A Reserved word is known as a keyword that is assigned for some internal processes to denote some predefined actions within a programming language. Now within the Java programming language, there are in total 52 keywords or reserved words. And out of those 52 reserved words, 1 is in preview, and 2 are not in use. So, that leaves with 49 keywords in Java. Some of the reserved words within Java are; abstract, break, char, default, extends, final, float, interface, long, return, while, etc.
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