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import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);

        Map<String, List<Integer>> groupedNumbers = numbers.stream()
                .collect(Collectors.groupingBy(number -> number % 2 == 0 ? "Even" : "Odd"));

        System.out.println(groupedNumbers);
    }
}

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{Even=[2, 4, 6, 8], Odd=[1, 3, 5, 7, 9]}

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