How do I add elements to a Set in Java?

How do I add elements to a Set in Java?

In Java, you can add elements to a Set using the add() method. For example, if you have a HashSet, you can do it like this:

Set<String> mySet = new HashSet<>();
mySet.add("Element1");
mySet.add("Element2");

This will add "Element1" and "Element2" to the Set.

What happens if I try to add a duplicate element?

If you try to add a duplicate element to a Set, it will not be added, and the Set will remain unchanged. Sets do not allow duplicate values.

Can I add elements from another collection?

Yes, you can add all elements from another collection using the addAll() method. For example:

Set<String> anotherSet = new HashSet<>();
anotherSet.addAll(mySet);

This will add all elements from mySet to anotherSet.

Are there different types of Sets in Java?

Yes, Java provides several types of Sets, including HashSet, LinkedHashSet, and TreeSet, each with different characteristics regarding order and performance.