Java Test 1

Front 1

Comments should

Back 1

be insightful and explain what the instruction's intention is

Front 2

A color image is broken down into individual pixels(points), each of which is represented by

Back 2

3 values denoting the intensity of red, green, and blue in the image

Front 3

In order to be accessible over a computer network, the computer needs its on

Back 3

network address

Front 4

The instruction: System.out.println("Hello World"); might be best commented as

Back 4

//used to demonstrate an output message

Front 5

A URL (Universal Resource Locator) specifies the address of

Back 5

a document or other type of file on the internet

Front 6

For a computer to communicate over the the internet, it must use

Back 6

the combined TCP/IP protocol

Front 7

6 bits can be used to represent ________distinct items or values

Back 7

64

Front 8

A Java program is best classified as:

Back 8

software

Front 9

Java is an example of

Back 9

both high-level language and fourth generation language

Front 10

Consider the following enumeration

enum Speed {FAST, MEDIUM, SLOW} ;

Back 10

The name of the speed enumeration whose ordinal value is zero is FAST

Front 11

If two variables contain aliases of the same object then

Back 11

the object cannot be modified unless there's but a singe reference to it

Front 12

Consider the following two lines of code. What can you say about s1 and s2?

String s1 = "testing" + "123";

String s2 = new String ("testing 123");

Back 12

s1 and s2 are both references to different string objects

Front 13

In Java, "instantiation" means

Back 13

creating a new object of the class

Front 14

In addition to their usage providing a mechanism to convert (to box) primitive data into objects, what else does the wrapper classes provide?

Back 14

static constants

Front 15

An "alias" is when

Back 15

two different reference variables refer to the same physical object

Front 16

An API is

Back 16

an Application Programming Interface

Front 17

In Java a variable may contain

Back 17

a value or a reference

Front 18

Java.text's NumberFormat class includes methods that

Back 18

allow you to format currency, allow you to format percentages, round their display during the formatting process, but not truncate their display during the formatting process

Front 19

Say you write a program that makes use of the Random class, but you fail to include an import statement for java.util.Random (or java.util.*). What will happen when you attempt to compile and run your program.

Back 19

The program won't compile-you'll receive a syntax error about the missing class.

Front 20

Instance data for a Java class

Back 20

may be primitive types or objects

Front 21

An example of passing message to a String where the message has a String parameter would occur in which of the following messages

Back 21

equals

Front 22

To define a class that would represent a car. which of the following definitions is most appropriate

Back 22

public class Car

Front 23

A class constructor usually defines

Back 23

how an object is initialized

Front 24

A variable whose scope is restricted to the method where it was declares is known as a

Back 24

local variable

Front 25

The behavior of a object is defined by the object's

Back 25

methods

Front 26

If a method does not not have a return statement, then

Back 26

it must be a void method

Front 27

Consider a Rational class designed to represent rational numbers as a pair of int's, along with methods reduce (to reduce the rational to simplest form), gcd (to find the greatest common divisor of two int's), as well as methods for addition, subtraction, multiplication, and division. Why should the reduce and gcd methods be declared to be private.

Back 27

Because they will be only be called from methods inside of Rational

Front 28

What happens if you declare a class constructor to have a void return type?

Back 28

You'll likely receive a syntax error