In this level, you learned how to create your own methods and pass arguments to them. We also figured out what these public, protected, and private keywords mean before each method.
Everything seems clear and understandable enough, but if you have a desire to dig a little deeper in order to avoid confusion in the future, use this supplementary article: Access modifiers: private, protected, default, public.
To revisit information about variables and their special features, check out Java magic: declaring and initializing variables.
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