Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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1. A set of values and the
operations that can be carried out with those values are called _______.
a. | literals | c. | values | b. | numbers | d. | types |
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2.
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What is the name of the type
that denotes floating-point numbers that can have fractional parts?
a. | double | c. | int | b. | floating point | d. | integer |
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3.
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What is the name of the type
that denotes whole numbers?
a. | double | c. | whole | b. | int | d. | integer |
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4.
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Which of the following declares
a variable that will store a welcome message?
a. | String
welcome; | c. | Char
welcome; | b. | double welcome; | d. | int welcome; |
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5.
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Which term is used to describe
the name of a variable, method, or class?
a. | type | c. | identifier | b. | literal | d. | label |
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6.
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By convention, classes begin
with a(n) _____________.
a. | lowercase letter | c. | digit | b. | dollar sign | d. | uppercase
letter |
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7.
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Which statement declares and
stores an integer value in a variable?
a. | count =
5; | c. | integer count =
5; | b. | int count =
5; | d. | String count =
5; |
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8.
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Assume that the variable count
has been declared as type int. Which statement adds 10 to count?
a. | count =
10; | c. | count = count +
10; | b. | count == count + 10; | d. | count + 10; |
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9.
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Which of the following code
fragments will cause an error?
a. | String greeting = "Hello,
Dave!"; | c. | int
luckyNumber; System.out.println(luckyNumber); | b. | String greeting = "Hello, World!"; int n =
greeting.length(); | d. | PrintStream printer =
System.out; |
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10.
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What is an
object?
a. | A sequence of
instructions. | c. | An entity in your
program that is manipulated by calling methods. | b. | Any value stored in a
variable. | d. | Any input to a
method. |
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11.
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What is the type of an
object?
a. | variable | c. | method | b. | reference | d. | class |
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12.
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Which of the following
statements about methods is correct?
a. | A method is a sequence of
instructions that could access the data of an object | c. | A method can be called on any object in any
class. | b. | A method name is unique across the entire
program. | d. | Methods are stored in
variables. |
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13.
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Which is not a method of the
String class?
a. | length | c. | toLowerCase | b. | toUpperCase | d. | println |
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14.
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Which method call represents
the invocation of a method that does not have explicit parameters?
a. | greeting.replace("Hello",
"Welcome"); | c. | greeting.length() | b. | greeting.length | d. | System.out.println(greeting); |
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15.
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The output of a method is
called its __________ value.
a. | implicit | c. | parameter | b. | explicit | d. | return |
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16.
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Which of the following method
calls illustrates the return value of a method as a parameter?
a. | greeting.length(); | c. | System.out.println(length.greeting()); | b. | greeting.println("Hello"); | d. | System.out.println(greeting.length()); |
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17.
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What terminology describes a
method that returns information about its implicit parameter and does not change the parameter's
internal data?
a. | mutator | c. | void | b. | accessor | d. | public |
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18.
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Which of the following is a
mutator method for the Rectangle class?
a. | getHeight | c. | getWidth | b. | translate | d. | isEmpty |
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19.
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A _____________ is a collection
of classes with a related purpose.
a. | package | c. | method | b. | import | d. | collection |
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20.
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Which package is automatically
imported in any Java program?
a. |
java.system | c. | java.language | b. | java.lang | d. | java.util |
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21.
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Which method checks whether a
point lies within the rectangle?
a. | add | c. | translate | b. | getBounds | d. | contains |
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22.
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Which method would you use to
obtain the string "1234567890" from the string
"123-456-7890"?
a. | isEmpty | c. | trim | b. | replace | d. | length |
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23.
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Which of the following terms
denotes the memory location of an object?
a. | implicit
parameter | c. | encapsulation | b. | mutator method | d. | object reference |
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24.
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What do object variables
store?
a. | objects | c. | references | b. | classes | d. | numbers |
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25.
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Assuming the following Java
statement:
int num = 10;
What does the variable num store?
a. | A reference to the memory location
where the value 10 is stored. | c. | An object representing the number 10. | b. | A reference to the int primitive
type. | d. | The numeric value
10. |
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26.
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What is the output of the
following code:
Circle c1 = new Circle(3);
Circle c2 =
c1;
c1.setRadius(4);
System.out.println(c2.getRadius());
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27.
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What is the output of the
following code:
int num1 = 6;
int num2 = num1;
num2 = num2 +
10;
System.out.println(num1);
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28.
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Complete this code fragment to
ensure that the frame is shown:
JFrame frame = new JFrame();
a. | frame.setVisible(true); | c. | JFrame.setVisible(); | b. | frame.visible = true; | d. | frame.setVisible(); |
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29.
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What is the nickname for the
graphical user interface library in Java?
a. | Applet | c. | JComponent | b. | GUI | d. | Swing |
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30.
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Place drawing instructions
inside the __________ method, which is called whenever the component needs to be
repainted.
a. | paintComponent | c. | paint | b. | draw | d. | drawComponent |
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