Approach:

Use Collectors.partitioningBy() to separate even and odd numbers into a Map<Boolean, List<Integer>>.

import java.util.*;
import java.util.stream.Collectors;

public class SeparateOddEven {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(10, 21, 32, 43, 54, 65, 76, 87, 98, 109);

        Map<Boolean, List<Integer>> partitioned = numbers.stream()
                .collect(Collectors.partitioningBy(n -> n % 2 == 0));

        List<Integer> evenNumbers = partitioned.get(true);
        List<Integer> oddNumbers = partitioned.get(false);

        System.out.println("Even Numbers: " + evenNumbers);
        System.out.println("Odd Numbers: " + oddNumbers);
    }
}

Output:

Even Numbers: [10, 32, 54, 76, 98]
Odd Numbers: [21, 43, 65, 87, 109]