Vowel and Consonant program in Java

In the given Java program, you will learn how to check whether the given character is a vowel or consonant.

The alphabet is made up of 26 letters, 5 of which are vowels (a, e, i, o, u) and the rest of which are consonants. There are different ways in Java programming to check whether an alphabet is a vowel or consonant. Here, we have mentioned three of them.

Using If Else statement

In the below implementation, we check if the entered character corresponds to any of the five vowels. And if it matches, "Vowel" is printed, else "Consonant" is printed.

// Java program for counting vowels
import java.util.Scanner;

public class CheckVowelConsonant {
    public static void main(String[] args) {
        System.out.print("Please enter a character: ");
        Scanner sc = new Scanner(System.in);
        char chr = sc.next().charAt(0);

        if(chr == 'a' || chr == 'e' || chr == 'i' 
        || chr == 'o' || chr == 'u' )
            System.out.println(chr + " is vowel.");
        else
            System.out.println(chr + " is consonant.");

    }
}

Output of the above code:

Please enter a character: p
p is consonant.

Please enter a character: u
u is vowel.

Using Switch Statement

In the given Java program, instead of using an if condition, we replace it with a switch case statement.

// Java program for counting vowels
import java.util.Scanner;
class CheckVowelConsonant
{
	public static void main(String[ ] arg)
	{
	int i=0;
	Scanner sc=new Scanner(System.in);
	System.out.print("Enter a character: ");
	char chr=sc.next( ).charAt(0);
	
	switch(chr)
	{
	 case  'a' :
	 case 'e'  :
	 case 'i'  :
	 case 'o'  :
	 case 'u'  :
	 case  'A' :
	 case 'E'  :
	 case 'I'  :
	 case 'O'  :
	 case 'U'  :
	     i++;
	}
	if(i==1)
	System.out.println(chr+" is vowel.");
	else 
		if((chr>='a'&&chr<='z')||(chr>='A'&&chr<='Z'))
		System.out.println(chr+" is consonent.");
		else
		System.out.println("Not an alphabet.");		
	}
}

Output of the above code:

Enter a character: h
h is consonent.

Enter a character: i
i is vowel.

Enter a character: M
M is consonent.

Using indexOf() Method

The indexOf() method returns the index within this string of the first occurrence of the specified substring, starting at the specified index. Here, we have used this method to check whether the entered character is in the list of vowels.

// java program to check whether input
// character is a vowel or consonant
  
import java.io.*;
import java.util.Scanner;
  
class CheckVowelConsonant {
    // Function to find whether an input
    // character is vowel or not
    static String chkVowel(char ch)
    {
        // Make the list of vowels
        String str = "aeiouAEIOU";
        return (str.indexOf(ch) != -1) ? "vowel"
                                       : "consonant";
    }
  
    // Driver Code
    public static void main(String[] args)
    {
        System.out.print("Please enter a character: ");
        Scanner sc = new Scanner(System.in);
        char chr = sc.next().charAt(0);
        System.out.println(chr+" is a "+chkVowel(chr));
    }
}

Output of the above code:

Please enter a character: m
m is a consonant

Please enter a character: p
p is a consonant

Please enter a character: u
u is a vowel

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