Linked Hashset in Java

Here are some of the key features of LinkedHashSet:

LinkedHashSet is a class in the Java Collections Framework that extends the HashSet class to create an ordered collection of unique elements. Like HashSet, it also uses a hash table data structure to store its elements, but it also maintains a doubly-linked list to keep track of

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1. Uniqueness: LinkedHashSet guarantees that there are no duplicate elements, just like HashSet.
2. Ordering: LinkedHashSet maintains the order in which elements were added to the set. When you iterate over the elements of a LinkedHashSet, you get them in the order in which they were added.
3. Performance: LinkedHashSet offers constant-time performance for adding, removing, and searching for elements on average (assuming a good hash function). However, the actual performance may vary depending on the size of the set and the hash function used.

Here’s an example of how to create a LinkedHashSet, add elements to it, and iterate over the elements:

LinkedHashSet<String> set = new LinkedHashSet<>();

// Adding elements to the set
set.add("apple");
set.add("banana");
set.add("cherry");
set.add("orange");

// Printing out the elements in the set
for (String element : set) {
    System.out.println(element);
}

This will output the following:

apple
banana
cherry
orange

Note that the order of the elements in the LinkedHashSet is the same as the order in which they were added.

Like HashSet, LinkedHashSet is not synchronized, which means that it is not thread-safe. If multiple threads access a LinkedHashSet concurrently and at least one of the threads modifies the set, it must be synchronized externally. You can create a synchronized version of LinkedHa

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Set<String> synchronizedSet = Collections.synchronizedSet(new LinkedHashSet<>());

This will return a thread-safe Set that can be safely accessed by multiple threads.