How to find the pairs of numbers from an array whose sum is divisible by 9 using stream

import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class Divby9PairsUsingStreams {

	public static List<List<Integer>> divBy9Pairs(int[] numArr, Predicate<Integer> div9) {

		System.out.println("The hardcoded array of integers given below");
		Arrays.stream(numArr).forEach(x -> System.out.print(x + " "));
		System.out.println("\nThe pairs of numbers which are divisible by 9");
		/*
		 * Using the nested IntStream (2 levels), flatMap, and filter return list
		 * objects as pairs, the criteria is sum of each pair is divisible by 9
		 */
		return IntStream.range(0, numArr.length).boxed()
				.flatMap(i -> IntStream.range(i + 1, numArr.length)
						.filter(j -> div9.test(numArr[i] + numArr[j]))
						.mapToObj(j -> Arrays.asList(numArr[i], numArr[j])))
				.collect(Collectors.toList());
	}

	public static void main(String[] args) {

		int[] intArr = { 14, 20, 7, 16, 25, 34, 4 };
		System.out.println("OUTPUT:");

		// Calling the function divby9 which computes the sum of pairs divisible by 9
		System.out.println(divBy9Pairs(intArr, (i) -> i % 9 == 0));
	}
}