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:
Flowchart :
Java Code Editor:
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Next: Check whether a given string is a valid hex code or not.What is the difficulty level of this exercise?
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Java: Tips of the Day
What is the best way to filter a Java Collection?
Java 8 (2014) solves this problem using streams and lambdas in one line of code:
List<Person> beerDrinkers = persons.stream() .filter(p -> p.getAge() > 16).collect(Collectors.toList());
Use Collection#removeIf to modify the collection in place. (Notice: In this case, the predicate will remove objects who satisfy the predicate):
persons.removeIf(p -> p.getAge() <= 16);
lambdaj allows filtering collections without writing loops or inner classes:
ListbeerDrinkers = select(persons, having(on(Person.class).getAge(), greaterThan(16)));
Ref: https://bit.ly/3uwYid6
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