AP Computer Science A Notes:

Inheritance defines a relationship between _______ that share characteristics

objects

Inheritance is when a new class (_______) is created from an existing class (_______)

subclass, superclass

The subclass _______ characteristics of its superclass

inherits

When methods of superclasses are overwritten by subclasses

Method overriding

If part of the original method implementation from the superclass is retained, the rewrite is

referred to as _______

Partial overriding

Interfaces are implemented using what keyword?

Implements

True or false: A class that extends a superclass can also implement an interface.

true

When a class extends a superclass AND implements an interface, which clause comes first?

the extends clause

True or false: A class can have just one superclass.

True

True or false: A class can only have one interface.

False

An (interface/abstract class) typically does NOT provide implementations for any of its methods,

while an (interface/abstract class) can.

interface; abstract class

What methods of Object are important to know? (2)

toString; equals

What does the default toString() return?

the class name, an @, and the memory address of the object

Why should you redefine the toString method for all of your classes?

AP Computer Science A Notes

Unit 9: Inheritance