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syntactic unit > keyword > extends

extends
subject			fact

extends	if extends is omitted from a class declaration then the class is a subclass of Object class
	has definition A keyword that indicates a class is a subclass of another class or an interface is a subinterface of another interface
	has example //Create a subclass public class MortgageAccount extends Account { // body of the class }
	has purpose to create a subclass
	is a subtopic of Classes
	is an instance of keyword
syntactic unit	has syntax rule bold = mandatory italic = non-terminal normal font = optional