Codes

[siddharthrgade21-a11y]

import java.util.;
import java.util.concurrent.;
import java.util.stream.Collectors;

public class AdvancedDataProcessor {

public static void main(String[] args) {
    // Sample list of strings, including some null and empty values
    List<String> rawData = Arrays.asList("Java", "Advanced", null, "Concurrency", "", "Streams", "Optional");

    // Using CompletableFuture for asynchronous execution
    CompletableFuture.supplyAsync(() -> processData(rawData))
        .thenAccept(result -> {
            System.out.println("Processing Complete!");
            result.forEach(System.out::println);
        })
        .exceptionally(ex -> {
            System.err.println("Error occurred: " + ex.getMessage());
            return null;
        })
        .join(); // Wait for completion (for demo purposes)
}

/**
 * Processes a list of strings: filters out nulls/empties, 
 * converts to uppercase, and sorts alphabetically.
 */
public static List<String> processData(List<String> data) {
    return Optional.ofNullable(data)
        .orElseGet(Collections::emptyList)
        .stream()
        // Filter: Remove nulls and empty strings
        .filter(str -> str != null && !str.isBlank())
        // Map: Transform to uppercase
        .map(String::toUpperCase)
        // Sort: Natural alphabetical order
        .sorted()
        // Collect into a new List
        .collect(Collectors.toList());
}

}