Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
Question
Book Icon
Chapter 13.6, Problem 13.6.1CP
Program Plan Intro

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.

Comparable Interface:

  • A comparable interface is a generic interface that defines the compareTo() method that is used for comparing objects.
  • Using comparable interface, one can choose the properties of the objects, rather than the reference location of the objects.

Example:

//java langauage package for comaprable interface

package  java.lang

//comparable interface definition

public interface Comparable <E>

{

//use of compareTo to compare objects

public integer compareTo(E o);

}

Explanation:

The compareTo() method determines the order of this object with the specified object “o” and returns a negative integer, zero or positive integer, if this object is less than, equal to or greater than object “o”.

Blurred answer
Students have asked these similar questions
Define a class method (static) named compare to the Fraction class. The compare method accepts two Fraction objects f1 and f2. The method returns -1 if f1 is less than f2 O if f1 is equal to f2 +1 if f1 is greater than f2
Given a Student class, and UndergradCourse is a true subtype of Course, there is one method called recommend in the Student class:  public class Student {     public Course recommend(Course pCourseID); } Please evaluate if EACH of the method in UndergradStudent class violates the Liskov Substitution Principle. public class UndergradStudent extends Student { 1. public Course recommend(UndergradCourse pCourseID); 2. public UndergradCourse recommend(Course pCourseID); 3. public UndergradCourse recommend(Object pCourseID); 4. public Course recommend(Course pCourseID) throw SomeCheckedException;
What can be said about a class that implements the Comparable interface but does not override the compareTo method? Select one: O The class is invalid. O The class must be abstract. O Objects of the class are not allowed to call compareTo. None of these options

Chapter 13 Solutions

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

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. 13.5.1CPCh. 13.5 - Prob. 13.5.2CPCh. 13.5 - Prob. 13.5.3CPCh. 13.5 - Prob. 13.5.4CPCh. 13.6 - Prob. 13.6.1CPCh. 13.6 - Prob. 13.6.2CPCh. 13.6 - Can the following code be compiled? Why? Integer...Ch. 13.6 - Prob. 13.6.4CPCh. 13.6 - What is wrong in the following code? public class...Ch. 13.6 - Prob. 13.6.6CPCh. 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. 13.7.2CPCh. 13.7 - Show the output of the following code:...Ch. 13.7 - Prob. 13.7.4CPCh. 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. 13.8.1CPCh. 13.8 - Prob. 13.8.2CPCh. 13.8 - Prob. 13.8.3CPCh. 13.9 - Show the output of the following code: Rational r1...Ch. 13.9 - Prob. 13.9.2CPCh. 13.9 - Prob. 13.9.3CPCh. 13.9 - Simplify the code in lines 8285 in Listing 13.13...Ch. 13.9 - Prob. 13.9.5CPCh. 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. 13.6PECh. 13 - (The Colorable interface) Design an interface...Ch. 13 - (Revise the MyStack class) Rewrite the MyStack...Ch. 13 - Prob. 13.9PECh. 13 - Prob. 13.10PECh. 13 - (The Octagon class) Write a class named Octagon...Ch. 13 - Prob. 13.12PECh. 13 - Prob. 13.13PECh. 13 - (Demonstrate the benefits of encapsulation)...Ch. 13 - Prob. 13.15PECh. 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...
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
  • Text book image
    Microsoft Visual C#
    Computer Science
    ISBN:9781337102100
    Author:Joyce, Farrell.
    Publisher:Cengage Learning,
Text book image
Microsoft Visual C#
Computer Science
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Cengage Learning,