14244593
Descripción
Test por Heather Williams, actualizado hace más de 1 año
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Creado por Heather Williams
hace casi 6 años
|
|
Pregunta 1
Pregunta
Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?
Respuesta
-
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);
Pregunta 2
Pregunta
When an object is created, the attributes associated with the object are called
Respuesta
-
instance fields
-
fixed attributes
-
instance methods
-
class instances
Pregunta 3
Pregunta
What will be the value of x after the following code is executed?
Image:
Q3 (binary/octet-stream)
Respuesta
-
110
-
90
-
130
-
210
Pregunta 4
Pregunta
Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8%?
Respuesta
-
"###.##%"
-
"#0.00%"
-
"##0.0%"
-
"000.0%"
Pregunta 5
Pregunta
Given the following statement, which statement will write the string "Calvin" to the file DiskFile.txt?
Image:
Q5 (binary/octet-stream)
Respuesta
-
PrintWriter.println("Calvin");
-
diskOut.println("Calvin");
-
System.out.println(diskOut, "Calvin");
-
DiskFile.println("Calvin");
Pregunta 6
Pregunta
What would be the value of discountRate after the following statements are executed?
Respuesta
-
0.03
-
0.0
-
0.01
-
0.05
Pregunta 7
Pregunta
The ________ is ideal in situations where the exact number of iterations is known.
Respuesta
-
posttest loop
-
while loop
-
do-while loop
-
for loop
Pregunta 8
Respuesta
-
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.
Pregunta 9
Pregunta
What will be displayed when the following code is executed?
Image:
Q9 (binary/octet-stream)
Respuesta
-
45678.259
-
45,678.26
-
0,045,678.26
-
45,678.3
Pregunta 10
Pregunta
What will be the value of bonus after the following code is executed?
Image:
Q10 (binary/octet-stream)
Respuesta
-
1000
-
500
-
1250
-
750
Pregunta 11
Pregunta
In an if-else statement, if the boolean expression is false
Respuesta
-
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.
Pregunta 12
Pregunta
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?
Respuesta
-
while (inputFile.hasNext())
-
while (!inputFile.EOF)
-
while (inputFile.nextLine == " ")
-
while (inputFile != null)
Pregunta 13
Pregunta
What would be the value of discountRate after the following statements are executed?
Image:
Q13 (binary/octet-stream)
Respuesta
-
0.04
-
0.0
-
0.03
-
0.05
Pregunta 14
Pregunta
A ________ is a boolean variable that signals when some condition exists in the program.
Respuesta
-
flag
-
block
-
case
-
sentinel
Pregunta 15
Pregunta
You should not define a class field that is dependent upon the values of other class fields
Respuesta
-
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.
Pregunta 16
Pregunta
Variables are classified according to their
Respuesta
-
values
-
data type
-
names
-
location in memory.
Pregunta 17
Pregunta
A class that is defined inside of another class is called a(n)
Respuesta
-
inner class
-
helper class
-
nested class
-
enumerated class
Pregunta 18
Pregunta
Because Java byte code is the same on all computers, compiled Java programs
Respuesta
-
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.
Pregunta 19
Pregunta
Java requires that the boolean expression being tested by an if statement be enclosed in
Respuesta
-
a set of double quotes.
-
a set of brackets.
-
a set of braces.
-
a set of parentheses.
Pregunta 20
Pregunta
The scope of a local variable is
Respuesta
-
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.
Pregunta 21
Pregunta
What will be returned from the method, if the following is the method header?
Image:
Q21 (binary/octet-stream)
Respuesta
-
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
Pregunta 22
Pregunta
How many bits are in a byte?
Respuesta
-
4
-
8
-
16
-
32
Pregunta 23
Pregunta
What will be the value of x after the following code is executed?
Image:
Q23 (binary/octet-stream)
Respuesta
-
110
-
90
-
10
-
100
Pregunta 24
Pregunta
If you do not provide initialization values for a class's numeric fields, they will
Respuesta
-
cause a runtime error.
-
contain an unknown value.
-
cause a compiler error.
-
be automatically initialized with 0.
Pregunta 25
Pregunta
________ operators are used to determine whether a specific relationship exists between two
values.
Respuesta
-
Relational
-
Arithmetic
-
Logical
-
Assignment
Pregunta 26
Pregunta
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.
Respuesta
- True
- False
Pregunta 27
Respuesta
-
11
-
12
-
10
-
0
Pregunta 28
Pregunta
This type of loop will always be executed at least once.
Respuesta
-
pretest
-
posttest
-
infinite
-
conditional
Pregunta 29
Pregunta
Before entering a loop to compute a running total, the program should first
Respuesta
-
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.
Pregunta 30
Pregunta
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
Respuesta
-
instances
-
relationships
-
methods
-
fields
Pregunta 31
Pregunta
After the header, the body of the method appears inside a set of
Respuesta
-
brackets, [].
-
braces, {}.
-
parentheses, ().
-
double quotes, "" .
Pregunta 32
Pregunta
A for loop normally performs which of these steps?
Respuesta
-
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
Pregunta 33
Pregunta
In UML diagrams, what symbol indicates that a member is public?
Respuesta
-
*
-
+
-
#
-
-
Pregunta 34
Pregunta
How many times will the following do-while loop be executed?
Image:
Q34 (binary/octet-stream)
Respuesta
-
3
-
5
-
1
-
4
Pregunta 35
Pregunta
What would be the value of discountRate after the following statements are executed?
Image:
Q35 (binary/octet-stream)
Respuesta
-
0.04
-
0.0
-
0.06
-
0.08
Pregunta 36
Pregunta
A method (NEED TO FIND ANSWER)
Respuesta
-
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.
Pregunta 37
Respuesta
-
-50
-
25
-
5
-
-5
Pregunta 38
Respuesta
-
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.
Pregunta 39
Pregunta
A loop that executes as long as a particular condition exists is called a(n) ________ loop.
Respuesta
-
count-controlled
-
infinite
-
relational
-
conditional
Pregunta 40
Pregunta
UML diagrams do not contain
Respuesta
-
object names
-
class names
-
methods
-
fields
Pregunta 41
Pregunta
To print "Hello, world" on the monitor, use the following Java statement:
Respuesta
-
SystemOutPrintln('Hello, world');
-
system.out.println{Hello, world};
-
System.out.println("Hello, world");
-
System Print = "Hello, world";
Pregunta 42
Pregunta
If str1 and str2 are both String objects, which of the following expressions will correctly determine
whether or not they are equal?
Respuesta
-
str1 == str2
-
str1 + str2
-
str1 && str2
-
str1.equals(str2)
Pregunta 43
Pregunta
What will be displayed after the following code has been executed?
Image:
Q43 (binary/octet-stream)
Respuesta
-
10
-
100
-
The code contains an error and will not compile.
-
120
Pregunta 44
Pregunta
The key word new
Respuesta
-
creates a new class.
-
creates an object in memory.
-
creates a new Java byte code file.
-
creates a new variable in memory.
Pregunta 45
Pregunta
Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?
Respuesta
-
str1 || str2
-
str1.equalsInsensitive(str2)
-
str1 != str2
-
str1.equalsIgnoreCase(str2)
Pregunta 46
Pregunta
How many times will the following do-while loop be executed?
Image:
Q46 (binary/octet-stream)
Respuesta
-
1
-
4
-
5
-
0
Pregunta 47
Pregunta
What will be the value of x after the following code is executed?
Image:
Q47 (binary/octet-stream)
Respuesta
-
30
-
40
-
50
-
25
Pregunta 48
Pregunta
A UML diagram uses the ________ symbol to indicate that a member is private.
Respuesta
-
-
-
#
-
+
-
*
Pregunta 49
Pregunta
What will be the value of x after the following code is executed?
Image:
Q49 (binary/octet-stream)
Respuesta
-
135
-
60
-
75
-
15
Pregunta 50
Pregunta
Which of the following is not a rule that must be followed when naming identifiers?
Respuesta
-
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.
Pregunta 51
Pregunta
A computer program is
Respuesta
-
a set of instructions that enable the computer to solve a problem or perform a task.
-
pseudocode.
-
a flow chart.
-
main memory
Pregunta 52
Pregunta
In all but rare cases, loops must contain within themselves
Respuesta
-
arithmetic operators.
-
if statements.
-
nested loops.
-
a way to terminate.
Pregunta 53
Pregunta
A method's signature consists of
Respuesta
-
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.
Pregunta 54
Respuesta
-
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
Pregunta 55
Pregunta
Using a for loop, write Java code that prints out all multiples of 5 from 0 to 100, inclusively, to the console.
Respuesta
- True
- False
Pregunta 56
Pregunta
A loop that repeats a specific number of times is known as a(n) ________ loop.
Respuesta
-
pretest
-
count-controlled
-
infinite
-
conditional
Pregunta 57
Pregunta
What will be displayed when the following code is executed?
Image:
Q57 (binary/octet-stream)
Respuesta
-
45,678.3
-
45,678.259
-
45,678.26
-
45678.259
Pregunta 58
Pregunta
What will be the values of ans, x, and y after the following statements are executed?
Image:
Q58 (binary/octet-stream)
Respuesta
-
ans = 45, x = 50, y = 50
-
ans = 60, x = 0, y = 50
-
ans = 45, x = 50, y = 0
-
ans = 60, x = 50, y =100
Pregunta 59
Pregunta
What would be the value of x after the following statements were executed?
Image:
Q59 (binary/octet-stream)
Respuesta
-
5
-
20
-
30
-
25
Pregunta 60
Pregunta
When working with the PrintWriter class, which of the following import statements should you
have near the top of your program?
Respuesta
-
import javax.swing.*;
-
import java.file.*;
-
import javac.io.*;
-
import java.io.*;
Pregunta 61
Pregunta
The boolean expression in an if statement must evaluate to
Respuesta
-
positive or negative.
-
degrees or radians.
-
left or right.
-
true or false.
Pregunta 62
Pregunta
This is a named storage location in the computer's memory.
Respuesta
-
Constant
-
Variable
-
Literal
-
Operator
Pregunta 63
Pregunta
Methods that operate on an object's fields are called
Respuesta
-
instance methods
-
instance variables
-
private methods
-
public methods
Pregunta 64
Pregunta
The variable used to keep the running total is called a(n)
Respuesta
-
sentinel
-
summation
-
accumulator
-
integer
Pregunta 65
Pregunta
If object1 and object2 are objects of the same class, to make object2 a copy of object1
Respuesta
-
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.
Pregunta 66
Pregunta
If you wish to use the System.out.printf method to print a string argument, use the ________
format specifier.
Respuesta
-
%f
-
%s
-
%d
-
%b
Pregunta 67
Pregunta
A static field is created by placing the key word static
Respuesta
-
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.
Pregunta 68
Pregunta
Character literals are enclosed in ________, and string literals are enclosed in ________.
Respuesta
-
single quotes, double quotes
-
double quotes, double quotes
-
single quotes, single quotes
-
double quotes, single quotes
Pregunta 69
Pregunta
What will be the value of x after the following code is executed?
Image:
Q69 (binary/octet-stream)
Respuesta
-
14
-
16
-
15
-
0
Pregunta 70
Pregunta
Which of the following expressions determines whether the char variable chrA is not equal to the
letter 'A'?
Respuesta
-
chrA || 'A'
-
chrA == 'A'
-
chrA.notEquals('A')
-
chrA != 'A'
Pregunta 71
Pregunta
A block of code is enclosed in a set of
Respuesta
-
brackets
-
braces
-
double quotes
-
parentheses
Pregunta 72
Pregunta
A class's responsibilities include
Respuesta
-
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.
Pregunta 73
Pregunta
What is syntax? (NEED RIGHT ANSWER)
Respuesta
-
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.
Pregunta 74
Pregunta
Which of the following statements opens a file named MyFile.txt and allows you to read data from
it?
Respuesta
-
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");
Pregunta 75
Pregunta
What is the value of ans after the following code has been executed?
Image:
Q75 (binary/octet-stream)
Respuesta
-
30
-
50
-
80
-
The code contains an error and will not compile.
Pregunta 76
Pregunta
The ________ statement is used to create a decision structure, which allows a program to have
more than one path of execution.
Respuesta
-
null
-
block
-
flag
-
if
Pregunta 77
Pregunta
Rewrite the following if-else if statement as a switch statement:
Image:
Q77 (binary/octet-stream)
Respuesta
- True
- False
Pregunta 78
Pregunta
What will be displayed when the following code is executed? (NEED RIGHT ANSWER)
Image:
Q78 (binary/octet-stream)
Respuesta
-
30
-
The code contains an error and will not compile. (NOT ANSWER)
-
20
-
40
Pregunta 79
Respuesta
-
105
-
8
-
12
-
7
Pregunta 80
Pregunta
A search algorithm
Respuesta
-
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.
Pregunta 81
Pregunta
Overloading is
Respuesta
-
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)
Pregunta 82
Pregunta
A constructor
Respuesta
-
always has an access specifier of private.
-
always accepts two arguments.
-
has return type of void.
-
has the same name as the class.
Pregunta 83
Pregunta
Data hiding, which means that critical data stored inside the object is protected from code outside
the object, is accomplished in Java by
Respuesta
-
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.
Pregunta 84
Pregunta
Which of the following expressions will determine whether x is less than or equal to y?
Respuesta
-
x =< y
-
x <= y
-
x >= y
-
x => y
Pregunta 85
Pregunta
When saving a Java source file, save it with an extension of
Respuesta
-
.class.
-
.java.
-
.javac.
-
.src.
Pregunta 86
Pregunta
Another term for an object of a class is a(n)
Respuesta
-
instance
-
method
-
member
-
access specifier
Pregunta 87
Pregunta
Which of the following statements determines whether temp is within the range of 0 through
100?
Respuesta
-
if (temp >= 0 && temp <= 100)
-
if (temp > 0 || temp < 100)
-
if (temp >= 0 || temp <= 100)
-
if (temp > 0 && temp < 100)
Pregunta 88
Pregunta
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:
Image:
Q88 (binary/octet-stream)
Respuesta
- True
- False
Pregunta 89
Pregunta
What will be the result of the following code? (NEED ANSWER)
Image:
Q89 (binary/octet-stream)
Respuesta
-
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.
Pregunta 90
Pregunta
A constructor is a method that
Respuesta
-
removes the object from memory.
-
performs initialization or setup operations.
-
never receives any arguments.
-
returns an object of the class.
Pregunta 91
Pregunta
A group of related classes is called a(n)
Respuesta
-
archive
-
package
-
collection
-
attachment
Pregunta 92
Pregunta
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?
Respuesta
-
int number = inputFile.next();
-
int number = inputFile.integer();
-
int number = inputFile.readInt();
-
int number = inputFile.nextInt();
Pregunta 93
Respuesta
-
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.
Pregunta 94
Pregunta
The ________ loop is ideal in situations where you always want the loop to iterate at least once.
Respuesta
-
for
-
do-while
-
pretest
-
while
Pregunta 95
Pregunta
A ________ is a value that signals when the end of a list of values has been reached.
Respuesta
-
sentinel
-
token
-
delimiter
-
terminal
Pregunta 96
Pregunta
________ is the term for the relationship created by object aggregation.
Respuesta
-
Inner Class
-
One-to-many
-
"Is a"
-
"Has a"
Pregunta 97
Pregunta
Which Scanner class method reads a String?
Respuesta
-
nextLine
-
charAt
-
nextString
-
getLine
Pregunta 98
Pregunta
Enclosing a group of statements inside a set of braces creates
Respuesta
-
a block of statements.
-
a relational operator.
-
an if-else statement.
-
an expression.
Pregunta 99
Pregunta
This statement tells the compiler where to find the JOptionPane class and makes it available to
your program.
Respuesta
-
import javax.JOptionPane;
-
import javax.swing.JOptionPane;
-
import Java.Swing.JOptionPane;
-
import JOptionPane;
Pregunta 100
Pregunta
Which of the following is not a valid Java comment?
Respuesta
-
/** Comment 1 */
-
// Comment 3
-
*/ Comment 2 /*
-
/* Comment 4 */
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