Java 8 – Parallel Stream of List of Method Parameters

I have a method:

invokList(List<Object> list);

This method is inside a jar and I have no access to the source code of it. So for that, I need to execute the invokList in a parallel way, can someone help for this?

The idea is to split the list to many lists and execute invokList in parallel.

I have made this example:

            import java.util.Arrays;
            import java.util.Collections;
            import java.util.List;

            public class Test {

                public static void main(String[] args) {
                    List<Integer> list = Arrays.asList(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20);
                    list.parallelStream()
                            .map(Collections::singletonList)
                            .forEach(Test::invokList);
                }

                public static void invokList(List<Integer> list) {
                    try {
                        Thread.sleep(100);
                        System.out.println("The Thread :" + Thread.currentThread().getName() + " is processing this list" + list);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }