How to count vowels and consonants in given string in Java?



Problem Description :


Write a program in Java that counts vowels and consonants present in String.

Concept :


There are only 5 alphabets (A, E, I, O, U) that are vowels, other alphabets are consonants.We are using regular expressions to solve this problem. For example - "java" has 2 vowels (a, a) and 2 consonants (j, v).


Java Program :


package com.javamultiplex.string;

import java.util.Scanner;

/**
 * 
 * @author Rohit Agarwal
 * @category String Interview Questions
 * @problem How many vowels and consonants present in String?
 *
 */
public class CountVowelsAndConsonants {

 public static void main(String[] args) {

  Scanner input = null;
  try {
   input = new Scanner(System.in);
   System.out.println("Enter String : ");
   String string = input.next();
   // Converting String to lower case
   string = string.toLowerCase();
   int length = string.length();
   // Regular expression that matches a string containing a,e,i,o or u.
   String vowelsPattern = "[aeiou]";
   /**
    * Regular expression that matches a string containing other than
    * a,e,i,o or u.
    */
   String consonantsPattern = "[b-d]|[f-h]|[j-n]|[p-t]|[v-z]";
   String temp = null;
   int vowels = 0, consonants = 0;
   for (int i = 0; i < length; i++) {
    temp = String.valueOf(string.charAt(i));
    if (temp.matches(vowelsPattern)) {
     vowels++;
    } else if (temp.matches(consonantsPattern)) {
     consonants++;
    }
   }
   System.out.println("Vowels : " + vowels);
   System.out.println("Consonants : " + consonants);
  } finally {
   if (input != null) {
    input.close();
   }
  }

 }

}



Output :


Output of Java program that counts vowels and consonants in string.
Output - How to count vowels and consonants in String in Java?

References :




Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Interview Questions on String, Count vowels and consonants, Solution in Java, Regular expressions, if else statement, for loop.

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How to count vowels and consonants in given string in Java? How to count vowels and consonants in given string in Java? Reviewed by Rohit Agarwal on 1/04/2017 Rating: 5

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