So far, we have been working with a very simple Rectangle class. We created many instances of this class in JShell and we understood how the garbage collection works. Now, it is time to dive deeper into the different members that compose a class in Java 9.
The following list enumerates the most common element types that we can include in a class definition in Java 9. Each member includes its equivalent in other programming languages to make it easy to translate our experience with other object-oriented languages into Java 9. We have already worked with a few of these members:
Constructors: A class might define one or more constructors. They are equivalent to initializers in other programming languages.
Class variables or class fields: These variables are common to all the instances of the class, that is, their value is the same for all the instances. In Java 9, it is possible to access class variables from the class and from its instances. We don't...