Question 1

All import declarations must be placed ____________.

Accepted Answer

before the class declaration.

Question 2

Which of the following segments is a proper way to call the method readata four time?

Accepted Answer

int i = 0;
while(i < 4)
{
  readData();
  i = i + 1;
}

Question 3

Which command executes the Java class file Welcome.class: ____________

Accepted Answer

java Welcome

Question 4

What does the expression x %= 10 do?

Accepted Answer

Divides x by 10 and stores the remainder in x.

Question 5

End-of-line comments that should be ignored by the compiler are denoted using

Accepted Answer

Two forward slashes

Question 6

_______ models software in terms similar to those that people use to describe real-world objects.

Accepted Answer

Object-oriented design

Question 7

Which command compiles the Java source code file Welcome.java

Accepted Answer

javac Welcom.java

Question 8

Which statement is true (regard syntax)

Accepted Answer

Syntax errors are caught by the compiler. Logic errors have effects at execution time.

Question 9

Every Java application is composed of at least one:

Accepted Answer

public class declaration.

Question 10

What is the difference between a float and a double:

Accepted Answer

Double variables store numbers with larger magnitude and finer detail.

Question 11

Which of the following is not one of the three general types of computer languages?

Accepted Answer

Spoken languages

Question 12

Which of the following is not a Java keyword?

Accepted Answer

Question 13

What is the result value of c at the end of the following code segment:

int c = 8;
c++ 
++c
c %= 5;

Accepted Answer

0

Question 14

A(n) __________ enables a program to read data from the user.

Accepted Answer

Scanner

Question 15

Which of the following is not one of six logical units of a computer?

Accepted Answer

Printer

Question 16

Which of the following is not a Java primitive type?

Accepted Answer

real

Question 17

Attributes of a class are also known as:

Accepted Answer

Fields

Question 18

Which of the following statements about the break statement is false?

Accepted Answer

The break statement when executed in a while, for or do...while, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.

Question 19

Which of the following will count down from 10 to 1 correctly(for loop)?

Accepted Answer

for ( int j = 10; j >= 1; j--)

Question 20

Consider the code segment below:
if ( gender == 1 )
{
  if ( age >= 65 )
    ++seniorFemales;
} //end if

The segment is equivalent to what? (using Logical operators)

Accepted Answer

if( gender == 1 && age >= 65)
  ++seniorFemales;

Question 21

Suppose the variable gender is MALE and age equals 60, how is the expression (gender == FEMALE) && (age >= 65) evaluated?

Accepted Answer

The condition ( gender == FEMALE ) is evaluated first and the evaluation stops immediately

Question 22

To exit out of a loop completely, and resume the flow of control at the next line in the method, use __________.

Accepted Answer

a break statement.

Question 23

Which of the following statements about the continuation statement is true?

Accepted Answer

A continue statement proceeds with the next iteration of the immediately enclosing while, for, do...while statement.

Question 24

The control variable of a counter-controlled loop should be declared as ______ to prevent errors.

Accepted Answer

int

Question 25

Which of the following statements about a do...while repetition statement is true?

Accepted Answer

The body of a do...while loop is always executed at least once.

Question 26

A well-designed method

Accepted Answer

performs a single, well-defined task

Question 27

Which statement creates a random value from the sequence 2, 5, 8, 11, and 14. Suppose randomNumbers is a Random object

Accepted Answer

2 + 3 * randomNumbers.nextInt(5)

Question 28

To declare a method as static, place the keyword static before _________ in the method's declaration.

Accepted Answer

the return type.

Question 29

Suppose method1 is declared as 
void method1( int a, float b)
Which of the following methods correctly overloads method 1?

Accepted Answer

void method1( float a, int b).

Question 30

In a class containing methods with the same name, the methods are distinguished by:

Accepted Answer

parameter number, types, and order of types.

Question 31

Consider the following Java statements:

int x = 9;
double 7 = 5.3;
result = calculateValue(x , y);

Are x and y parameters?

Accepted Answer

False

Question 32

the Java API consists of import declarations

Accepted Answer

False

Question 33

An overloaded method is one that:

Accepted Answer

has the same name as another method, but different parameters (by number or types or order of types)

Question 34

Stacks are known as ________ data structures.

Accepted Answer

LIFO

Question 35

Declaring main as _______ allows the JVM to invoke main without creating an instance of the class.

Accepted Answer

static

Question 36

A programmer must do what before using an array:

Accepted Answer

Declare then create the array

Question 37

Which method call converts the value in variable stringVariable to an integer?

Accepted Answer

Integer.parseInt( stringVariable ).

Question 38

What do the following statements do?

double[] array;
array = new double[ 14 ];

Accepted Answer

Create a double array containing 14 elements.

Question 39

Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.

Accepted Answer

takeArray( items )

Question 40

In this question, assume a class, Book, has been defined. Which set of statements creates an array of Book objects?

Accepted Answer

Book[] books;
books = new Book[ numberElements ];

Question 41

Arrays are:

Accepted Answer

fixed-length entities.

Question 42

The preferred way to traverse a two-dimensional array is to use

Accepted Answer

two nested for statements

Question 43

Attempting to access an array element out of the bounds of an array, causes a(n)

Accepted Answer

ArrayIndexOutOfBoundsException.

Question 44

Consider the array:

s[ 0 ] = 7
s[ 1 ] = 0
s[ 2 ] = -12
s[ 3 ] = 9
s[ 4 ] = 10
s[ 5 ] = 3
s[ 6 ] = 6

The value of s[ s[ 6 ] - s[ 5 ] ] is:

Accepted Answer

9

Question 45

Which of the following should usually be private?

Accepted Answer

Variables (or fields).

Question 46

Static class variables:

Accepted Answer

are shared by all objects of a class.

Question 47

When should a program explicitly use the this reference?

Accepted Answer

Accessing a field that is shadowed by a local variable.

Question 48

The import declaration import *; ________.

Accepted Answer

causes a compilation error.

Question 49

Instance variables declared final do not or cannot:

Accepted Answer

Be modified.

Question 50

Having a this reference allows:

Accepted Answer

All of the above.

Question 51

Which of the following is false? (Objects and finalize)

Accepted Answer

Objects are marked for garbage collection by method finalize.

Question 52

When no access modifier is specified for a method or variable, the method or variable:

Accepted Answer

Has package access.

Question 53

A class within a package must be declared public if

Accepted Answer

It will be used by classes that are not in the same package.

Question 54

Which superclass members are inherited by all subclasses of that superclass?

Accepted Answer

protected instance variables and methods

Question 55

Every class in Java, except ________, extends an existing class.

Accepted Answer

Object

Question 56

Superclass methods with this level of access cannot be called from subclasses.

Accepted Answer

private

Question 57

When a subclass constructor calls its superclass constructor, what happens if the superclass’s constructor does not assign a value to an instance variable?

Accepted Answer

The program compiles and runs because the instance variables are initialized to their default values

Question 58

Overriding a method differs from overloading a method because:

Accepted Answer

Overridden methods have the same signature.

Question 59

Which of the following keywords allows a subclass to access a superclass method even when the subclass has overridden the superclass method?

Accepted Answer

super

Question 60

Using the protected keyword gives a member:

Accepted Answer

package access

Question 61

Failure to prefix the superclass method name with the keyword super and a dot (.) separator when referencing the superclass’s method causes ________.

Accepted Answer

infinite recursion

Question 62

An advantage of inheritance is that:

Accepted Answer

Objects of a subclass can be treated like objects of their superclass.

Question 63

The default implementation of method clone of Object performs a ________.

Accepted Answer

shallow copy

Question 64

The preferred means of creating multithreaded Java applications is by implementing the ______ interface. An object of a class that implements the interface represents a task to perform.

Accepted Answer

Runnable

COP 3352: Final

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