Check whether a character is a Vowel or Consonant

In this program, you will learn to check whether a character is a Vowel or Consonant in Java. The vowels are ‘a’, ‘e’, ‘i’, ‘o’, and ‘u’, and all remaining characters from the alphabet are consonants.

Let’s see a few java program examples of it below:

Example-1. Find if a character is a Vowel or Consonant in Java

Here, we check whether the given character matches any of the 5 vowels or not. If yes, the given character is a Vowel, else Consonant. Let’s assume that the user will always enter an alphabet character.

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant {

	public static void main(String[] args) {
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		// Check Vowel or Consonant
		if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
			System.out.println("The given character is a Vowel.");
		} else {
			System.out.println("The given character is a Consonant.");
		}

	}

}

OUTPUT:

Enter an alphabet character:
a
The given character is a Vowel.

Example-2. handle capital letter Vowels

In this example, if user gives the character in capital letters also it will handle. Here we are checking given character with all 5 vowels in lowercase as well as uppercase.

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant2 {

	public static void main(String[] args) {
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		// Check Vowel or Consonant
		if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E' || ch == 'I'
				|| ch == 'O' || ch == 'U') {
			System.out.println("The given character is a Vowel.");
		} else {
			System.out.println("The given character is a Consonant.");
		}

	}

}

OUTPUT:

Enter an alphabet character:
X
The given character is a Consonant.

NOTE:

In the above two examples, assumes that the user will enter an alphabet character only. If the user enters a non-alphabetic character, it displays the character is a consonant which is wrong.

To fix this, first, we will check whether the given character is an alphabetic character or not using isAlphabetic() method. It is a method available in the Character class in Java.

Example-3. if the user enters a non-alphabetic character

In this example, if the user enters a non-alphabetic character, it will print error message “Error! Non-alphabetic character.”

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant3 {

	public static void main(String[] args) {
		
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		if (!Character.isAlphabetic(ch)) {
			// Non-alphabet character
			System.out.println("Error! Non-alphabetic character.");
		} else if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E' || ch == 'I'
				|| ch == 'O' || ch == 'U') {
			// Vowel
			System.out.println("The given character is a Vowel.");
		} else {
			// Consonant
			System.out.println("The given character is a Consonant.");
		}

	}

}

OUTPUT:

Enter an alphabet character:
5
Error! Non-alphabetic character.

Example-4. Check whether a Character is a Vowel or Consonant using switch case

The switch expression is evaluated once. The value of the expression is compared with the values of each case.

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant4 {

	public static void main(String[] args) {
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		if (!Character.isAlphabetic(ch)) {
			// Non-alphabet character
			System.out.println("Error! Non-alphabetic character.");
			return;
		}

		boolean isVowel = false;

		// Check vowel using switch case
		switch (ch) {
		case 'a':
		case 'e':
		case 'i':
		case 'o':
		case 'u':
		case 'A':
		case 'E':
		case 'I':
		case 'O':
		case 'U':
			isVowel = true;
		}

		// Print the result
		if (isVowel) {
			System.out.println("The given character is a Vowel.");
		} else {
			System.out.println("The given character is a Consonant.");
		}

	}

}

OUTPUT:

Enter an alphabet character:
U
The given character is a Vowel.

Example-5. find Vowel or Consonant using a String with all Vowel Characters.

In this example, we will take a String with all vowel characters ie- “aeiouAEIOU“, and check whether the given character is available in this string or not.

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant5 {

	public static void main(String[] args) {
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		// All Vowels (lowercase and uppercase)
		String allVowels = "aeiouAEIOU";

		// Check given character is an alphabet or not
		if (Character.isAlphabetic(ch)) {

			// Check the character available in allVowels
			if (allVowels.indexOf(ch) != -1) {
				System.out.println("The character " + ch + " is a Vowel.");
			} else {
				System.out.println("The character " + ch + " is a Consonant.");
			}
		} else {
			// Non-alphabet character
			System.out.println("Error! " + ch + " is a Non-alphabetic character.");
		}
	}

}

OUTPUT:

Enter an alphabet character:
y
The character y is a Consonant.

Example-6. find if a character is vowel or Consonant using ternary operator (? 🙂

In this example, we use ternary operator (? 🙂 to find whether a given character is a Vowel or Consonant.

package com.javacodepoint.basics;

import java.util.Scanner;

public class CheckVowelConsonant6 {

	public static void main(String[] args) {
		// Create scanner object to read user input
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter an alphabet character: ");
		char ch = sc.next().charAt(0);

		// Check whether a character is Vowel or not
		boolean isVowel = (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E'
				|| ch == 'I' || ch == 'O' || ch == 'U') ? true : false;

		// Print the result
		if (isVowel)
			System.out.println("The given character is a Vowel.");
		else
			System.out.println("The given character is a Consonant.");

	}

}

OUTPUT:

Enter an alphabet character:
e
The given character is a Vowel.

See also:
Java Program to Check Whether a Number is Even or Odd.
How to count the occurrence of the given character in a string in java?

Java logical programs list


Java Basic Programs

Java String Programs

Java Miscellaneous Programs

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