Section 4 Quiz
(Answer
all questions in this section)
1.
What will the following code segment output?
Mark for Review
(1) Points
"\\"
(*)
"\\\"
\"\\\\\"
"\\\\\"
2. The String methods equals and compareTo
perform similar functions and differ in their return type. True or false? Mark for Review
(1) Points
True (*)
False
3. Consider the following code snippet. What
is printed?
String river = new String("Hudson");
System.out.println(river.length());
Mark for Review
(1) Points
8
7
Hudson
river
6 (*)
4. Which of the following defines a driver
class? Mark for Review
(1) Points
Contains
a main method and other static methods. (*)
Contains
classes that define objects.
Contains
a main method, a package, static methods, and classes that define objects.
None of
the above.
5. The following defines a class keyword: Mark for Review
(1) Points
Provides
the compiler information that identifies outside classes used within the
current class.
Precedes
the name of the class. (*)
Defines
where this class lives relative to other classes, and provides a level of
access control.
6. Which of
the two diagrams below illustrate the general form of a Java program?
Mark for Review
(1) Points
Example
A
Example
B (*)
7. When importing
another package into a class you must import only the package classes that will
be called and not the entire package. True or false? Mark for Review
(1) Points
True
False
(*)
8. What two
values can a boolean variable have?
Mark for Review
(1) Points
Relational
and logic operators
Arithmetic
and logic operators
True and
false (*)
Numbers
and characters
Integers
and floating point types
9. Which
line of Java code assigns the value of 5 raised to the power of 8 to a? Mark for Review
(1) Points
int
a=Math.pow(5,8);
double
a=Math.pow(5,8); (*)
double
a=15^8;
int
a=Math.pow(8,5);
double
a=pow(8,5);
10. What is the output of the following lines
of code?
int j=6,k=8,m=2,result;
result=j-k%3*m;
System.out.println(result); Mark for Review
(1) Points
-42
2 (*)
6
0
11. What will the method methodA print to the
screen?
Mark for Review
(1) Points
15
6
3
18 (*)
12. Write a declaration statement that will
hold a number like 2.541. Mark for
Review
(1) Points
float number;
(*)
boolean
number;
char
number;
int
number;
13. For every opening curly brace { there must
be a closing curly brace} or the program will not compile without error. True
or False? Mark for Review
(1) Points
True (*)
False
14. You can return to the Eclipse Welcome Page
by choosing Welcome from what menu?
Mark for Review
(1) Points
Close
Edit
File
Help (*)
15. Tabs are used when more than one file is
open in the edit area. True or False?
Mark for Review
(1) Points
True (*)
False
1. Consider the following:
You are writing a class and are using a global variable.
Inside a method you declare a local variable with the same name as the global
variable.
This programming style is poor because inside the method
the global variable will have precedence over the local variable with the same
name.
True or false?
Mark for Review
(1) Points
True
False
(*)
2. Which of the following statements
correctly assigns "3 times 10 to the 4th power" to the variable
number? Mark for Review
(1) Points
double
number=3(e4);
double
number=3*10e4;
double
number=3*10^4;
double
number=3e4; (*)
3. Which line of code does not assign 3.5 to
the variable x? Mark for Review
(1) Points
3.5=x;
(*)
x=7.0/2.0;
double
x=3.5
x=3.5;
4. A local variable has precedence over a
global variable in a Java method. True or false? Mark for Review
(1) Points
True (*)
False
5. What does the following program output?
Mark for Review
(1) Points
"total
cost: " 48
total
cost: 48
"total
cost: " 40
total
cost: + 40
total
cost: 40 (*)
6. For every
opening curly brace { there must be a closing curly brace} or the program will
not compile without error. True or False?
Mark for Review
(1) Points
True (*)
False
7. The
______________ is the location into which you will store and save your files. Mark for Review
(1) Points
Perspective
Workspace
(*)
Editor
None of
the above
8. What
symbols are required for a compiler to ignore a comment? Mark for Review
(1) Points
/*/
/*
*/
// (*)
9. The
following program prints "Equal". True or false?
Mark for Review
(1) Points
True
False
(*)
10. Suppose that s1 and s2 are two strings.
Which of the statements or expressions are valid? Mark for Review
(1) Points
(Choose
all correct answers)
String
s3 = s1 + s2; (*)
String
s3 = s1 - s2;
s1.compareTo(s2);
(*)
int m =
s1.length(); (*)
s1 <=
s2
11. Declaring
and instantiating a String is much like any other type of variable. However,
once instantiated, they are final and cannot be changed. True or false? Mark for Review
(1) Points
True (*)
False
12. The
following defines a package keyword:
Mark for Review
(1) Points
Defines
where this class lives relative to other classes, and provides a level of
access control. (*)
Provides
the compiler information that identifies outside classes used within the
current class.
Precedes
the name of the class.
13. The
following defines a class keyword:
Mark for Review
(1) Points
Provides
the compiler information that identifies outside classes used within the
current class.
Precedes
the name of the class. (*)
Defines
where this class lives relative to other classes, and provides a level of
access control.
14. The
following defines a class keyword:
Mark for Review
(1) Points
Precedes
the name of the class. (*)
Defines
where this class lives relative to other classes, and provides a level of
access control.
Provides
the compiler information that identifies outside classes used within the
current class.
15. When
importing another package into a class you must import the entire package as
well as the package classes that will be called. True or False? Mark for Review
(1) Points
True
False
(*)
1. Match
each of the following literals ('x', 10, 10.2, 100L, "hello") with
its respective data type. Mark for
Review
(1) Points
char,
boolean, float, long, String
char,
double, int, long, String
char,
int, long, float, String
boolean,
byte, int, long, Short
char,
int, double, long, String (*)
2. Which
line of Java code will assign the value of the square root of 11 to a variable
named a? Mark for Review
(1) Points
int
a=Math.sqrt(11);
double
a=11^(1/2);
double
a=Math.sqrt*11;
double a=Math.sqrt(11);
(*)
double
a=sqrt(11);
3. Which of
the following statements displays 12345?
I. System.out.println( 123 * 100 + 45);
II. System.out.println("123" + 45);
III. System.out.println( 12 + "345"); Mark for Review
(1) Points
All of
the above. (*)
I only.
I and II
only.
II and
III only.
None of
the above.
4. Consider
the following:
You are writing a class and are using a global variable.
Inside a method you declare a local variable with the same name as the global
variable.
This programming style is poor because inside the method
the global variable will have precedence over the local variable with the same
name.
True or false?
Mark for Review
(1) Points
True
False
(*)
5. Select
the declaration and initialization statement that will hold the letter J. Mark for Review
(1) Points
String
letter='J';
char
letter='J'; (*)
int
letter='J';
float
letter='J';
6. For every
opening curly brace { there does not need to be a closing curly brace} for the
program to compile without error. True or False? Mark for Review
(1) Points
True
False
(*)
7. Two
variables are required to support a conversion of one unit of measure to
another unit of measure. True or False?
Mark for Review
(1) Points
True (*)
False
8. Eclipse provides
views to help you navigate a hierarchy of information. True or False? Mark for Review
(1) Points
True (*)
False
9. The ==
operator can be used to compare two String objects. The result is always true
if the two strings are identical. True or false? Mark for Review
(1) Points
True
False
(*)
10. Consider
the following code snippet
String forest = new String("Black");
System.out.println(forest.length());
What is printed?
Mark for Review
(1) Points
Forest
7
6
Black
5 (*)
11. The following program prints
"Equal". True or false?
Mark for Review
(1) Points
True (*)
False
12. The following defines a package keyword: Mark for Review
(1) Points
Provides
the compiler information that identifies outside classes used within the
current class.
Defines
where this class lives relative to other classes, and provides a level of
access control. (*)
Precedes
the name of the class.
13. Which of the two diagrams below illustrate
the general form of a Java program?
Mark for Review
(1) Points
Example
A
Example
B (*)
14. Which
of the two diagrams below illustrate the general form of a Java program?
Mark for Review
(1) Points
Example
A
Example
B (*)
15. Which of the following defines a driver
class? Mark for Review
(1) Points
Contains
a main method and other static methods. (*)
Contains
classes that define objects.
Contains
a main method, a package, static methods, and classes that define objects.
None of
the above.
1. In
Eclipse, when you run a Java Application, the results are displayed in a new
window. True or False? Mark
for Review
(1) Points
True
False
(*)
2. Multiple
windows are used when more than one file is open in the edit area. True or
False? Mark for Review
(1) Points
True
False
(*)
3. What is
the purpose of the Eclipse Editor Area and Views? Mark for Review
(1) Points
(Choose
all correct answers)
To
choose the file system location to delete a file.
To
modify elements. (*)
To
navigate a hierarchy of information. (*)
4. The
following defines an import keyword:
Mark for Review
(1) Points
Precedes
the name of the class.
Defines
where this class lives relative to other classes, and provides a level of
access control.
Provides
the compiler information that identifies outside classes used within the
current class. (*)
5. The
following defines a package keyword:
Mark for Review
(1) Points
Precedes
the name of the class.
Provides
the compiler information that identifies outside classes used within the
current class.
Defines
where this class lives relative to other classes, and provides a level of
access control. (*)
6. The
following defines a class keyword:
Mark for Review
(1) Points
Defines
where this class lives relative to other classes, and provides a level of
access control.
Precedes
the name of the class. (*)
Provides
the compiler information that identifies outside classes used within the
current class.
7. The
following defines a class keyword:
Mark for Review
(1) Points
Provides
the compiler information that identifies outside classes used within the
current class.
Defines
where this class lives relative to other classes, and provides a level of
access control.
Precedes
the name of the class. (*)
8. The
following code is an example of creating a String reference:
String s;
True or false?
Mark for Review
(1) Points
True (*)
False
9. Which of
the following statements declares a String object called name? Mark for Review
(1) Points
String
name; (*)
String
name
double
name;
int
name;
10. Given the
code below, which of the following would equate to true?
String s1 = "yes";
String s2 = "yes";
String s3 = new String(s1);
Mark for Review
(1) Points
(Choose
all correct answers)
s1 == s2
(*)
s3.equals(s1)
(*)
s1.equals(s2)
(*)
s1 = s2
s3 == s1
11. Which line
of Java code will assign the value of the square root of 11 to a variable named
a? Mark for Review
(1) Points
double
a=11^(1/2);
double
a=sqrt(11);
double a=Math.sqrt(11);
(*)
double
a=Math.sqrt*11;
int
a=Math.sqrt(11);
12. Which line
of Java code assigns the value of 5 raised to the power of 8 to a? Mark for Review
(1) Points
int
a=Math.pow(5,8);
int
a=Math.pow(8,5);
double
a=pow(8,5);
double
a=15^8;
double
a=Math.pow(5,8); (*)
13. Which line
of Java code properly calculates the area of a triangle using A=1/2(b)(h) where
b and h are Java primitive integers?
Mark for Review
(1) Points
double
A=1/2bh;
double
A=(double)1/(double)2*b*h; (*)
double
A=(double)(1/2)*b*h;
double
A=1/2*b*h;
14. What is
the output of the following lines of code?
int j=7,k=5,m=8,result;
result=j/m*k;
System.out.println(result); Mark for Review
(1) Points
0.175
280
4.375
0 (*)
15. Which of
the following is not a legal name for a variable? Mark for Review
(1) Points
theLastValueButONe
zero
year2000
2bad (*)
1. What is the purpose of the Eclipse Editor
Area and Views? Mark for Review
(1) Points
(Choose
all correct answers)
To
modify elements. (*)
To
choose the file system location to delete a file.
To
navigate a hierarchy of information. (*)
2. A _______________ is used to organize
Java related files. Mark for Review
(1) Points
Project
Collection
Package
(*)
Workspace
3. A workspace can have one or more stored
projects. True or false? Mark for
Review
(1) Points
True (*)
False
4. Which of the two diagrams below
illustrate the general form of a Java program?
Mark for Review
(1) Points
Example
A
Example
B (*)
5. The following defines a class keyword: Mark for Review
(1) Points
Precedes
the name of the class. (*)
Provides
the compiler information that identifies outside classes used within the
current class.
Defines
where this class lives relative to other classes, and provides a level of
access control.
6. The
following defines a package keyword:
Mark for Review
(1) Points
Provides
the compiler information that identifies outside classes used within the
current class.
Defines
where this class lives relative to other classes, and provides a level of
access control. (*)
Precedes
the name of the class.
7. Which of
the two diagrams below illustrate the general form of a Java program?
Mark for Review
(1) Points
Example
A
Example
B (*)
8. Examine
the following code:
What is the value of variable x? Mark for Review
(1) Points
14
2 (*)
6
2.5
9. Which of
the following is not correct Java code?
Mark for Review
(1) Points
double
x=Math.pow; (*)
double
x=Math.sqrt(16);
double
x=Math.pow(3,4)*5.0;
double
x=Math.PI*5.0;
10. What is the output of the following lines
of code?
int j=7,k=5,m=8,result;
result=j/m*k;
System.out.println(result); Mark for Review
(1) Points
0.175
280
4.375
0 (*)
11. What is the output of the following lines
of code?
int j=6,k=8,m=2,result;
result=j-k%3*m;
System.out.println(result); Mark for Review
(1) Points
-42
0
2 (*)
6
12. What two values can a boolean variable
have? Mark for Review
(1) Points
Arithmetic
and logic operators
Integers
and floating point types
Numbers
and characters
Relational
and logic operators
True and
false (*)
13. What is printed by the following code
segment?
Mark for Review
(1) Points
\\\\\\\\\\\\\\
\\\\
\\\\\\\
(*)
\\
14. Declaring and instantiating a String is
much like any other type of variable. However, once instantiated, they are
final and cannot be changed. True or false?
Mark for Review
(1) Points
True (*)
False
15. Consider the following code snippet.
What is printed?
Mark for Review
(1) Points
AtlanticPacificIndianArcticSouthern
Code
does not compile
87658
55555
ArrayIndexOutofBoundsException
is thrown (*)
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