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Introduction: Welcome to a tutorial on the use of comments within Java. What are comments? Comments are just like the standard definition of comments anywhere in the world, they are used to explain something within the midst of the code. Comments are not read by Java and as such do not affect the program running. When are comments used? Comments are normally used to either make a note for the developer their self so they know where they need to go back to, or bookmark a specific location within a Java file.