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Java programming Exercises: Last n vowels of a given string

Java Regular Expression: Exercise-25 with Solution

Write a Java program to get last n vowels of a given string.

Sample Solution:

Java Code:

public class test {
 
   public static void main(String[] args) {	   
	    String text = "Java";
		int n = 2;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		text = "JavaScript";
		n = 2;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		n = 3;
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		text = "SQLite";
		n = 2;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		text = "The quick brown fox jumps over the lazy dog.";
		n = 2;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		n = 3;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));
		n = 15;
		System.out.println("Original String: "+text);
		System.out.println("Last "+ n + " vowels of a given string: "+validate(text,n));		
	}

   public static String validate(String text, int n) {
		String s = text.replaceAll("(?i)[^aeiou]", "");
		int l = s.length();
		return (n > s.length()) ? "Number of vowels mismatch!!!" : s.substring(s.length() - n);
   }
}

Sample Output:

Original String: Java
Last 2 vowels of a given string: aa
Original String: JavaScript
Last 2 vowels of a given string: ai
Last 3 vowels of a given string: aai
Original String: SQLite
Last 2 vowels of a given string: ie
Original String: The quick brown fox jumps over the lazy dog.
Last 2 vowels of a given string: ao
Original String: The quick brown fox jumps over the lazy dog.
Last 3 vowels of a given string: eao
Original String: The quick brown fox jumps over the lazy dog.
Last 15 vowels of a given string: Number of vowels mismatch!!!

Pictorial Presentation:

Java Regular Expression: Last n vowels of a given string.

Flowchart :

Flowchart: Last n vowels of a given string.

Java Code Editor:

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Java: Tips of the Day

Split Java String by New Line

String lines[] = string.split("\\r?\\n");

There's only really two newlines (UNIX and Windows) that you need to worry about.

Ref: https://bit.ly/3dHk7ip