Introduction to Java Programming and Data Structures, Comprehensive Version, Student Value Edition (11th Edition)
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Chapter 13.8, Problem 13.8.1CP
Program Plan Intro

abstract class:

An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.

Legal abstract class:

The conditions for a class to be considered as legal abstract class are mentioned below:

  • If a class includes abstract methods, then the class must be declared as abstract.
  • The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.

Interface:

Interface is a reference type in Java, which contains a collection of abstract methods.

An interface needs to the follow certain conditions such as:

  • One cannot instantiate an interface.
  • Interfaces do not contain any constructors.
  • All methods present in the interface are abstracts.
  • An interface does not contain any instance field.
  • An interface cannot be extended by a class.

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Chapter 13 Solutions

Introduction to Java Programming and Data Structures, Comprehensive Version, Student Value Edition (11th Edition)

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