What is Keywords?
keywords are the reserved words that have predefined meanings and we cannot be used it as identifiers (such as variable names or method names).
Example
int double=10; // we can't use double as variable_name because double is a reserved word.
Java keywords List
abstract assert boolean break byte
case catch char class const
continue default do double else
enum extends final finally float
for goto if implements import
instanceof int interface long native
new package private protected public
return short static strictfp super
switch synchronized this throw throws
transient try void volatile while