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Quiz by Heather Williams, created more than 1 year ago

Computer Science Quiz on Java (Ch 1 - Ch 7), created by Heather Williams on 06/23/2018.

222

	Created by Heather Williams about 6 years ago

Java (Ch 1 - Ch 7)

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Question 1 of 100

Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?

Select one of the following:

PrintWriter outfile = new PrintWriter("MyFile.txt", true);
PrintWriter outfile = new PrintWriter(true, "MyFile.txt");
FileWriter fwriter = new FileWriter("MyFile.txt");
PrintWriter outFile = new PrintWriter(fwriter);
FileWriter fwriter = new FileWriter("MyFile.txt", true);
PrintWriter outFile = new PrintWriter(fwriter);

Explanation

Question 2 of 100

When an object is created, the attributes associated with the object are called

Select one of the following:

instance fields
fixed attributes
instance methods
class instances

Explanation

Question 3 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 4 of 100

Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8%?

Select one of the following:

"###.##%"
"#0.00%"
"##0.0%"
"000.0%"

Explanation

Question 5 of 100

Given the following statement, which statement will write the string "Calvin" to the file DiskFile.txt?

Select one of the following:

PrintWriter.println("Calvin");
diskOut.println("Calvin");
System.out.println(diskOut, "Calvin");
DiskFile.println("Calvin");

Explanation

Question 6 of 100

What would be the value of discountRate after the following statements are executed?

Select one of the following:

0.03
0.0
0.01
0.05

Explanation

Question 7 of 100

The ________ is ideal in situations where the exact number of iterations is known.

Select one of the following:

posttest loop
while loop
do-while loop
for loop

Explanation

Question 8 of 100

What will be the result of executing the following code?

Select one of the following:

The variable x will contain the values 0 through 5.
An array of 6 values, all initialized to 0 and referenced by the variable x, will be created.
A compiler error will occur.
An array of 6 values, ranging from 0 through 5 and referenced by the variable x, will be created.

Explanation

Question 9 of 100

What will be displayed when the following code is executed?

Select one of the following:

45678.259
45,678.26
0,045,678.26
45,678.3

Explanation

Question 10 of 100

What will be the value of bonus after the following code is executed?

Select one of the following:

1000
500
1250
750

Explanation

Question 11 of 100

In an if-else statement, if the boolean expression is false

Select one of the following:

no statements or blocks are executed.
the statement or block following the else is executed.
the first statement or block is executed.
all statements or blocks are executed.

Explanation

Question 12 of 100

Assume that inputFile references a Scanner object that was used to open a file. Which of the
following while loops shows the correct way to read data from the file until the end of the file is
reached?

Select one of the following:

while (inputFile.hasNext())
while (!inputFile.EOF)
while (inputFile.nextLine == " ")
while (inputFile != null)

Explanation

Question 13 of 100

What would be the value of discountRate after the following statements are executed?

Select one of the following:

0.04
0.0
0.03
0.05

Explanation

Question 14 of 100

A ________ is a boolean variable that signals when some condition exists in the program.

Select one of the following:

flag
block
case
sentinel

Explanation

Question 15 of 100

You should not define a class field that is dependent upon the values of other class fields

Select one of the following:

in order to avoid having stale data.
because it should be defined in another class.
in order to keep it current.
because it is redundant.

Explanation

Question 16 of 100

Variables are classified according to their

Select one of the following:

values
data type
names
location in memory.

Explanation

Question 17 of 100

A class that is defined inside of another class is called a(n)

Select one of the following:

inner class
helper class
nested class
enumerated class

Explanation

Question 18 of 100

Because Java byte code is the same on all computers, compiled Java programs

Select one of the following:

must be re-compiled for each different machine it is run on.
cannot run on computers with different operating systems.
are highly portable.
are non-existent.

Explanation

Question 19 of 100

Java requires that the boolean expression being tested by an if statement be enclosed in

Select one of the following:

a set of double quotes.
a set of brackets.
a set of braces.
a set of parentheses.

Explanation

Question 20 of 100

The scope of a local variable is

Select one of the following:

the entire class.
inside the parentheses of a method header.
the method in which they are defined.
inside the class, but not inside any method.

Explanation

Question 21 of 100

What will be returned from the method, if the following is the method header?

Select one of the following:

the address of an object of the Rectangle class
the values stored in the data members of the Rectangle object
a null value
an object that is contained in the class Rectangle

Explanation

Question 22 of 100

How many bits are in a byte?

Select one of the following:

Explanation

Question 23 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 24 of 100

If you do not provide initialization values for a class's numeric fields, they will

Select one of the following:

cause a runtime error.
contain an unknown value.
cause a compiler error.
be automatically initialized with 0.

Explanation

Question 25 of 100

________ operators are used to determine whether a specific relationship exists between two
values.

Select one of the following:

Relational
Arithmetic
Logical
Assignment

Explanation

Question 26 of 100

Using a counter-controlled while loop, write Java code to compute the sum of the integers from 1
to 100, inclusively, and output that result to the console. You will declare the integer variable num
to count the number of executions (in the counter-controlled loop) and initialize it to 1. You will
also declare the integer variable sum to store your computation result and initialize it to 0. Be sure
to print your result to the console.

Select one of the following:

True
False

Explanation

Question 27 of 100

How many times will the following for loop be executed?

Select one of the following:

Explanation

Question 28 of 100

This type of loop will always be executed at least once.

Select one of the following:

pretest
posttest
infinite
conditional

Explanation

Question 29 of 100

Before entering a loop to compute a running total, the program should first

Select one of the following:

know exactly how many values there are to total.
set all variables to zero.
read all the values into main memory.
set the accumulator variable to an initial value, usually zero.

Explanation

Question 30 of 100

Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

Select one of the following:

instances
relationships
methods
fields

Explanation

Question 31 of 100

After the header, the body of the method appears inside a set of

Select one of the following:

brackets, [].
braces, {}.
parentheses, ().
double quotes, "" .

Explanation

Question 32 of 100

A for loop normally performs which of these steps?

Select one of the following:

update the control variable during each iteration
test the control variable by comparing it to a maximum/minimum value and terminate when the variable reaches that value
initialize a control variable to a starting value
All of these

Explanation

Question 33 of 100

In UML diagrams, what symbol indicates that a member is public?

Select one of the following:

Explanation

Question 34 of 100

How many times will the following do-while loop be executed?

Select one of the following:

Explanation

Question 35 of 100

What would be the value of discountRate after the following statements are executed?

Select one of the following:

0.04
0.0
0.06
0.08

Explanation

Question 36 of 100

A method (NEED TO FIND ANSWER)

Select one of the following:

must have at least two parameter variables. (NOT THIS ONE)
may have zero or more parameter variables.
may have only one parameter variables.
never has parameter variables.

Explanation

Question 37 of 100

What is the result of the following expression?

Select one of the following:

-50
25
5
-5

Explanation

Question 38 of 100

What will be the result of the following code?

Select one of the following:

The value variable will contain the lowest value in the numbers array.
The value variable will contain the average of all the values in the numbers array.
The value variable will contain the sum of all the values in the numbers array.
The value variable will contain the highest value in the numbers array.

Explanation

Question 39 of 100

A loop that executes as long as a particular condition exists is called a(n) ________ loop.

Select one of the following:

count-controlled
infinite
relational
conditional

Explanation

Question 40 of 100

UML diagrams do not contain

Select one of the following:

object names
class names
methods
fields

Explanation

Question 41 of 100

To print "Hello, world" on the monitor, use the following Java statement:

Select one of the following:

SystemOutPrintln('Hello, world');
system.out.println{Hello, world};
System.out.println("Hello, world");
System Print = "Hello, world";

Explanation

Question 42 of 100

If str1 and str2 are both String objects, which of the following expressions will correctly determine
whether or not they are equal?

Select one of the following:

str1 == str2
str1 + str2
str1 && str2
str1.equals(str2)

Explanation

Question 43 of 100

What will be displayed after the following code has been executed?

Select one of the following:

10
100
The code contains an error and will not compile.
120

Explanation

Question 44 of 100

The key word new

Select one of the following:

creates a new class.
creates an object in memory.
creates a new Java byte code file.
creates a new variable in memory.

Explanation

Question 45 of 100

Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?

Select one of the following:

str1 || str2
str1.equalsInsensitive(str2)
str1 != str2
str1.equalsIgnoreCase(str2)

Explanation

Question 46 of 100

How many times will the following do-while loop be executed?

Select one of the following:

Explanation

Question 47 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 48 of 100

A UML diagram uses the ________ symbol to indicate that a member is private.

Select one of the following:

Explanation

Question 49 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 50 of 100

Which of the following is not a rule that must be followed when naming identifiers?

Select one of the following:

Uppercase and lowercase characters are distinct.
The first character must be one of the letters a-z, A-Z, an underscore or a dollar sign.
After the first character, you may use the letters a-z, A-Z, an underscore, a dollar sign, or digits 0-9.
Identifiers can contain spaces.

Explanation

Question 51 of 100

A computer program is

Select one of the following:

a set of instructions that enable the computer to solve a problem or perform a task.
pseudocode.
a flow chart.
main memory

Explanation

Question 52 of 100

In all but rare cases, loops must contain within themselves

Select one of the following:

arithmetic operators.
if statements.
nested loops.
a way to terminate.

Explanation

Question 53 of 100

A method's signature consists of

Select one of the following:

the return type, the method name, and the parameter list.
the return type and the method name.
the method name and the parameter list.
the size of the method in memory.

Explanation

Question 54 of 100

What does the following UML diagram entry mean?

Select one of the following:

a private method with no parameters that returns a double data type
a public method with a parameter of data type double that does not return a value
a private field called Height that is a double data type
a public field called Height that is a double data type

Explanation

Question 55 of 100

Using a for loop, write Java code that prints out all multiples of 5 from 0 to 100, inclusively, to the console.

Select one of the following:

True
False

Explanation

Question 56 of 100

A loop that repeats a specific number of times is known as a(n) ________ loop.

Select one of the following:

pretest
count-controlled
infinite
conditional

Explanation

Question 57 of 100

What will be displayed when the following code is executed?

Select one of the following:

45,678.3
45,678.259
45,678.26
45678.259

Explanation

Question 58 of 100

What will be the values of ans, x, and y after the following statements are executed?

Select one of the following:

ans = 45, x = 50, y = 50
ans = 60, x = 0, y = 50
ans = 45, x = 50, y = 0
ans = 60, x = 50, y =100

Explanation

Question 59 of 100

What would be the value of x after the following statements were executed?

Select one of the following:

Explanation

Question 60 of 100

When working with the PrintWriter class, which of the following import statements should you
have near the top of your program?

Select one of the following:

import javax.swing.*;
import java.file.*;
import javac.io.*;
import java.io.*;

Explanation

Question 61 of 100

The boolean expression in an if statement must evaluate to

Select one of the following:

positive or negative.
degrees or radians.
left or right.
true or false.

Explanation

Question 62 of 100

This is a named storage location in the computer's memory.

Select one of the following:

Constant
Variable
Literal
Operator

Explanation

Question 63 of 100

Methods that operate on an object's fields are called

Select one of the following:

instance methods
instance variables
private methods
public methods

Explanation

Question 64 of 100

The variable used to keep the running total is called a(n)

Select one of the following:

sentinel
summation
accumulator
integer

Explanation

Question 65 of 100

If object1 and object2 are objects of the same class, to make object2 a copy of object1

Select one of the following:

use an assignment statement to make object2 a copy of object1.
use the copy method that is a part of the Java API.
write a method for the class that will make a field by field copy of object1 data members into object2 data members.
use the default constructor to create object2 with object1 data members.

Explanation

Question 66 of 100

If you wish to use the System.out.printf method to print a string argument, use the ________
format specifier.

Select one of the following:

Explanation

Question 67 of 100

A static field is created by placing the key word static

Select one of the following:

in brackets, before the field's data type.
after the field name.
after the access specifier and field's data type.
after the access specifier and before the field's data type.

Explanation

Question 68 of 100

Character literals are enclosed in , and string literals are enclosed in .

Select one of the following:

single quotes, double quotes
double quotes, double quotes
single quotes, single quotes
double quotes, single quotes

Explanation

Question 69 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 70 of 100

Which of the following expressions determines whether the char variable chrA is not equal to the
letter 'A'?

Select one of the following:

chrA || 'A'
chrA == 'A'
chrA.notEquals('A')
chrA != 'A'

Explanation

Question 71 of 100

A block of code is enclosed in a set of

Select one of the following:

brackets
braces
double quotes
parentheses

Explanation

Question 72 of 100

A class's responsibilities include

Select one of the following:

both the things a class is responsible for knowing and the things a class is responsible for doing
neither the things a class is responsible for knowing nor the things a class is responsible for doing
the things a class is responsible for knowing.
the things a class is responsible for doing.

Explanation

Question 73 of 100

What is syntax? (NEED RIGHT ANSWER)

Select one of the following:

Words that have a special meaning in the programming language.
Words or names defined by the programmer. (NOT ANSWER)
Rules that must be followed when writing a program.
Symbols or words that perform operations.

Explanation

Question 74 of 100

Which of the following statements opens a file named MyFile.txt and allows you to read data from
it?

Select one of the following:

File file = new File("MyFile.txt");
File file = new File("MyFile.txt"); Scanner inputFile = new Scanner(file);
Scanner inputFile = new Scanner("MyFile.txt");
PrintWriter inputFile = new PrintWriter("MyFile.txt");

Explanation

Question 75 of 100

What is the value of ans after the following code has been executed?

Select one of the following:

30
50
80
The code contains an error and will not compile.

Explanation

Question 76 of 100

The ________ statement is used to create a decision structure, which allows a program to have
more than one path of execution.

Select one of the following:

null
block
flag
if

Explanation

Question 77 of 100

Rewrite the following if-else if statement as a switch statement:

Select one of the following:

True
False

Explanation

Question 78 of 100

What will be displayed when the following code is executed? (NEED RIGHT ANSWER)

Select one of the following:

30
The code contains an error and will not compile. (NOT ANSWER)
20
40

Explanation

Question 79 of 100

What is the result of the following expression?

Select one of the following:

Explanation

Question 80 of 100

A search algorithm

Select one of the following:

arranges elements in ascending order.
is rarely used with arrays.
arranges elements in descending order.
is used to locate a specific item in a larger collection of data.

Explanation

Question 81 of 100

Overloading is

Select one of the following:

having two or more methods with the same name, but different signatures.
having two or more methods with the same signature.
writing a method that does too much processing.
writing a program that is too large to fit in memory. (NOT RIGHT)

Explanation

Question 82 of 100

A constructor

Select one of the following:

always has an access specifier of private.
always accepts two arguments.
has return type of void.
has the same name as the class.

Explanation

Question 83 of 100

Data hiding, which means that critical data stored inside the object is protected from code outside
the object, is accomplished in Java by

Select one of the following:

using the public access specifier on the class methods.
using the private access specifier on the class methods.
using the private access specifier on the class fields.
using the private access specifier on the class definition.

Explanation

Question 84 of 100

Which of the following expressions will determine whether x is less than or equal to y?

Select one of the following:

x =< y
x <= y
x >= y
x => y

Explanation

Question 85 of 100

When saving a Java source file, save it with an extension of

Select one of the following:

.class.
.java.
.javac.
.src.

Explanation

Question 86 of 100

Another term for an object of a class is a(n)

Select one of the following:

instance
method
member
access specifier

Explanation

Question 87 of 100

Which of the following statements determines whether temp is within the range of 0 through
100?

Select one of the following:

if (temp >= 0 && temp <= 100)
if (temp > 0 || temp < 100)
if (temp >= 0 || temp <= 100)
if (temp > 0 && temp < 100)

Explanation

Question 88 of 100

Using a switch statement, write Java code to output the season of the year to the console based
on the value of an integer variable called month according to the following:

Select one of the following:

True
False

Explanation

Question 89 of 100

What will be the result of the following code? (NEED ANSWER)

Select one of the following:

All the values in the array will be initialized to 10.0.
A runtime error will occur. (NOT RIGHT)
All the values in the array, except the first, will be set to 10.0.
The code contains a syntax error and will not compile.

Explanation

Question 90 of 100

A constructor is a method that

Select one of the following:

removes the object from memory.
performs initialization or setup operations.
never receives any arguments.
returns an object of the class.

Explanation

Question 91 of 100

A group of related classes is called a(n)

Select one of the following:

archive
package
collection
attachment

Explanation

Question 92 of 100

Assuming that inputFile references a Scanner object that was used to open a file, which of the
following statements will read an int from the file?

Select one of the following:

int number = inputFile.next();
int number = inputFile.integer();
int number = inputFile.readInt();
int number = inputFile.nextInt();

Explanation

Question 93 of 100

What does the following code do?

Select one of the following:

It establishes a connection with a file named filename.
It allows the user to enter the name of the file that data will to be written to.
Nothing. The code contains a syntax error.
It writes to a file named filename.

Explanation

Question 94 of 100

The ________ loop is ideal in situations where you always want the loop to iterate at least once.

Select one of the following:

for
do-while
pretest
while

Explanation

Question 95 of 100

A ________ is a value that signals when the end of a list of values has been reached.

Select one of the following:

sentinel
token
delimiter
terminal

Explanation

Question 96 of 100

________ is the term for the relationship created by object aggregation.

Select one of the following:

Inner Class
One-to-many
"Is a"
"Has a"

Explanation

Question 97 of 100

Which Scanner class method reads a String?

Select one of the following:

nextLine
charAt
nextString
getLine

Explanation

Question 98 of 100

Enclosing a group of statements inside a set of braces creates

Select one of the following:

a block of statements.
a relational operator.
an if-else statement.
an expression.

Explanation

Question 99 of 100

This statement tells the compiler where to find the JOptionPane class and makes it available to
your program.

Select one of the following:

import javax.JOptionPane;
import javax.swing.JOptionPane;
import Java.Swing.JOptionPane;
import JOptionPane;

Explanation

Question 100 of 100

Which of the following is not a valid Java comment?

Select one of the following:

/** Comment 1 */
// Comment 3
*/ Comment 2 /*
/* Comment 4 */

Explanation

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Computer Science Quiz on Java (Ch 1 - Ch 7), created by Heather Williams on 06/23/2018.

Java (Ch 1 - Ch 7)

Java (Ch 1 - Ch 7)

Question 1 of 100

Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?

Select one of the following:

Explanation

Question 2 of 100

When an object is created, the attributes associated with the object are called

Select one of the following:

Explanation

Question 3 of 100

What will be the value of x after the following code is executed?

Select one of the following:

Explanation

Question 4 of 100

Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8%?

Select one of the following:

Explanation

Question 5 of 100

Given the following statement, which statement will write the string "Calvin" to the file DiskFile.txt?

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Question 6 of 100

What would be the value of discountRate after the following statements are executed?

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Question 7 of 100

The ________ is ideal in situations where the exact number of iterations is known.

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Question 8 of 100

What will be the result of executing the following code?

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Question 9 of 100

What will be displayed when the following code is executed?

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Question 10 of 100

What will be the value of bonus after the following code is executed?

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Question 11 of 100

In an if-else statement, if the boolean expression is false

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Question 12 of 100

Assume that inputFile references a Scanner object that was used to open a file. Which of the following while loops shows the correct way to read data from the file until the end of the file is reached?

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Question 13 of 100

What would be the value of discountRate after the following statements are executed?

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Question 14 of 100

A ________ is a boolean variable that signals when some condition exists in the program.

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Question 15 of 100

You should not define a class field that is dependent upon the values of other class fields

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Question 16 of 100

Variables are classified according to their

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Question 17 of 100

A class that is defined inside of another class is called a(n)

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Question 18 of 100

Because Java byte code is the same on all computers, compiled Java programs

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Question 19 of 100

Java requires that the boolean expression being tested by an if statement be enclosed in

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Question 20 of 100

Assume that inputFile references a Scanner object that was used to open a file. Which of the
following while loops shows the correct way to read data from the file until the end of the file is
reached?

________ operators are used to determine whether a specific relationship exists between two
values.