savitchAbsJavaPPT_c07课件.ppt

Chapter 7;Introduction to Inheritance;Introduction to Inheritance;Derived Classes;Derived Classes;Derived Classes;A Class Hierarchy;Derived Classes;Derived Classes;Derived Classes;Derived Class (Subclass);Inherited Members;Parent and Child Classes;Overriding a Method Definition;Changing the Return Type of an Overridden Method;Covariant Return Type;Changing the Access Permission of an Overridden Method;Changing the Access Permission of an Overridden Method;Pitfall: Overriding Versus Overloading;The final Modifier;The super Constructor;The super Constructor;The super Constructor;The this Constructor;The this Constructor;The this Constructor;Tip: An Object of a Derived Class Has More than One Type;Tip: An Object of a Derived Class Has More than One Type;Pitfall: The Terms Subclass and Superclass;An Enhanced StringTokenizer Class;An Enhanced StringTokenizer Class;An Enhanced StringTokenizer Class(Part 1 of 4);An Enhanced StringTokenizer Class(Part 2 of 4);An Enhanced StringTokenizer Class(Part 3 of 4);An Enhanced StringTokenizer Class(Part 4 of 4);Encapsulation and Inheritance Pitfall: Use of Private Instance Variables from the Base Class;Encapsulation and Inheritance Pitfall: Use of Private Instance Variables from the Base Class;Pitfall: Private Methods Are Effectively Not Inherited;Protected and Package Access;Protected and Package Access;Protected and Package Access;Access Modifiers;Pitfall: Forgetting About the Default Package;Pitfall: A Restriction on Protected Access;Pitfall: A Restriction on Protected Access;Tip: Is a Versus Has a;Tip: Is a Versus Has a;Tip: Is a Versus Has a;Tip: Static Variables Are Inherited;Access to a Redefined Base Method;You Cannot Use Multiple supers;The Class Object;The Class Object;The Class Object;The Right Way to Define equals;The Right Way to Define equals;A Better equals Method for the Class Employee;Tip: getClass Versus instanceof;Tip: getClass Versus instanceof;Tip: getClass Versus instanceof;instanceof and getCl