The Java Tutorial goes on to list bullets for when an abstract class should be considered and for when an interface should be considered. Unsurprisingly, these are derived from the previously ...

Create packages, import packaged classes and interfaces into your programs, move packages, and encapsulate them in jar files.

Do you need an example of how to use Java's UnaryOperator in a functional Lambda expression? This tutorial shows you where when and how to use the UnaryOperator interface in a function.

Java JOptionPane input example The best way to teach the concept of Java user input to new software developers is to show them how to use the highly visual and user-friendly JOptionPane class from the ...