Set.of().contains(null)

import java.util.*;

public class NullPointer {
    public static void main(String[] args) {
        Set<Integer> hashSetContainsNull = new HashSet<>();
        hashSetContainsNull.add(null);
        hashSetContainsNull.contains(null);

        // hashSetAllowsNull [null, 1]
        System.out.println("hashSetContainsNull " + hashSetContainsNull);

        Set<Integer> setOfNotContainsNull = Set.of();
        // Even `contains` will throw NullPointerException
        setOf.contains(null);

        // Exception in thread "main" java.lang.NullPointerException
        // at java.base/java.util.Objects.requireNonNull(Objects.java:208)
        // at java.base/java.util.ImmutableCollections$SetN.contains(ImmutableCollections.java:937)
        System.out.println("setOf " + setOfNotContainsNull);
    }
}