JDK 1.7 release had introduced several useful features, despite most of them being syntactic sugar, there use can greatly improve readability and code quality. One of such feature is introduction of underscore in numeric literals. From Java 7 onwards you can write a long digit e.g. 10000000000 to a more readable 10_000_000_000 in your Java source code. One of the most important reason of using underscore in numeric literal is avoiding subtle mistakes which is hard to figure out by looking at code. It's hard to notice a missing zero or extra zero between 10000000000 and 1000000000, than 10_000_000_000 and 1_000_000_000. So if you are dealing with big numbers in Java source code, use underscore in numbers to improve readability. By the way, there are rules to use underscore in numeric literals, as they are also a valid character in identifier, you can only use them in between digits, precisely neither at the start of numeric literal nor at the end of numeric literals. In next couple of section, we will learn how underscore in numeric literal is implemented and rules to use them in numerical literals.
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