Can a Set allow null values in Java?

Can a Set allow null values in Java?

Yes, in Java, a Set can allow null values. For example, HashSet allows one null value.

Are there any specific types of Sets that do not allow null values?

Yes, for instance, the EnumSet does not allow null values because it is designed to work with enum types.

What happens if I try to add multiple null values to a Set?

If you try to add multiple null values to a Set like HashSet, it will only store one null value since Sets do not allow duplicates.

Can you give me an example of using a Set with null values?

Sure! Here's a simple example:

Set<String> mySet = new HashSet<>();
mySet.add(null);
mySet.add("Hello");
mySet.add(null); // This will not be added again