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.

Similarities between abstract classes and interfaces:

Some of the similarities between abstract classes and interfaces are mentioned below:

One cannot create objects for both abstract classes and interfaces.

All the abstract methods must be overridden by the sub class in both interfaces and interfaces.

One can create reference variables for both abstract classes and interfaces...

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Chapter 13.8, Problem 13.8.1CP

Chapter 13.8, Problem 13.8.3CP

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Chapter 13 Solutions

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

Ch. 13.2 - Prob. 13.2.1CP Ch. 13.2 - The getArea() and getPerimeter() methods may be...Ch. 13.2 - True or false? a.An abstract class can be used...Ch. 13.3 - Prob. 13.3.1CP Ch. 13.3 - Prob. 13.3.2CP Ch. 13.3 - Prob. 13.3.3CP Ch. 13.3 - What is wrong in the following code? (Note the...Ch. 13.3 - What is wrong in the following code? public class...Ch. 13.4 - Can you create a Calendar object using the...Ch. 13.4 - Prob. 13.4.2CP

Ch. 13.4 - How do you create a Calendar object for the...Ch. 13.4 - For a Calendar object c, how do you get its year,...Ch. 13.5 - Prob. 13.5.1CP Ch. 13.5 - Prob. 13.5.2CP Ch. 13.5 - Prob. 13.5.3CP Ch. 13.5 - Prob. 13.5.4CP Ch. 13.6 - Prob. 13.6.1CP Ch. 13.6 - Prob. 13.6.2CP Ch. 13.6 - Can the following code be compiled? Why? Integer...Ch. 13.6 - Prob. 13.6.4CP Ch. 13.6 - What is wrong in the following code? public class...Ch. 13.6 - Prob. 13.6.6CP Ch. 13.6 - Listing 13.5 has an error. If you add list.add...Ch. 13.7 - Can a class invoke the super.clone() when...Ch. 13.7 - Prob. 13.7.2CP Ch. 13.7 - Show the output of the following code:...Ch. 13.7 - Prob. 13.7.4CP Ch. 13.7 - What is wrong in the following code? public class...Ch. 13.7 - Show the output of the following code: public...Ch. 13.8 - Prob. 13.8.1CP Ch. 13.8 - Prob. 13.8.2CP Ch. 13.8 - Prob. 13.8.3CP Ch. 13.9 - Show the output of the following code: Rational r1...Ch. 13.9 - Prob. 13.9.2CP Ch. 13.9 - Prob. 13.9.3CP Ch. 13.9 - Simplify the code in lines 8285 in Listing 13.13...Ch. 13.9 - Prob. 13.9.5CP Ch. 13.9 - The preceding question shows a bug in the toString...Ch. 13.10 - Describe class-design guidelines.Ch. 13 - (Triangle class) Design a new Triangle class that...Ch. 13 - (Shuffle ArrayList) Write the following method...Ch. 13 - (Sort ArrayList) Write the following method that...Ch. 13 - (Display calendars) Rewrite the PrintCalendar...Ch. 13 - (Enable GeometricObject comparable) Modify the...Ch. 13 - Prob. 13.6PE Ch. 13 - (The Colorable interface) Design an interface...Ch. 13 - (Revise the MyStack class) Rewrite the MyStack...Ch. 13 - Prob. 13.9PE Ch. 13 - Prob. 13.10PE Ch. 13 - (The Octagon class) Write a class named Octagon...Ch. 13 - Prob. 13.12PE Ch. 13 - Prob. 13.13PE Ch. 13 - (Demonstrate the benefits of encapsulation)...Ch. 13 - Prob. 13.15PE Ch. 13 - (Math: The Complex class) A complex number is a...Ch. 13 - (Use the Rational class) Write a program that...Ch. 13 - (Convert decimals to fractious) Write a program...Ch. 13 - (Algebra: solve quadratic equations) Rewrite...Ch. 13 - (Algebra: vertex form equations) The equation of a...

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