QUESTION 1 Object are just memory addresses and can be assigned to one another w

Question

QUESTION 1

Object are just memory addresses and can be assigned to one another without regard to type.

True

False

2 points   

QUESTION 2

If class D is derived from class B, we speak of D as the derived class and B as the base class.

True

False

2 points   

QUESTION 3

A programmer must have the source code for packages to extend them, even using inheritance.

True

False

2 points   

QUESTION 4

In Java, virtual functions definitions are implemented with a table look up that is done at run time from a base class object.

True

False

2 points   

QUESTION 5

One can use the this object to access variables from the object that the method is a member of.

True

False

2 points   

QUESTION 6

No objects can be defined of abstract base class type since it is an incomplete definition.

True

False

2 points   

QUESTION 7

If B is a public base class of D, then D’s members cannot invoke public members functions of B.

True

False

3 points   

QUESTION 8

If a class is named myClass, what must the constructor be named?

Any name the programmer wishes except the name of the class

None of the above

myClass()

private myClass()

public myClass()

4 points   

QUESTION 9

The first and last indexes in an array named ar are:

0 and ar.length

1 and ar.length

0 and ar.length - 1

1 and ar.length - 1

4 points   

QUESTION 10

Suppose class Child is derived from class Parent that was in turn derived from class GrandParent. When we declare an object of class Child, three constructors are called: i) Child, ii) Parent, iii )GrandParent.. What is the order?

GrandParent, Child, Parent

GrandParent, Parent, Child

Parent, GrandParent, Child

Child, Parent, GrandParent

GrandParent, Child, Parent

4 points   

QUESTION 11

Template classes such as ArrayLists may be used to make available a very large collection of _____.

basic data types

files

none of the above.

programs

objects

4 points   

QUESTION 12

How many times is the following code invoked by the call call_me(4)?

public void call_me(int i){

if (i < 8){

System.out.print(i + " ");

call_me(i--);

}

}

1

2

8

128

The int would be underflowed

This is would cause an infinite loop

4 points   

QUESTION 13

The ability to reuse objects already defined, with modification appropriate to the new purpose, is referred to as

Information hiding

Overloading

Redefinition

Inheritance

3 points   

QUESTION 14

Consider the class inheritance.

Which of the following functions can be invoked by an object of class D?

f()

g()

h()

All of the above.

None of the above

Any name the programmer wishes except the name of the class

None of the above

myClass()

private myClass()

public myClass()

Explanation / Answer

1) False. It is true that objects are just memory address. But they cannot be assigned with out regard to type.

2) True. As D is derived from B, D is the derived class and B is the base class.

3) False. The programmer can extend the class even without the knowlede of the source code of the package.

4) True. The table lookup happens at runtime.

5) True. this refers to the same object, so it can used to access methods of the same object.

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