Computer Science A
  • Introduction
  • Overview
  • Course at a Glance
  • Course Exam and Description
  • Quick Reference Sheet
  • Unit 1 Primitive Types
    • 1.1 Why Programming? Why Java?
    • 1.2 Variables and Data Types
    • 1.3 Expressions and Assignment Statements
    • 1.4 Compound Assignment Operators
    • 1.5 Casting and Ranges of Variables
  • Unit 2 Using Objects
    • 2.1 Objects: Instances of Classes
    • 2.2 Creating and Storing Objects (Instantiation)
    • 2.3 Calling a Void Method
    • 2.4 Calling a Void Method with Parameters
    • 2.5 Calling a Non-void Method
    • 2.6 String Objects: Concatenation, Literals, and More
    • 2.7 String Methods
    • 2.8 Wrapper Classes: Integer and Double
    • 2.9 Using the Math Class
  • Unit 3 Boolean Expressions and if Statements
    • 3.1 Boolean Expressions
    • 3.2 if Statements and Control Flow
    • 3.3 if-else Statements
    • 3.4 else if Statements
    • 3.5 Compound Boolean Expressions
    • 3.6 Equivalent Boolean Expressions
    • 3.7 Comparing Objects
  • Unit 4 Iteration
    • 4.1 while Loops
    • 4.2 for loops
    • 4.3 Developing Algorithms Using Strings
    • 4.4 Nested Iteration
    • 4.5 Informal Code Analysis
  • Unit 5 Writing Classes
    • 5.1 Anatomy of a Class
    • 5.2 Constructors
    • 5.3 Documentation and Comments
    • 5.4 Accessor Methods
    • 5.5 Mutator Methods
    • 5.6 Writing Methods
    • 5.7 Static Variables and Methods
    • 5.8 Scope and Access
    • 5.9 this Keyword
    • 5.10 Ethical and Social Implications of Computing Systems
  • Unit 6 Array
    • 6.1 Array Creation and Access
    • 6.2 Traversing Arrays
    • 6.3 Enhanced for Loop for Arrays
    • 6.4 Developing Algorithms Using Array
  • Unit 7 ArrayList
    • 7.1 Introduction to ArrayList
    • 7.2 ArrayList Methods
    • 7.3 Traversing ArrayLists
    • 7.4 Developing Algorithms Using ArrayLists
    • 7.5 Searching
    • 7.6 Sorting
    • 7.7 Ethical Issues Around Data Collection
  • Unit 8 2D Array
    • 8.1 2D Arrays
    • 8.2 Traversing 2D Arrays
  • Unit 9 Inheritance
    • 9.1 Creating Superclasses and Subclasses
    • 9.2 Writing Constructors for Subclasses
    • 9.3 Overriding Methods
    • 9.4 super Keyword
    • 9.5 Creating References Using Inheritance Hierarchies
    • 9.6 Polymorphism
    • 9.7 Object Superclass
  • Unit 10 Recursion
    • 10.1 Recursion
    • 10.2 Recursive Searching and Sorting
  • Free Response Questions
    • 2021
    • 2022
    • 2023
    • 2024
  • Code
    • Week 1
    • Week 2
    • Week 3
    • Week 4
    • Week 5
    • Week 6
    • Week 7
    • Week 8
    • Week 9
    • Week 10
    • Week 11
    • Week 12
    • Week 13
    • Week 14
    • Week 15
    • Week 16
    • Week 17
    • Week 18
    • Week 19
    • Week 20
    • Week 21
    • Week 22
    • Week 23
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  • Enduring Understanding
  • Learning Objective
  • Essential Knowledge

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  1. Unit 9 Inheritance

9.7 Object Superclass

Enduring Understanding

When multiple classes contain common attributes and behaviors, programmers create a new class containing the shared attributes and behaviors forming a hierarchy. Modifications made at the highest level of the hierarchy apply to the subclasses.

Learning Objective

Call Object class methods through inheritance.

Essential Knowledge

The Object class is the superclass of all other classes in Java.

The Object class is part of the java.lang package

The following Object class methods and constructors—including what they do and when they are used—are part of the Java Quick Reference:

  • boolean equals(Object other)

  • String toString()

Subclasses of Object often override the equals and toString methods with class- specific implementations.

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