1)When a program does not want to handle exception, the
______class is used.
Ans : Throws
2) The main subclass of the Exception class is _______ class.
Ans : RuntimeException
3) Only subclasses of ______class may be caught or thrown.
Ans : Throwable
4) Any user-defined exception class is a subclass of the _____ class.
Ans : Exception
5) The catch clause of the user-defined exception class should ______ its
Base class catch clause.
Ans : Exception
Ans : Throws
2) The main subclass of the Exception class is _______ class.
Ans : RuntimeException
3) Only subclasses of ______class may be caught or thrown.
Ans : Throwable
4) Any user-defined exception class is a subclass of the _____ class.
Ans : Exception
5) The catch clause of the user-defined exception class should ______ its
Base class catch clause.
Ans : Exception
6) The __________ is the part of a
computer that follows instructions.
[processor]
7) A(n) __________ is a program that
translates programs to a simpler language that the computer can execute.
[compiler]
8) The Java interpreter translates a
Java program from __________ to machine language.
[byte code]
9) A(n) __________ is an action that
a Java object can perform.
[method]
10 ) Another term for __________ is data hiding.
[encapsulation]
11) A(n) __________ is a set of
instructions that tells the basic strategery for solving a problem.
[algorithm]
12) A(n) __________ is a program
meant to be sent from one computer to another
across the world-wide web.
[applet]
13) A(n) __________ is a piece of
information passed to a method.
[argument]
14 )___operator
is used to crate an array.
[[]]
15 )___method can be called without the instance of a class.
15 )___method can be called without the instance of a class.
[static]
16) When an interface method is implemented in a class. it must be declared as ___.
16) When an interface method is implemented in a class. it must be declared as ___.
[Public]
17 )___method of Math class returns the largest integer number less than or equal to given double value.
17 )___method of Math class returns the largest integer number less than or equal to given double value.
[floor]
18) Strings that need modification are handled by ___ class.
18) Strings that need modification are handled by ___ class.
[stringbuffer]
True/False
Questions
1. Main
memory refers to the amount of storage space available on a computer’s disk
drive.
TRUE FALSE
[FALSE]
2. Java
is a high-level language.
TRUE FALSE
[TRUE]
3. The Java compiler translates Java programs into machine
language programs.
TRUE FALSE
[FALSE]
4. Pseudocode
is a mixture of English and a programming language.
TRUE FALSE
[TRUE]
5. The computer will not print an error message when a logic error
occurs.
TRUE FALSE
[TRUE]
6. System.out is an example of a method.
TRUE FALSE
[FALSE]
7. In Java, the
double equal sign means "make equal to".
TRUE FALSE
[FALSE]
8. ice-cream is an illegal identifier in Java.
TRUE FALSE
[TRUE]
Multiple-Choice
Questions
1. A
bit can have __________ different values.
A. 2 B. 10 C. 100 D. 256
[A]
2. Bytes
in auxiliary memory are grouped into __________.
A. bits B. files C. directories D. programs
[B]
3. The
kind of language that is easiest for people to use is
A. assembly
language B. machine language
C. low-level
language D. high-level language
[D]
4. Input
to a compiler is called
A. a
byte-code file B. source code C. an executable
file D. object code
[B]
5. The
term __________ refers to a way of organizing classes that share properties.
A. object-oriented B. encapsulation C. polymorphism D. inheritance
[D]
6. __________
means that two or more methods can have different names in the same way that an
English word can have two or more meanings.
A. object-oriented B. encapsulation C. polymorphism D. inheritance
[C]
7. A(n)
__________ occurs when a program has a grammatical mistake like missing
punctuation.
A. syntax
error B. run-time error C. logic error D. hidden error
[A]
8. If
the computer prints an error message while executing your program, the program
contains a(n) __________.
A. syntax
error B. run-time error C. logic error D. hidden error
[B]
9. Invoking
a method means
A. checking
the method for errors B. designing the method
C. asking
the method to do its job D. revising the method
[C]
10. In
Java, a library of classes is called
A. a
folder B. a package C. a directory D. an
application
[B]
11. Which
of the following is a variable declaration?
A. "Enter number of
apples:"
B. totalFruitCount =
appleCount + orangeCount;
C. System.exit(0);
D. int appleCount;
[D]
Chapter 2
Fill
in the Blank Questions
1. Every
variable in Java must be __________ before it is used.
[declared]
2. Single
quotes are used with constants of the __________ type.
[char]
3. __________
is the integer type you should use if you're not sure which one is best.
[int]
4. An
assignment statement always has a single __________ on the left side of the
assignment operator.
[variable]
5. A(n)
__________ is used to change the type of a value.
[type cast]
6. The
value of 42
% 10 is __________.
[2]
7. Double
quotes are used with constants of the __________ type.
[String]
8. The
__________ operator is used to connect two strings to make one longer string.
[concatenation or +]
9. To
include a double quote inside a character string, you must use a(n) __________
character.
[escape]
10. readChar
and ReadLineLong are two methods in the __________ class.
[SavatchIn]
11. __________
should explain non-obvious aspects of a program and should not be redundant
with the code.
[comments]
12. Using
__________ variable names helps make a program self-documenting.
[meaningful]
True/False
Questions
1. An
upper-case letter is considered to be the same character as a lower-case letter
in Java.
TRUE FALSE
[FALSE]
2. The
boolean type has only two values.
TRUE FALSE
[TRUE]
3. A
variable can appear on both sides of the assignment operator in the same
assignment statement.
TRUE FALSE
[TRUE]
4. 3.65e2
is a legal integer constant in Java.
TRUE FALSE
[FALSE]
5. Use
of a type cast sometimes causes values to be rounded.
TRUE FALSE
[FALSE]
6. A
single declaration can include both initialized and uninitialized variables.
TRUE FALSE
[TRUE]
7. Arithmetic
with floating-point numbers is not exact.
TRUE FALSE
[TRUE]
8. The
value of 5 / 2 and the value of 5.0 / 2 are the same.
TRUE FALSE
[FALSE]
Multiple-Choice
Questions
1. Which
of the following is a class type?
A. int B. double C. char D. String
[D]
2. Which
of the following is not an integer type?
A. double B. short C. byte D. int
[A]
3. Which
of the following is a correct statement in Java?
A. apes
= monkeys + gorillas
B. tigers
= 3
C. lions
+ tigers = cats;
D. zebras
+= 5;
[D]
4. println
is a method used with __________
A. objects
of the String class B. the System.in object
C. the
System.out object D. the SavatchIn class
[C]
5. Which
of the following assignments would not be allowed without a typecast?
A. assigning
a short value to a long variable
B. assigning
a byte value to a double variable
C. assigning
an int value to a float variable
D. assigning
a double value to a long variable
[D]
6. Which
of the following operators has the highest precedence?
A. unary
+ B. binary + C. % D. *
[A]
7. In
which expression could the parentheses be removed without changing the value of
the expression?
A. x
* (y + z) B. (w – x) / 3
C. x
* 3 /(y + 2) D. (y
% 3) + 2
[D]
8. Which
statement best describes the statement: x++;
A. It
is incomplete and will cause a compiler error message if not modified.
B. It
will add 1 to the value of x.
C. It
will add 2 to the value of x.
D. It
will make the new value of x be the absolute value of the old value of x.
[B]
9. The
characters // in a line
A. are
part of an expression that uses integer division
B. are
part of an expression that uses integer division
C. mean
that the rest of the line is a comment
D. are
an escape sequence
[C]
10. A
number like 60 in a program should
A. be
replaced with a variable that has the same value
B. be
replaced with a named constant
C. be
explained by a comment
D. be
written as '60' if used as an integer
[B]
Chapter 3
Fill
in the Blank Questions
1. An
! in an expression means __________.
[not]
2. A
list of statements enclosed in curly brackets is called a(n) __________.
[compound statement]
3. A
case label is used with a(n) __________ statement.
[switch]
4. A(n)
__________ statement in a loop will cause the program to immediately exit the
loop.
[break]
5. A(n)
__________ is used for signaling the end of the input.
[sentinel value]
True/False
Questions
1. Every
statement with if must also include else.
TRUE FALSE
[FALSE]
2. What
is the value of the expression (x > 3) || (y < 3) if x has the value 1 and y has the value 5?
true false
[false]
3. The
== operator can be used to see if two strings have the same characters.
TRUE FALSE
[FALSE]
4. A
multibranch if-else statement is one kind of nested if-else statement.
TRUE FALSE
[TRUE]
5. The
controlling expression of a switch statement must have a value that is an
integer or a character.
TRUE FALSE
[TRUE]
6. The
body of any while loop will be executed at least once.
TRUE FALSE
[FALSE]
7. for
loops and while loops use the same stopping mechanism.
TRUE FALSE
[FALSE]
8. Java
uses complete evaluation for Boolean expressions that use & instead of
&& and | instead of ||.
TRUE FALSE
[TRUE]
Multiple-Choice
Questions
1. What
will be the value of x after the following section of code executes:
int x = 5;
if (x > 3)
x
= x – 2;
else
x
= x + 2;
A. 1 B. 3 C. 5 D. 7
[B]
2. What
will be the value of y after the following section of code executes:
int y = 4, z = 3;
if (y > 4)
{
z
= 2;
y
= y – 1;
}
else
z
= 1;
y = z;
A. 1 B. 2 C. 3 D. 4
[A]
3. What
will be the value of w after the following section of code executes:
int w = 4, q = 3;
if (q > 5)
if
(w == 7)
w
= 3;
else
w
= 2;
else
if
(w > 3)
w
= 1;
else
w
= 0;
A. 0 B. 1 C. 2 D. 3
[B]
4. What
will be the value of b after the following section of code executes:
int a = 4, b = 0;
if (a < 5)
b
= 4;
else if (a < 10)
b
= 3;
else if (a > 5)
b
= 2;
else
b
= 1;
A. 1 B. 2 C. 3 D. 4
[A]
5. What
will the following code print?
int color = 3;
switch (color)
{
case 1:
case 2:
System.out.print("red
");
case 3:
System.out.print("blue");
break;
case 4:
System.out.print("purple");
break;
default:
System.out.print("gray");
}
A. red B. blue C. purple
D. gray E. red
blue
[B]
6. What
will the following code print?
int count = 1;
while (count <= 3)
{
System.out.print(count
+ " ");
count++;
}
A. 1
2 3 B. 1
2 C. 3 D. 1
1 1
[A]
7. What
will the following code print?
int count;
for (count = 4; count > 1;
count--)
System.out.print(count
+ " ");
A. 1
2 3 4 B. 1
2 3 C. 4
3 2 D. 4
3 2 1
[C]
Chapter 4
Fill
in the Blank Questions
1. A(n)
__________ is an action that an object can take and is specified in the class
definition.
[method]
2. Compiling
a file called Game.java will produce a file called __________.
[Game.class]
3. A(n)
__________ is a data item that belongs to an object.
[instance variable]
4. __________
is the word used to say that there are no restrictions on the use of a method
or data item can be used.
[public]
5. The
reserved word __________ can be used as a name for the calling object.
[this]
6. Names
of mutator methods usually begin with __________.
[set]
7. The
interface of a class consists of comments, __________, and defined constants.
[headings of public methods]
8. To
create an object of a class type, the word __________ is used.
[new]
9. One
kind of method returns a value. The
other kind of method is called a(n) __________.
[void-method]
True/False
Questions
1. All
objects of the same class have the same data values.
TRUE FALSE
[FALSE]
2. When
a method call is executed, values from the method definition are substituted
for the arguments in the method call.
TRUE FALSE
[FALSE]
3. Parameters
of a primitive type are passed to methods using the call-by-value mechanism.
TRUE FALSE
[TRUE]
4. Encapsulation
is the process of defining a class that has no public methods.
TRUE FALSE
[FALSE]
5. Private
methods are part of the interface of a class.
TRUE FALSE
[FALSE]
6. A
variable of class type does not store an object of that class.
TRUE FALSE
[TRUE]
7. An
equals method should return a boolean value.
TRUE FALSE
[TRUE]
8. A
method can change the value of a variable of a primitive type that is an
argument to the method.
TRUE FALSE
[FALSE]
9. A
method can change the value of instance variables of an argument that is of a
class type.
TRUE FALSE
[TRUE]
Multiple-Choice
Questions
1. A
method is invoked by
A. writing
the name of the method followed by a colon and the name of the calling object
B. writing
the name of the calling object followed by a dot and a list of values in
parentheses
C. listing
the name of the calling object and the name of the method inside parentheses
D. writing
the name of the calling object, followed by a dot, followed by the name of the
method and a list of values in parentheses
[D]
2. What
can you tell about the method surpriseMe in the code below?
int something;
something = surpriseMe();
A. It
has no parameters but has a return value.
B. It
has one parameter but no return value.
C. It
has no parameters and it has no return value.
D. It
has one return value and an unknown number of parameters.
E. It
has one parameter and an unknown number of return values.
[A]
3. A
data item that can only be used within a method is called
A. a
local variable B. an instance variable
C. a
global variable D. a private variable
[A]
4. Normally
all instance variables are given the qualifier
A. public B. protected C. private D. static
[C]
5. One
benefit of encapsulation is
A. the
implementation of the class will be smaller
B. the
implementation can be changed without changing programs that use the class
C. the
interface of the class will be smaller
D. the
interface can be changed without changing programs that use the class
[B]
6. When
comparing two objects to see if they have the same contents, one should
A. use
the = operator
B. use
the == operator
C. define
an equals method in the class and use it
D. use
the equals method to see if they have the same variable name
[C]
Chapter 5
Fill
in the Blank Questions
1. A
__________ method is a method that can be invoked using the class name instead
of an object name.
[static]
2. The
method used to convert from Character to char is __________.
[charValue]
3. The
method used to convert from String to Float is __________.
[parseFloat]
4. A(n)
__________ is a simplified version of a method that is easily verified and is
used for testing.
[stub]
5. In
the technique of __________ design, the problem of designing a method is
divided into subproblems, which are then solved using the same technique.
[top-down]
6. A(n)
__________ is a special kind of method used to initialize objects.
[constructor]
7. A(n)
__________ is a collection of related classes that serves as a class library.
[package]
True/False
Questions
1. The
object and dot can be omitted in a non-static method call if the calling object
is the this parameter.
TRUE FALSE
[TRUE]
2. Instance
variables cannot be referenced in the definition of any static method unless an
object and dot precede the variable name.
TRUE FALSE
[TRUE]
3. Java
will use automatic type conversion before it will use overloading.
TRUE FALSE
[FALSE]
4. It
is possible to have two methods in the same class that have the same name, the
same number and types of arguments, but different return types.
TRUE FALSE
[FALSE]
5. A
program will not run if more than one class in the program has a main method.
TRUE FALSE
[FALSE]
6. Constructors
have return type void.
TRUE FALSE
[FALSE]
7. A
class may have more than one constructor.
TRUE FALSE
[TRUE]
Multiple-Choice
Questions
1. The
method __________ in the Math class returns the nearest whole number that is
equal to or less than its argument.
A. abs B. min C. round D. floor
[D]
2. Which
of these words is the name of a wrapper class?
A. int B. float C. Double D. String
[C]
3. The
term overloaded refers to
A. an
error where more than one method matches a method call
B. two
or more methods in the same class that have the same name
C. method
calls where there are two many actual parameters
D. two
or more methods in different classes that have the same name
[B]
4. Java
will automatically define a constructor
A. if
the programmer does not define a default constructor for a class
B. if
the programmer does not define any constructors for a class
C. if the program refers to a constructor with no
parameters
D. for
every class defined in a program
[B]
5. A
private instance variable
A. can
never be modified by a method outside the class
B. can
be modified by a method outside the class if it is returned by a method
C. can
be modified by a method outside the class if it is a class type (with a mutator
method) and is returned by a method
D. can
be modified by using an object name followed by a dot and then the name of the
instance variable
[C]
6. The
name of a constructor
A. can
be any legal identifier
B. must
include the name of the package
C. will
always be the word new
D. will
always be the same as the name of the class
[D]
Chapter 6
Fill
in the Blank Questions
1. The
type of elements in an array is called the __________.
[base type]
2. Every
array object has an instance variable called __________ that tells how many
elements are in the array.
[length]
3. An
array can be initialized by enclosing a list of values in __________.
[curly brackets]
4. When
a program looks at array elements in order from first to last to find a value,
it is using the __________ algorithm.
[sequential search]
5. An
array that uses more than one index is called a(n) __________ array.
[multidimensional]
6. The
parameter to main is a(n) __________.
[array of Strings]
7. A
two-dimensional array is implemented as a(n) __________.
[array of arrays]
True/False
Questions
1. All
data stored in an array must be the same type.
TRUE FALSE
[TRUE]
2. The
index to use with an array can be an expression whose value is computed when
the program runs.
TRUE FALSE
[TRUE]
3. If
one element from an array is passed as a parameter to a method, then the called
method can modify any element in the array.
TRUE FALSE
[FALSE]
4. Every
array has a method called equals that can be used to compare it to other
arrays.
TRUE FALSE
[FALSE]
5. An
accessor method that returns an array should return a copy of an instance
variable array rather than the instance variable itself.
TRUE FALSE
[TRUE]
6. In
a two-dimensional array, all of the rows must have the same number of elements.
TRUE FALSE
[FALSE]
7. The
size of an array in Java is determined when the program is compiled.
TRUE FALSE
[FALSE]
Multiple-Choice
Questions
1. The
lowest index that can be used with an array
A. is
zero
B. is
one
C. is
determined by the array declaration
D. changes
as the program runs
[A]
2. The
highest index that can be used with an array
A. is
the number of elements in the array
B. is
the number of elements in the array minus one
C. is
determined by the array declaration
D. changes
as the program runs
[B]
3. What
will happen if a program uses an array index that is out of bounds?
A. The
compiler will give an error message and will not compile the program.
B. The
compiler will give a warning but will still compile the program.
C. The
program will compile but Java will give an error message when the program runs.
D. The
program will compile and run with no error messages but might give incorrect
results.
[C]
4. Which
statement best describes an array of
10 elements where the elements are of class String?
A. 10
String objects will be created when the array is created.
B. 10
String objects must be created before the array is created.
C. The
array will be created with the elements equal to null.
D. Elements
of an array cannot be a class type.
[C]
5. Selection
sort works by repeatedly
A. using
the position of elements to split the list into two sublists of equal size
B. finding
the smallest element in the remainder of the list and moving it forward
C. comparing
adjacent elements in the list and swapping them if they are out of order
D. using
a threshold value to split the list into two sublists where one sublist's
elements are greater than the threshold and the other sublist's elements are
less than the threshold
[B]
6. Which
of the following is correct Java code?
A. int[10]
list; B. int list[10]; C. int list = new int[10];D. int[] list = new int[10];
[D]
