BioMed Tech Exam Review

1
BioMed Tech Exam Review

• Chapter 4

2

• The behavior of an object is defined by the
  objects
• instance data
• constructor
• visibility modifiers
• methods
• all of the above

3

• The relationship between a class and an object is
  best described as
• classes are instances of objects
• objects are instances of classes
• objects and classes are the same thing
• classes are programs while objects are variables
• objects are the instance data of classes

4

• To define a class that will represent a car,
  which of the following definitions is most
  appropriate?
• private class car
• public class car
• public class Car
• public class CAR
• private class Car

5

• Which of the following reserved words in Java is
  used to create an instance of a class?
• class
• public
• public or private, either could be used
• import
• new

6

• In order to preserve encapsulation of an object,
  we would do all of the following except for which
  one?
• Make the instance data private
• Define the methods in the class to access and
  manipulate the instance data
• Make the methods of the class public
• Make the class final
• All of the above preserve encapsulation

7

• If a method does not have a return statement,
  then
• it will produce a syntax error when compiled
• it must be a void method
• it can not be called from outside the class that
  defined the method
• it must be defined to be a public method
• it must be an int, double, or String method

8

• Consider a sequence of method invocations as
  follows main calls m1, m1 calls m2, m2 calls m3
  and then m2 calls m4, m3 calls m5. If m4 has
  just terminated, what method will resume
  execution?
• m1
• m2
• m3
• m5
• main

9

• A variable whose scope is restricted to the
  method where it was declared is known as a(n)
• parameter
• global variable
• local variable
• public instance data
• private instance data

10

• A class constructor usually defines
• how an object is initialized
• how an object is interfaced
• the number of instance data in the class
• the number of methods in the class
• if the instance data are accessible outside of
  the object directly

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• Having multiple class methods of the same name
  where each method has a different number of or
  type of parameters is known as
• encapsulation
• information hiding
• tokenizing
• importing
• method overloading

12

• Instance data for a Java class
• are limited to primitive types (e.g., int,
  double, char)
• are limited to Strings
• are limited to objects(e.g., Strings, classes
  defined by other programmers)
• may be primitive types or objects, but objects
  must be defined to be private
• may be primitive types or objects

13

• An example of passing a message to a String where
  the message has a String parameter occurs in
  which of the following messages?
• length
• substring
• equals
• toUpperCase
• none of the above, it is not possible to pass a
  String as a parameter in a message to a String

14

• Consider a method defined with the header
  public void foo(int a, int b). Which of the
  following method calls is legal?
• foo(0, 0.1)
• foo(0 / 1, 2 3)
• foo(0)
• foo( )
• foo(1 2, 3 0.1)

15

• Consider a method defined with the header
  public void doublefoo(double x). Which of the
  following method calls is legal?
• doublefoo(0)
• doublefoo(0.555)
• doublefoo(0.1 0.2)
• doublefoo(0.1, 0.2)
• all of the above are legal except for d

16

• What is a mutator method?
• A method that modifies a value.
• A method that provides read-only access to a
  value.
• A method that has the same name, but different
  parameters, as another method.
• A method that is called when an object is first
  created.
• A method that does not return a value.

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BioMed Tech Exam Review

• Chapter 5

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• For the first four questions, assume x and y are
  String variables with x "Hello" and y null.

19

• The result of (x y) is
• true
• false
• a syntax error
• a run-time error
• x being set to the value null

20

• The result of x.length( ) y.length( ) is
• 0
• 5
• 6
• 10
• a thrown exception

21

• If the operation y "Hello" is performed, then
  the result of (x y) is
• true
• false
• x and y becoming aliases
• x being set to the value null
• a run-time error

22

• If the operation y x is performed, then the
  result of (x y) is
• true
• false
• x being set to the value null while y retains the
  value "Hello"
• y being set to the value null while x retains the
  value "Hello"
• x being set to y, which it is already since y
  x was already performed

23

• Consider the following swap method. If String x
  "Hello" and String y "Goodbye", then swap(x,
  y) results in which of the following?
• public void swap(String a, String b)
• String temp
• temp a
• a b
• b temp
• x is now "Goodbye" and y is now "Hello"
• x is now "Goodbye" and y is still "Goodbye", but
  (x ! y)
• x is still "Hello" and y is now "Hello", but (x
  ! y)
• x and y are now aliases
• x and y remain unchanged

24

• Which of the following methods is a static
  method? The class in which the method is defined
  is given in parentheses following the method
  name.
• equals (String)
• toUpperCase (String)
• sqrt (Math)
• format (DecimalFormat)
• paint (Applet)

25

• Static methods cannot
• reference instance data
• reference non-static instance data
• reference other objects
• invoke other static methods
• invoke non-static methods

26

• An object that refers to part of itself within
  its own methods can use which of the following
  reserved words to denote this relationship?
• inner
• i
• private
• this
• static

27

• Which of the following interfaces would be used
  to implement a class that represents a group (or
  collection) of objects?
• Iterator
• Speaker
• Comparable
• MouseListener
• KeyListener

28

• In order to implement Comparable in a class, what
  method(s) must be defined in that class?
• equals
• compares
• both lessThan and greaterThan
• compareTo
• both compares and equals

29

• If s is a String, and s no is performed,
  then s
• stores the String no
• references the memory location where no is
  stored
• stores the characters n, o
• stores an int value that represents the two
  characters
• stores the character n and a reference to the
  memory location where the next character, o is
  stored

30

• Assume that you are defining a class and you want
  to implement an ActionListener. You state
  addActionListener(this) in your class
  constructor. What does this mean?
• The class must import another class which
  implements ActionListener
• The class must define the method actionPerformed
• The class must define the method ActionListener
• The class must define an inner class called
  ActionListener
• The class must define the method actionPerformed
  in an inner class named ActionListener

31

• A Java program can handle an exception in several
  different ways. Which of the following is not a
  way that a Java program could handle an
  exception?
• ignore the exception
• handle the exception where it arose using try and
  catch statements
• propagate the exception to another method where
  it can be handled
• throw the exception to a pre-defined Exception
  class to be handled
• all of the above are ways that a Java program
  could handle an exception

32

• An exception can produce a call stack trace
  which lists
• the active methods in the order that they were
  invoked
• the active methods in the opposite order that
  they were invoked
• the values of all instance data of the object
  where the exception was raised
• the values of all instance data of the object
  where the exception was raised and all local
  variables and parameters of the method where the
  exception was raised
• the name of the exception thrown

33

• In order to have some code throw an exception,
  you would use which of the following reserved
  words?
• throw
• throws
• try
• Throwable
• goto

34

• JOptionPane is a class that provides GUI
• dialog boxes
• buttons
• output fields
• panels and frames
• all of the above

35

• A listener is an object that
• implements any type of interface
• is used to accept any form of input
• is an inner class to a class that has abstract
  methods
• waits for some action from the user
• uses the InputStreamReader class