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.

Java program that counts vowels and consonants in given string.

Count vowels and consonants 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 - How to count vowels and consonants in String in Java?

References :

https://en.wikipedia.org/wiki/Regular_expression

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

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

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