Java Program To Print Vowels In A String – 2 Simple Programs

In this post, we will see a Java program to print vowels in a String. If a String contains any vowels, then we will display those vowels to the user.

Generally, the English alphabet contains 5 vowels a, e, i, o, and u. In programming also, we will find those vowels and print them. So to do this, we have to write the logic for extracting these literals from a String.

Let’s understand the hidden logic here.

Logic to find vowels in a String

Let’s think.. How we can extract any character from a String in a program?

Simply, we can use charAt( ) method, right? Yes, we can use charAt( ) method.

Ok, the next question is how can we get those characters in a String?  Simply, If we will iterate String in ascending order or descending order, then easily we can find those characters one by one and to iterate we can use any iterative loops like for loop or while loop.

That’s it!

We can print those characters. We got all vowels!

Piece Of Code

Java program to print vowels in a String

Also Read: How to reverse a String in Java – 5 Easy Methods

Algorithm

Accept any String from the user. Convert given String to lowercase String. Start for loop from '0' to str.length( )-1 Declare if condition to check whether the current character is vowel or not Display vowels of given String.
Code language: Java (java)

Program-1: Java Program to print vowels in a String

In this program, we will see how to find vowels in a String. We will use all vowels directly with for loop and if condition to check them.

Let’s see the program now.

package cf.java.string; import java.util.Scanner; public class JavaProgramToPrintVowelsInAString { public static void main(String[] args) { // Declare a variables String str = null; Scanner sc = new Scanner(System.in); // Accept any string from user System.out.print("Enter any String: "); str = sc.nextLine(); // Convert String to lower case letter str = str.toLowerCase(); // Print all vowels System.out.print("Vowels in the given String are:"); // For loop to iterate String for (int i = 0; i < str.length(); i++) { // Check a character is vowel or not if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'u') { // Display each vowel System.out.print(" " + str.charAt(i)); } } } }
Code language: PHP (php)

Output:

Enter any String: Codingface Vowels in the given String are: o i a e
Code language: JavaScript (javascript)

Also Read: Palindrome program in Java for both String and Number.

Program-2: Java Program to count the number of vowels & consonants in a String

In the first program, We have already seen that how we can write a Java program to print vowels in a String. Let’s see another program to count the number of vowels and consonants in a String.

In the below program, we will count both vowels and consonants of String and we will display the count to the user.

package cf.java.string; import java.util.Scanner; public class JavaProgramToCountVowelsAndConsonants { public static void main(String[] args) { // Declare a variables String str = null; int vCount=0,cCount=0; Scanner sc = new Scanner(System.in);; // Accept any string from user System.out.print("Enter any String: "); str = sc.nextLine(); // Convert String to lowercase letter str = str.toLowerCase(); // For loop to iterate String for (int i = 0; i < str.length(); i++) { // Check a character is vowel or not if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'u') { // Increment vowel count by one vCount++; } // Check if character is a consonant or not else if(str.charAt(i)>='a' && str.charAt(i)<='z'){ // Increment consonant count by one cCount++; } } System.out.println("No of vowels given in String: "+vCount); System.out.println("No of consonant given in String: "+cCount); } }
Code language: Java (java)

Output:

Enter any String: Codingface No of vowels given in String: 4 No of consonant given in String: 6
Code language: JavaScript (javascript)

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FAQs

How do you print a vowel in a String?

By using the charAt( ) method and for loop or while loop, we can compare with all vowels i.e. a, e, i, o, u, and when we will find any of them, we can print that vowel.

Can we use the same English alphabet vowels in Java?

Yes, we can use the same 5 English alphabet vowels a, e, i, o, and u in Java also.

Which Iterator we can use to print vowels in a String?

We can use any iterators like for loop or while loop to print vowels in a String.

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