In this post, we will see how to find and count vowels in a string.
Find Vowels in a String
If any character in String satisfy below condition then it is vowel and we will add it to Hashset.
character==’a’ || character==’A’ || character==’e’ || character==’E’ ||
character==’i’ || character==’I’ || character==’o’ || character==’O’ ||
character==’u’ || character==’U’
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package org.arpit.java2blog; import java.util.HashSet; import java.util.Scanner; import java.util.Set; public class VowelFinder { public static void main(String args[]) { Scanner scanner = new Scanner(System.in); System.out.print("Enter an String : "); String str = scanner.next(); Set<Character> set=new HashSet<Character>(); for (int i = 0; i < str.length(); i++) { char c=str.charAt(i); if(isVowel(c)) { set.add(c); } } System.out.println("Vowels are:"); for (Character c:set) { System.out.print(" "+c); } scanner.close(); } public static boolean isVowel(char character) { if(character=='a' || character=='A' || character=='e' || character=='E' || character=='i' || character=='I' || character=='o' || character=='O' || character=='u' || character=='U'){ return true; }else{ return false; } } } |
Output:
Enter an String : Java2blog
Vowels are:
a o
Explanation
- Iterate over String
str and check each Character is vowel or not based on below condition
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if(character=='a' || character=='A' || character=='e' || character=='E' || character=='i' || character=='I' || character=='o' || character=='O' || character=='u' || character=='U') |
- If it is vowel, then print the vowel
Count number of Vowels in the String
Here is the program to count number of Vowels in the String.
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package org.arpit.java2blog; import java.util.Scanner; public class VowelCounter { public static void main(String args[]) { Scanner scanner = new Scanner(System.in); System.out.print("Enter an String : "); String str = scanner.next(); int countVowels = countVowels(str); System.out.println("Number of vowels: "+countVowels); scanner.close(); } public static int countVowels(String str) { int count = 0; for (int i = 0; i < str.length(); i++) { char character =str.charAt(i); if(character=='a' || character=='A' || character=='e' || character=='E' || character=='i' || character=='I' || character=='o' || character=='O' || character=='u' || character=='U'){ count++; } } return count; } } |
Output:
Enter an String : Java2blog
Number of vowels: 3
Explanation
- Declare
count variable and initialize it with 0.
- Iterate over String
str and check each Character is vowel or not based on below condition
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if(character=='a' || character=='A' || character=='e' || character=='E' || character=='i' || character=='I' || character=='o' || character=='O' || character=='u' || character=='U') |
- If it is vowel, then increment the
count
- Once loop is complete, then return the
count.
That’s all about how to find vowels in a string in java.
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