Capitalize Vowels in a String in Java

 In this tutorial, I will show you how to write a program that will ask the user to give a string or a 

sentence and then the program will capitalize all the vowels in the given string or sentence using Java

programming language.

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Program Listing

import java.util.Scanner;

/**

 * @author Jake Rodriguez Pomperada, MAED-IT, MIT

 * jakerpomperada@gmail.com

 * www.jakerpomperada.com

 * Bacolod City, Negros Occidental

 * November 12, 2020

 */

public class Capitalize_Vowels {

    static final char[] VOWELS = {'a', 'e', 'i', 'o', 'u'};

    

public static void main(String[] args) {

// TODO Auto-generated method stub

      String text;

    

       Scanner keyboard = new Scanner(System.in);

               

      System.out.println("\n");

      System.out.print("\t\tCapitalize Vowels in a String in Java");

      System.out.println("\n");

             

      System.out.print("\tGive a String :  ");

      text = keyboard.nextLine();

      

      char[] result = text.toCharArray();

        for (int i = 0; i < result.length; i++)

        {

            if (isVowel(result[i])) 

            {

                if (isLowerCase(result[i]))

                {

                    result[i] = Character.toUpperCase(result[i]);

                }

            }

        }

        

          System.out.print("\n");

          System.out.println("\tOriginal String   : " + text);

          System.out.print("\tThe result        : " ); 

          System.out.print(result);

      System.out.print("\n\n");

  System.out.println("\tEnd of Program");

  System.out.println("\n\n");

      keyboard.close();

    }

    static boolean isVowel(char ch)

    {

        for (char vowel : VOWELS)

        {

            if (vowel == ch)

            {

                return true;

            }

        }

        return false;

        

        

        

    }

    

    

    

    static boolean isLowerCase(char ch)

    {

        return ch >= 'a' && ch <= 'z';

       

}

}