How do I use LinkedHashSet in Java?

How do I use LinkedHashSet in Java?

A LinkedHashSet in Java is a collection that maintains a linked list of the entries in the set, preserving the order of insertion. You can use it to store unique elements while maintaining their order.

Can you show me a code example?

Sure! Here's a simple example:

import java.util.LinkedHashSet;

public class Main {
    public static void main(String[] args) {
        LinkedHashSet<String> set = new LinkedHashSet<>();
        set.add("Apple");
        set.add("Banana");
        set.add("Cherry");

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

This will print the fruits in the order they were added.

What are the advantages of using LinkedHashSet?

The main advantages of using LinkedHashSet are:

1. It maintains the insertion order of elements.
2. It allows for fast access and retrieval of elements.
3. It does not allow duplicate entries.

Are there any performance considerations I should be aware of?

Yes, while LinkedHashSet provides predictable iteration order, it may have slightly slower performance compared to HashSet due to the overhead of maintaining the linked list. However, it is generally efficient for most use cases.