Superclasses and subclasses Is a?" Relationship oObject"is an object of another class o Rectangle"is a quadrilateral Class Rectangle inherits from class Quadrilateral O Form tree-like hierarchical structures hyperclass Subc lasses Student Graduatestudent UndergraduateStudent Shape Circle Triangle Rectangle L。an Carload HomeImprovementLoan M。 tracer。ar Employee Facul tyMember sta￡ Member ACcount CheckingAccount SavingsAccount ig.9.1 Some simple inheritanc e examp les in whic h the subc lass" is a"superclassLiang,Introduction to Java Programming,revised by Dai-kaiyu 6 Superclasses and Subclasses ⚫“Is a” Relationship Object “is an” object of another class ⚫Rectangle “is a” quadrilateral • Class Rectangle inherits from class Quadrilateral Form tree-like hierarchical structures