4.25 Java4130r: review

Revised: Fri Apr 08 10:56:41 CDT 2016

This page is included in the following Books:

• ITSE 2321 - Object-Oriented Programming (Java)
• Object-Oriented Programming (OOP) with Java

Table of contents

• Preface
• Questions
  • 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10
• Listings
• Answers
• Complete program listing
• Miscellaneous

Preface

This module is one in a collection of modules on Java Collections designed for teaching ITSE2321 - Object-Oriented Programming (Java) at Austin Community College in Austin, TX.

This module contains review questions and answers keyed to the module titled Java4130: The Comparator Interface, Part 5 .

Once you study that module, you should be able to answer the review questions in this module.

The questions and the answers in this module are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

Questions

Question 1 .

What output is produced by the program shown in Listing 1 ?

• Compiler Error
• Runtime Error
• BILL Bill JOE Joe TOM Tom
• Tom TOM Joe JOE Bill BILL
• Joe Bill Tom
• None of the above.

Answer 1

Question 2

True or False? The LinkedList class implements the Collection interface and the List interface.

Answer 2

Question 3

True or False? Collections is an interface and Collection is a class.

Answer 3

Question 4

True or False? The Collections class consists exclusively of static methods that operate on or return collections.

Answer 4

Question 5

True or False? The sort method of the Collections class, along with a Comparator object can be used to sort the contents of a list according to the rules programmed into the Comparator object.

Answer 5

Question 6

True or False? The Collections class provides a large number of very interesting and useful methods, such as sort , ternarySearch , copy , reverse , and reverseOrder .

Answer 6

Question 7

True or False? The sort method of the Collections class is an instance (non-static) method.

Answer 7

Question 8

True or False? The sort method of the Collections class can be used without a Comparator object to sort a list into descending order according to the natural ordering of its elements.

Answer 8

Question 9

True or False? The sort method of the Collections class uses an array as an intermediary in the sorting process.

Answer 9

Question 10

True or False? The rules programmed into the compare method of the class named TheComparator in Listing 1 produces a sort order of ascending natural order when used with the sort method of the Collections class to sort the contents of a list.

Answer 10

Listings

• Listing 1 . Comparator06.java.

What is the meaning of the following two images?

These images were inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Answers

Answer 10

False. The rules programmed into the compare method of the class named TheComparator in Listing 1 produces a sort order of descending natural order when used with the sort method of the Collections class to sort the contents of a list.