When default methods were introduced in Java 8, some developers thought they would be the same as abstract classes. That’s not true, however, because interfaces can’t have state.

An abstract class in Java is a class that cannot be instantiated and is intended to be subclassed by other classes. Abstract classes can contain abstract methods, which are methods that are declared ...

Fork this repo. Clone this repo. Add your instructor and the class graders as collaborators to your repository. If you are unsure who your class graders are, ask your instructor or refer to the day 1 ...

Using an anonymous class to pass functionality as a method argument (Comparer.java) public abstract class Comparer { public abstract int compare(int x, int y); } ...