Java / Set and its implementations
Difference between HashSet and TreeSet in Java.
HashSet stores the object in random order. There is no guarantee that the element we inserted first in the HashSet will be printed first in the output . TreeSet maintains the elements in sorted order.
HashSet can store null object while TreeSet does not allow null object. If one try to store null object in TreeSet object , it will throw NullPointerException.
HashSet are internally backed by hashmap. While TreeSet is backed by a Navigable TreeMap.
HashSet take constant time performance for the basic operations like add, remove contains and size.While TreeSet guarantees log(n) time cost for the basic operations (add,remove,contains).
Dogecoin! Earn free bitcoins up to $250 now by signing up.
Earn bitcoins upto $250 (free), invest in other Cryptocurrencies when you signup with blockfi. Use the referral link: Signup now and earn!
Using BlockFi, don't just buy crypto - start earning on it. Open an interest account with up to 8.6% APY, trade currencies, or borrow money without selling your assets.
Invest now!!! Get Free equity stock (US, UK only)!
Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.
The Robinhood app makes it easy to trade stocks, crypto and more.
More Related questions...