Example: Remove Vowels using Java 8 Streams in Java

// Remove Vowels using Java 8 Streams
import java.util.Scanner;
import java.util.stream.Collectors;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Define the input string
        String originalString = "Stream API Example";
        System.out.println("Original String: " + originalString);

        // Step 2: Define a string containing all vowels for quick lookup
        String vowels = "aeiouAEIOU";

        // Step 3: Convert the string to a stream of characters, filter, and collect
        String stringWithoutVowels = originalString.chars() // Gets an IntStream of char values (int)
            .filter(c -> vowels.indexOf(c) == -1) // Filters out characters that are found in the 'vowels' string
            .mapToObj(c -> String.valueOf((char) c)) // Converts each int (char value) back to a String object
            .collect(Collectors.joining()); // Joins the filtered String objects into a single string

        // Step 4: Print the result
        System.out.println("String without Vowels: " + stringWithoutVowels);

        // Example with user input
        Scanner scanner = new Scanner(System.in);
        System.out.print("\nEnter another string: ");
        String userInput = scanner.nextLine();
        String processedInput = userInput.chars()
            .filter(c -> vowels.indexOf(c) == -1)
            .mapToObj(c -> String.valueOf((char) c))
            .collect(Collectors.joining());
        System.out.println("Processed String: " + processedInput);
        scanner.close();
    }
}