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This module contains review questions and answers keyed to the module titled Java4160: The toArray Method, Part 2.

Revised: Fri Apr 08 13:36:43 CDT 2016

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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 Java4160: The toArray Method, Part 2 .

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.


Question 1 .

True or False? The Collection interface declares the following two versions of the toArray method (with generics syntax omitted because generics is beyond the scope of this course) .

public Object[] toArray()

public Object[] toArray(Object[]a)

Answer 1

Question 2

Write down the output produced by the program shown in Listing 1 .

Answer 2

Question 3

True or False? The Collections class (as opposed to the Collection interface) , provides static methods that operate on collections.

Answer 3

Question 4

True or False? TreeSet is a class in the Java Collections Framework .

Answer 4

Question 5

True or False? A SortedMap is a Map that maintains its entries in ascending order, sorted according to the values'natural ordering, or according to a Comparator provided at the time of the SortedMap creation.

Answer 5

Question 6

True or False? An object of type SortedSet is a Set that, by default, maintains its elements in descending order.

Answer 6

Question 7

True or False? An object of type Map is an object that maps keys to values. Such an object can contain duplicate keys but cannot containduplicate values.

Answer 7

Question 8

True or False? An object of type Deque allows elements to be inserted, retrieved, and removed at both ends.

Answer 8

Question 9

True or False? Objects of type List allow duplicates..

Answer 9

Question 10

True or False? Objects of type Set allow duplicates..

Answer 10

Question 11

True or False? Set is an interface in the Collections Framework .

Answer 11

Question 12

True or False? Collection is the class that forms the root of the Collections Framework hierarchy.

Answer 12



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.

Spacer image of a rabbit and a penguin.

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

Spacer image of a penguin and some houses.


Answer 12

False. Collection is an interface, not a class.

Back to Question 12

Answer 11


Back to Question 11

Answer 10

False. Objects of type Set do not allow duplicates.

Questions & Answers

is economics important in programming world?
Abdul Reply
What is oppunity cost
Kudzanayi Reply
it refers wants that are left unsatisfied in Oder satisfy another more pressing need
Thank bro
is the second altenative to foregone
How does monopoly and imperfect competion;public goods externalities ass symmetric information, ommon property ressourses; income distribution Merit goods and Macroeconomic growth and stability causes market failure?
it is where by a labour moves from one place to another
Amoako Reply
what is mobility of labour
George Reply
who best defined economics
paul Reply
what are the importance of economics
Adwoa Reply
trade should be best
help to know how our government operates in which system
1. To solve economic problems. 2. To predict economic event. 3. It also offer intellectual training to students.
How price elasticity can affect the markets of certain goods
Rhoda Reply
Heyy thanks for the teaching
Easter Reply
what is labour
Arthur Reply
Mental and physical ability of human being is considered as labour.
and usually provided by human
is all human effort both physical and mental abilities to work
why is it that most countries in Africa abuse available resources
Okeoghene Reply
What is economics
Bright Reply
economics is a science which studies human behaviour as a relationship between ends, scarce means which have alternative uses.
Why is scarcity a mind problem in economics
Alima Reply
because of the problem of allocation of resources
unequalled distribution of resources
scarcity is a mind problem due to circumstances like when a particular product is demand in a high rate at the market.
scarcity defines limited in supply relative to the demand them. so scarcity is a mind problem in economics because wants are unlimited while resources are also limited.
it is a mind problem because it's one of the fundamental issue address by economics human wants are unlimited and resources available are limited this makes the study of economics essential
its a fundamental issue
it's not a mind problem, I think it's a economic problem, how to allocate scarce resources to satisfy need and want of society
Identify the different sectors in the economy
Moses Reply
what is economics
economic is study of human behaviour according to how they satisfie their numerous want
Economics is a science which studies human behaviour as a relationship between ends and scares resources.
economic is study of human behaviour according to how they satisfie their numerous want
what is the law of demand
Adugbire Reply
the lower the price the higher the quantity demanded vice versa is true
yes ooh
what are relationship between unemployment and economic growth
Weness Reply
no relationship
When there is economic growth, there is increased opportunity in employment. When there is no economic growth mean there is recession causing a decline or downsizing in employment opportunities.
unemployment or employment determined by the level of economic growth
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