar(ch[i])){

                                             space ++ ;

                                      }

                                      else{

                                             other ++;

                                      }

                              }

                              System.out.println("user input : "+x);

                              System.out.println("letter: " + letter);

                              System.out.println("space: " + space);

                              System.out.println("number: " + num);

                              System.out.println("other: " + other);

                              }

         public static void main(String[] args)

         {       Scanner s= new Scanner(System.in);

                  System.out.println("enter any number or letter");

                        String test = s.nextLine();

                    CountingProgram.count(test);

         }  

}

Output :

enter any number or letter

Darga blogs 715

user input : Darga blogs 715

letter: 10

space: 2

number: 3

other: 0

Explanation :

1.import java.util.Scanner;: This line imports the Scanner class from the java.util package, which is used to read input from the user.

 
2.The CountingProgram class is defined with the following methods:

 
3.The main method:

• Creates a new Scanner object s to read input from the user.
• Asks the user to enter a string: System.out.println("enter any number or letter");
• Reads the user's input as a line of text using s.nextLine() and assigns it to the test variable.
• Calls the count method of the CountingProgram class, passing the user's input as an argument.
• count(String x): This method takes a string x as input and counts the occurrences of letters, spaces, digits, and other characters in the input string. It does so by converting the input string to a character array and then iterating through each character to check its type using various Character class methods like Character.isLetter, Character.isDigit, and Character.isSpaceChar.

4. Inside the count method

• char[] ch = x.toCharArray();: Converts the input string x into a character array ch.
• int letter = 0;, int space = 0;, int num = 0;, int other = 0;: Initialize counters for letters, spaces, digits, and other characters.
• The for loop iterates through each character in the character array:
•     if(Character.isLetter(ch[i])): Checks if the character is a letter.
•     else if(Character.isDigit(ch[i])): Checks if the character is a digit.
•     else if(Character.isSpaceChar(ch[i])): Checks if the character is a space.
•     else: This block covers any character that doesn't fall into the previous categories.

After the loop, the program prints out the input string and the counts of different types of character