Example: CountDistinctElementsUsingStreamAPI in Java

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// CountDistinctElementsUsingStreamAPI
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // Step 1: Define the input array
        int[] arr = {10, 20, 10, 30, 40, 20, 50};
        
        // Step 2: Convert the array to an IntStream
        // Step 3: Apply the distinct() operation to get unique elements
        // Step 4: Use count() to get the total number of distinct elements
        long distinctCount = Arrays.stream(arr) // Creates an IntStream from the array
                                .distinct()    // Returns a stream with unique elements
                                .count();      // Counts the elements in the distinct stream
        
        // Step 5: Print the result
        System.out.println("Original Array: " + Arrays.toString(arr));
        System.out.println("Number of distinct elements (Stream API): " + distinctCount);
    }
}