Question 1

What is wrong with the following class definition?
public class Program1
{
public static void main(String[ ] args)
{
System.out.println("My first Java program")
}
}

Accepted Answer

The answer of What is wrong with the following class...

Question 2

Provide a brief explanation of the role of main memory, the control unit, the arithmetic logic unit, and registers. (see figure 1.13)

Accepted Answer

The answer of Provide a brief explanation of the role...

Question 3

Objects are defined by a class that describes the characteristics common to all instances of the class.

Accepted Answer

"An object is an instance of a class." And, the purpose of a class is to describe these common characteristics.

Question 4

Provide a brief description of the roles of the following hardware elements (that is, what each is used for):
a) CPU
b) Main memory
c) Secondary memory devices
d) Input/Output devices

Accepted Answer

The answer of Provide a brief description of the roles...

Question 5

Inheritance is a form of software reuse.

Accepted Answer

Inheritance allows us to capitalize on the similarities among various kinds of classes that have a common base (parent) class. Thus we reuse the base class each time a class inherits from it.

Question 6

Given the following class definition, what are the reserved words and what are the identifiers?
public class Program3
{
public static void main(String[ ] args)
{
System.out.println("My third Java program");
}
}

Accepted Answer

The answer of Given the following class definition, what are...

Question 7

In Java, identifiers may be of any length up to a limit determined by the compiler.

Accepted Answer

Java (and Java compilers) do not limit the length of the identifiers you use. Identifiers may be as long as you wish. Good programming practice, however, will limit the lengths of the identifiers you create.
1.3 Free-Form Questions

Question 8

Polymorphism is the idea that we can refer to multiple types of related objects in consistent ways.

Accepted Answer

Polymorphism allows us to use the same name for similar behaviors that occur among diverse and possibly unrelated objects. For example, to "open" may refer to a file, or to a device, or to a communications line, etc. The same term, "open," is being usedeven though the objects that are being opened are quite different.

Question 9

Examine figure 1.7 before answering this question. What 8-bit value comes immediately before and what 8-bit value comes immediately after 10010111?

Accepted Answer

The answer of Examine figure 1.7 before answering this question....

Question 10

Rewrite the following comment so that it can appear over multiple lines.
// This is one really enormously long comment that might run off the page

Accepted Answer

The answer of Rewrite the following comment so that it...

Question 11

During translation, the compiler puts its output (the compiled Java program) into ROM.

Accepted Answer

ROM stands for read-only-memory. The compiled output (the byte codes) may be placed into RAM (writable random access memory) or into a file (on your hard drive, for example).

Question 12

Provide identifier names that would be used to represent a person's social security number, income tax withheld, and net pay.

Accepted Answer

The answer of Provide identifier names that would be used...

Question 13

What is wrong with the following println statement?
System.out.println("My fourth Java Program);

Accepted Answer

The answer of What is wrong with the following println...

Question 14

There are a number of reserved words in Java that have no current meaning (denoted with an * in figure 1.18). Why?

Accepted Answer

The answer of There are a number of reserved words...

Question 15

In a Java program, dividing by 0 is a syntax error.

Accepted Answer

Dividing by 0 is not detected at compile time, and because a computer cannot divide by 0, this is a run-time error.

Question 16

What is the output of the following when the main method is executed?
public class Question4
{
public static void main(String[ ] args)
{
System.out.println("hi there");
System.out.println(" ");
System.out.println("how are you doing today?
 ");
}
}

Accepted Answer

The answer of What is the output of the following...

Question 17

Rewrite the following program with better formatting to make it easier to read.
public
class
MyProgram
{ public static void
main(
String[ ]
args)
{ System.out.println(
"Wow, this is messed up!"
);
} }

Accepted Answer

The answer of Rewrite the following program with better formatting...

Question 18

Reserved words in Java can be redefined by the programmer to mean something other than their original intentions.

Accepted Answer

Java reserved words cannot be redefined.

Question 19

A document of text is 15 pages long. Each page contains approximately 200 words and the average length of each word is 5 characters. Also assume one blank space between each word and no punctuation. How many bytes will it take to store this document in memory or on disk using ASCII?

Accepted Answer

The answer of A document of text is 15 pages...

Question 20

What is wrong with the following class definition?
public class Program2
public static void main(String[ ] args)
{
System.out.println("My second Java program");
}

Accepted Answer

The answer of What is wrong with the following class...

Quiz 1: Introduction

What is wrong with the following class definition? public class Program1 { public static void main(String[ ] args) { System.out.println("My first Java program") } }

Provide a brief explanation of the role of main memory, the control unit, the arithmetic logic unit, and registers. (see figure 1.13)

Objects are defined by a class that describes the characteristics common to all instances of the class.

Provide a brief description of the roles of the following hardware elements (that is, what each is used for): a) CPU b) Main memory c) Secondary memory devices d) Input/Output devices

Inheritance is a form of software reuse.

Given the following class definition, what are the reserved words and what are the identifiers? public class Program3 { public static void main(String[ ] args) { System.out.println("My third Java program"); } }

In Java, identifiers may be of any length up to a limit determined by the compiler.

Polymorphism is the idea that we can refer to multiple types of related objects in consistent ways.

Examine figure 1.7 before answering this question. What 8-bit value comes immediately before and what 8-bit value comes immediately after 10010111?

Rewrite the following comment so that it can appear over multiple lines. // This is one really enormously long comment that might run off the page

During translation, the compiler puts its output (the compiled Java program) into ROM.

Provide identifier names that would be used to represent a person's social security number, income tax withheld, and net pay.

What is wrong with the following println statement? System.out.println("My fourth Java Program);

There are a number of reserved words in Java that have no current meaning (denoted with an * in figure 1.18). Why?

In a Java program, dividing by 0 is a syntax error.

What is the output of the following when the main method is executed? public class Question4 { public static void main(String[ ] args) { System.out.println("hi there"); System.out.println(" "); System.out.println("how are you doing today? "); } }

Rewrite the following program with better formatting to make it easier to read. public class MyProgram { public static void main( String[ ] args) { System.out.println( "Wow, this is messed up!" ); } }

Reserved words in Java can be redefined by the programmer to mean something other than their original intentions.

A document of text is 15 pages long. Each page contains approximately 200 words and the average length of each word is 5 characters. Also assume one blank space between each word and no punctuation. How many bytes will it take to store this document in memory or on disk using ASCII?

What is wrong with the following class definition? public class Program2 public static void main(String[ ] args) { System.out.println("My second Java program"); }