Java LinkedHashSet

First things first, it as a blend of a HashSet and a LinkedList—a collection that combines the fast lookup of a HashSet with the predictable iteration order of a LinkedList.

Creation and Basic Operations

Creating a LinkedHashSet is as easy as pie. Just like any other collection, you declare it and start adding elements. But here's the twist—it maintains the order of elements based on their insertion, giving you predictable iteration behavior.

class LinkedHashSetExample{
    // Let's create a LinkedHashSet of fruits
    public static void main(String[] args) {
        LinkedHashSet<String> fruits = new LinkedHashSet<>();

        // Adding some fruits to our set
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");

        // Let's print our fruits
        System.out.println("Fruits in LinkedHashSet: " + fruits);
    }
}

Iteration Order Guarantee

One of the coolest features of LinkedHashSet is its guaranteed iteration order. No matter how many times you iterate over it, you'll always get the elements in the order they were inserted. It's like having your own personal assistant who remembers everything in perfect order!

class LinkedHashSetExample{
    // Let's create a LinkedHashSet of fruits
    public static void main(String[] args) {
        LinkedHashSet<String> fruits = new LinkedHashSet<>();

        // Adding some fruits to our set
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");

        // Let's iterate over our LinkedHashSet
        System.out.println("Iterating over fruits:");
        for (String fruit : fruits) {
            System.out.println(fruit);
        }
    }
}

Removing and Clearing

Removing elements from a LinkedHashSet is a breeze. Whether you want to remove a specific element or clear the whole set, LinkedHashSet makes it simple and efficient.

class LinkedHashSetExample{
    // Let's create a LinkedHashSet of fruits
    public static void main(String[] args) {
        LinkedHashSet<String> fruits = new LinkedHashSet<>();

        // Adding some fruits to our set
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");


// Removing a fruit
        fruits.remove("Banana");
        System.out.println("Fruits after removing Banana: " + fruits);

// Clearing the set
        fruits.clear();
        System.out.println("Fruits after clearing the set: " + fruits);
    }
}

Unique Elements and Performance

Just like HashSet, LinkedHashSet ensures that each element is unique. Plus, it offers fast performance for basic operations like add, remove, and contains. So, you can trust LinkedHashSet to handle your data efficiently, no matter the size.

class LinkedHashSetExample{
    // Let's create a LinkedHashSet of fruits
    public static void main(String[] args) {
        LinkedHashSet<String> fruits = new LinkedHashSet<>();

        // Adding some fruits to our set
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");

        // Adding duplicate elements
        fruits.add("Apple");
        fruits.add("Apple");

// Printing the set
        System.out.println("Fruits after adding duplicates: " + fruits);
    }
}

Use Cases and Practical Examples

LinkedHashSet shines in scenarios where you need both fast lookup and predictable iteration order. Whether you're building a shopping cart, maintaining a user session, or managing a playlist, LinkedHashSet is your go-to choice for maintaining ordered collections efficiently.