java - How to create an object of an abstract class and interface

Question

How do I create an object of an abstract class and interface? I know we can't instantiate an object of an abstract class directly.

Answer 1

You can not instantiate an abstract class or an interface - you can instantiate one of their subclasses/implementers.

Examples of such a thing are typical in the use of Java Collections.

List<String> stringList = new ArrayList<String>();

You are using the interface type List<T> as the type, but the instance itself is an ArrayList<T>.