What are some examples of using sets in Java?

What are some examples of using sets in Java?

In Java, sets are part of the Collections Framework. They store unique elements. For example, you can use HashSet, TreeSet, or LinkedHashSet.

Can you show me a code example using HashSet?

Sure! Here's a simple example:

import java.util.HashSet;

public class Main {
    public static void main(String[] args) {
        HashSet<String> set = new HashSet<>();
        set.add("Apple");
        set.add("Banana");
        set.add("Orange");
        System.out.println(set);
    }
}

What is the difference between HashSet and TreeSet?

HashSet is unordered and allows null elements, while TreeSet is ordered and does not allow null elements. TreeSet also implements the SortedSet interface.

Can I iterate over a set in Java?

Yes, you can iterate over a set using an enhanced for loop or an iterator. For example:

for (String fruit : set) {
    System.out.println(fruit);
}