Can you explain how the TreeSet data structure is implemented in Java?

TreeSet in Java is implemented based on a red-black tree, which is a balanced binary search tree. This ensures logarithmic time complexity for core operations — adding, removing, and searching for elements.

Implementation features:

• Elements in TreeSet are stored in sorted order, either by natural ordering (via Comparable) or with a provided Comparator.
• Inside TreeSet, a TreeMap is used, where the keys are the set elements, and the values are dummy placeholder objects.
• Thanks to the red-black tree, the structure maintains balance, guaranteeing operational efficiency.

Example of usage:

TreeSet<Integer> set = new TreeSet<>();
set.add(5);
set.add(1);
set.add(3);
System.out.println(set); // Outputs [1, 3, 5]

Thus, TreeSet is an ordered set with efficient access and sorting support.