Java contains 53 reserved words out of which 50 are keywords.
Out of 50, only 48 keywords are used and two keywords const and goto are not in use, and 3 are literals values true
These reserved words can not be used as identifiers.
The keyword is a reserved word that has a predefined meaning in the language, therefore, we cannot use keywords as names as a class, methods, variable names, or as any other identifier. Keywords of java are:
const and goto are not in use
strictfp added in jdk 1.2
enum added in jdk 1.5