Final Exam

Question 1

A program that translates Java source code into a platform-independent format

Answer 1

compiler

Question 2

A program that executes Java files

Answer 2

interpreter

Question 3

You can use a Scanner object to:

Answer 3

get the next token in an input line

Question 4

Groups of related classes are organized into

Answer 4

packages

Question 5

The order of precedence, from first to last, for arithmetic operations is

Answer 5

increment, multiply, add

Question 6

A boolean operator that only evaluates the second condition when necessary is a(n)

Answer 6

short-circuit

Question 7

Modification is not a what?

Answer 7

Basic Control Structure

Question 8

The Java implementation of the case structure uses which keyword?

Answer 8

switch

Question 9

The keyword used to code a class method is

Answer 9

static

Question 10

Which statement is always optional in exception handling?

Answer 10

finally

Question 11

Which statement is required to match a try block?

Answer 11

catch

Question 12

Division by zero would be an example of which type of exception class?

Answer 12

Arithmetic

Question 13

Exception handing using the try statement is done by

Answer 13

coding a try block around the statement that may cause the exception

Question 14

An object that contains information about an error that has occurred is a(n)

Answer 14

exception

Question 15

After an exception has occurred, the remaining statement in the try block are

Answer 15

skipped

Question 16

What is the value of the variable x after the following statements have run?

int[ ] a = {1, 2, 3};
int x = 0;
for (int n : a)
x+=n;

Answer 16

6

Question 17

What is printed by the following for loop?

int[ ][ ] m = { {4, 3}, { 2, 1} };

for (int i=0; i<m.length; i++)
System.out.print (m[i][i]);

Answer 17

41

Question 18

What is the value of nums.length for the following array?

int[ ][ ] nums = { {1, 2}, {3, 4, 5}, {6, 7, 8, 9}, {10} };

Answer 18

4

Question 19

What is the value nums[1].length for the following array?

Answer 19

3

Question 20

What is the value of the variable len after the following statements have run?

String s = “abc”;
int len = s.length( );

Answer 20

3

Remember length is different than value.

Question 21

Which of the following would be most appropriate to sort an array of strings?

Answer 21

Arrays.sort( )

Question 22

Which Java keyword refers to the current object?

Answer 22

this

Question 23

Another name for an object that belongs to a particular class is a(n):

Answer 23

instance

Question 24

Class data (or fields) are typically implemented as

Answer 24

instance variables

Question 25

A class that is intentionally left incomplete and therefore cannot be instantiated is

Answer 25

abstract

Question 26

Which is the default visibility when none is stated?

Answer 26

package

Question 27

When a method is overridden, which keyword allows access to the method’s original form?

Answer 27

super

Question 28

Extending a parent class and then including a new version of its methods in the child class is

Answer 28

overriding

Question 29

Which keyword used in a class declaration to create a subclass?

Answer 29

extends

Question 30

The parent class for all other classes is

Answer 30

object

Question 31

Assuming a parent class named Product uses a constructor named Product( ), which of the following is required by the constructor for its child class?

Answer 31

super()

Question 32

Making a method abstract means that the method

Answer 32

must be overridden by a child class

Question 33

Which type of visibility allows access from everywhere?

Answer 33

public

Question 34

Which keyword is used to create a constant in Java?

Answer 34

final

Question 35

Which type of visibility does not allow methods or data to be inherited?

Answer 35

private

Question 36

What is the lower bound for an ArrayList?

Answer 36

0

Question 37

What type of visibility allows access only by other classes within the same package or by inheritance?

Answer 37

protected

Question 38

A class that cannot be extended or modified by inheritance is referred to as

Answer 38

final

Question 39

Which of the following defines a set of public methods to be implemented by a class?

Answer 39

interface

Question 40

When a class implements an interface, it must?

Answer 40

provide an implementation for each method defined by the interface

Question 41

An interface that defines specific code to implements its methods will?

Answer 41

cause a compile error

Question 42

Declaring a parameter an as interface type will?

Answer 42

allow passing any object that implements the interface

Question 43

Forgetting to implement a method required by an interface will cause?

Answer 43

cause a compile error

Question 44

When an interface inherits from other interfaces, the implementing class?

Answer 44

must implement all inherited methods as well, unless the implementing class is abstract

Question 45

When comparing abstract classes and interfaces?

Answer 45

both can use static constants

Question 46

Which type of stream is used to read and write text files?

Answer 46

character

Question 47

What do you do to append text to an existing file?

Answer 47

specify true in the FileWriter constructor

Question 48

Which method return true if the path name exists and refers to a directory?

Answer 48

isDirectory( )