Write a program in Java to check if a character is an uppercase vowel or lowercase vowel or not

Java program to check given alphabet is an uppercase or lowercase vowel or not

In this program, we just have to find given user input character is uppercase or lowercase vowel or not.

We will seen two solution approach for this problem

1. Using List
2. Using Switch Case
   

Example :

Input : 'A'
Output : Character is UpperCase Vowel 

Input : 'e'
Output : Character is LowerCase Vowel

Input : 'j'
Output : Character is Not a Vowel

Solution Approach :

We will use ArrayList for store vowels and check if given character is uppercase or lowercase vowel or not. 

So lets jump on code.

Solution 1 : Using List

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class CheckVowelsCase {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Character");
        char ch = sc.next().charAt(0);
        String answer = checkVowels(ch);
        System.out.println(answer);
    }
    
    static String checkVowels(Character ch) {
       
        List<Character> listOfUpperCase = new ArrayList<>() {{
            add('A');
            add('E');
            add('I');
            add('O');
            add('U');
        }};
       
        List<Character> listOfLowerCase = new ArrayList<>() {{
            add('a');
            add('e');
            add('i');
            add('o');
            add('u');
        }};

        if (listOfUpperCase.contains(ch)) {
            return "Character is UpperCase Vowel";
        } else if (listOfLowerCase.contains(ch)) {
            return "Character is LowerCase Vowel";
        }

        return "Character is Not a Vowel";
    }

}

Output :

Enter Character
I
Character is UpperCase Vowel

Enter Character
u
Character is LowerCase Vowel

Enter Character
j
Character is Not a Vowel

Solution Explanation :

• Created two List, and add all upper case vowels into listOfUpperCase and lower case vowels into listOfLowerCase.
• Check if List contains given character character or not. 
• Return answer based on condition.

Solution 2 : Using Switch Case 

import java.util.Scanner;

public class CheckVowelsCase {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Character");
        char ch = sc.next().charAt(0);
        String answer = checkVowels(ch);
        System.out.println(answer);
    }
    
    static String checkVowels(Character ch) {
        switch (ch) {
            case 'A':
            case 'E':
            case 'I':
            case 'O':
            case 'U': return "Character is UpperCase Vowel";
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u': return "Character is LowerCase Vowel";
        }
        return "Character is Not a Vowel";   
    }
}

Other related articles :

• List interface in Java | Guide to ArrayList, LinkedList and Vector Class  
• Divide and compute Modulo of large number  
• Find Numbers with Even Number of Digits in Java