In this tutorial we will see how to remove vowels from String in java.
Table of Contents
Using replaceAll() method
We will use String’s replaceAll() method to remove vowels from String.
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import java.util.Scanner; public class StringOperator { public static void main(String args[]) { String str1, str2; Scanner scan = new Scanner(System.in); System.out.print("Enter a String : "); str1 = scan.nextLine(); str2 = str1.replaceAll("[aeiouAEIOU]", ""); System.out.print("All Vowels Removed Successfully..!!\nNew String is : "); System.out.print(str2); } } |
Output:
Enter a String : Java2Blog
All Vowels Removed Successfully..!!
New String is : Jv2Blg
All Vowels Removed Successfully..!!
New String is : Jv2Blg
Explaination
- Take input String from Scanner str1
- Call
replaceAll()method on String to replace[aeiouAEIOU]with empty String"" - Print the result String
str2.
Using iterative method
Here is the program to remove vowels from String without replace() or replaceAll() method.
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package org.arpit.java2blog; import java.util.HashSet; import java.util.Set; public class RemoveVowelsWithoutReplaceAll { public static void main(String[] args) { String str = "Java2Blog"; Set<Character> vowelsSet = new HashSet<>(); vowelsSet.add('A'); vowelsSet.add('E'); vowelsSet.add('I'); vowelsSet.add('O'); vowelsSet.add('U'); vowelsSet.add('a'); vowelsSet.add('e'); vowelsSet.add('i'); vowelsSet.add('o'); vowelsSet.add('u'); StringBuffer resultStr = new StringBuffer(); char[] charArray = str.toCharArray(); for (Character chr : charArray) { if (!vowelsSet.contains(chr)) resultStr.append(chr); } System.out.println("Original String is : " + str); System.out.println("String without vowels is : " + resultStr); } } |
Output:
Original String is : Java2Blog
String without vowels is : Jv2Blg
String without vowels is : Jv2Blg
- Create HashSet named
vowelsSetand add all vowels to it. - Iterate over String
strand check ifvowelsSetdoes not contain the character. - If
vowelsSetdoes not contain the character, then add it to result StringresultStr - Once loop is complete, then print the
resultStr.
That’s all about Java program to remove vowels from String.
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