2.30 Jb0240r review

Revised: Mon Mar 28 16:31:25 CDT 2016

This page is included in the following Books:

• Programming Fundamentals with Java
• Object-Oriented Programming (OOP) with Java

Table of contents

• Preface
• Questions
  • 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18
• Listings
• Answers
• Miscellaneous

Preface

This module contains review questions and answers keyed to the module titled Jb0240: Java OOP: Arrays and Strings .

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

Questions

Question 1 .

True or false? Arrays and Strings are true objects. If false, explain why.

Answer 1

Question 2

True or false? It is easy to write outsides the bounds of a String or an array. If false, explain why.

Answer 2

Question 3

You must declare a variable capable of holding a reference to an array object before you can use it. In declaring the variable, you must provide two importantpieces of information. What are they?

Answer 3

Question 4

Provide code fragments that illustrate the two different syntaxes that can be used to declare a variable capable of holding a reference to an array objectthat will store data of type int.

Answer 4

Question 5

True or false? When you declare a variable capable of holding a reference to an array object, the memory required to contain the array object is automaticallyallocated. If false, explain why and show how memory can be allocated.

Answer 5

Question 6

True or false? It is required that you simultaneously declare the name of the variable and cause memory to be allocated to contain the array object in a singlestatement. If false, explain why and show code fragments to illustrate your answer.

Answer 6

Question 7

True or false? Array indices always begin with 1. If false, explain why.

Answer 7

Question 8

What is the name of the property of arrays that can be accessed to determine the number of elements in the array? Provide a sample code fragment thatillustrates the use of this property.

Answer 8

Question 9

What types of data can be stored in array objects?

Answer 9

Question 10

True or false? Just as in other languages, when you create a multi-dimensional array, the secondary arrays must all be of the same size. Iffalse, explain your answer. Then provide a code fragment that illustrates your answer or refer to a sample program in Jb0240: Java OOP: Arrays and Strings that illustrates your answer.

Answer 10

Question 11

True or false? Just as in other languages, when declaring a two-dimensional array, it is necessary to declare the size of the secondary dimension when thearray is declared. If false, explain your answer. Then provide a code fragment that illustrates your answer or refer to a sample program in Jb0240: Java OOP: Arrays and Strings that illustrates your answer.

Answer 11

Question 12

True or false? Java allows you to assign one array to another. Explain what happens when you do this. Then provide a code fragment that illustrates youranswer or refer to a sample program in Jb0240: Java OOP: Arrays and Strings that illustrates your answer.