QUESTION 12

A subclass inherits all its data members from the superclass; it has none of its own.

True

False

QUESTION 13

Java uses late binding for methods that are private but not for methods that are marked final.

True

False

QUESTION 14

Using the mechanism of inheritance, every public member of the class Object can be overridden and/or invoked by every object of any class type.

True

False

QUESTION 15

In Java, a reference variable of a superclass type cannot point to an object of its subclass.

True

False

QUESTION 16

An abstract class can only contain abstract methods.

True

False

QUESTION 17

The class Object is directly or indirectly the superclass of every class in Java.

True

False

QUESTION 18

In Java, you can automatically make a reference variable of a subclass type point to an object of its superclass.

True

False

QUESTION 19

A subclass can have its own private data members, but a subclass cannot have its own constructors.

True

False

QUESTION 20

Suppose that the class Mystery is derived from the class Secret. The following statements are legal in Java. Secret secRef; Mystery mysRef = new Mystery(); secRef = mysRef;

True

False

QUESTION 21

Redefining a method of a superclass is also known as overloading a method.

True

False

QUESTION 22

The subclass can override public methods of a superclass.

True

False

QUESTION 23

Composition is a is-a relation.

True

False

QUESTION 24

The superclass inherits all its properties from the subclass.

True

False

QUESTION 25

An abstract method is a method that has only the heading with no body.

True

False

QUESTION 26

Every Java class (built-in or user-defined) automatically includes the method toString.

True

False

QUESTION 27

Composition is a has-a relation.

True

False

QUESTION 28

To override a public method of a superclass in a subclass, the corresponding method in the subclass must have the same name but a different number of parameters.

True

False

QUESTION 29

You can instantiate an object of a subclass of an abstract class, but only if the subclass gives the definitions of all the abstract methods of the superclass.

True

False

Inheritance implies an is-a relationship.

True

False

QUESTION 31

The private members of a superclass can be accessed by a subclass.

True

False

QUESTION 32

In Java, extends is a reserved word.

True

False

QUESTION 33

A call to the default constructor of a superclass must be the first statement in a constructor.

True

False

QUESTION 34

Inheritance implies an has-a relationship.

True

False