Java / Interface
What is the difference between an Abstract class and Interface?
- Abstract classes may have some executable methods and methods left unimplemented. Interfaces contain no implementation code.
- An class can implement any number of interfaces, but subclass at most one abstract class.
- An abstract class can have non abstract methods. All methods of an interface are abstract.
- An abstract class can have instance variables. An interface cannot.
- An abstract class can define constructor. An interface cannot.
- An abstract class can have any visibility: public, protected, private or none (package). An interface’s visibility must be public or none (package).
- An abstract class inherits from Object and includes methods such as clone() and equals().
Earn bitcoins upto $250 (free), invest in other Cryptocurrencies when you signup with blockfi. Use the referral link: https://blockfi.com/?ref=f2ab78ba
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...