Interfaces are Java's most powerful polymorphism tool. A reference of interface type can hold any object that implements it, and method calls are dispatched dynamically to the actual implementation. This enables the Strategy, Observer, and many other patterns.
Interface as a Polymorphic Type
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.