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

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 eCode 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: 6Code language: JavaScript (javascript)

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