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Java Reserved Keywords List You can't use keyword as identifier in your Java programs, its reserved words in Java library and used to perform an internal operation true, false and null are not reserved words but cannot be used as identifiers, because it is literals of builtin typesA Java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes An abstract class can have abstract methods that are not implemented in the abstract class, but in subclassesFeb 28, 05 · In Java, there's the very important keyword extends A class declaration can use the keyword extends on another class, like this class C extends B { } When a class C extends class B, C automatically has all variables and methods defined in class B (except private variable and methods) // example of extending a class class B { int x = 0; This Keyword In Java Javatpoint Final keyword definition in java