20:38Back adjava300 18-Nov-2022 11-46-...12. Can an object be a subclass of another object?A. Yes as long as single inheritance is followed.B. No inheritance is only between classes.C. Only when one has been defined in terms of the other.D. Yes when one object is used in the constructor of another.13. What is an abstract class?A. An abstract class is one without any child classes.B. An abstract class is any parent class with more than one child class.C.An abstract class is class which cannot be instantiated.D.abstract class is another name for "base class."14. Can an abstract class define both abstract methods and non-abstract methods?A.No it must have all one or the other.B.No it must have all abstract methods.C.Yes but the child classes do not inherit the abstract methods.D.Yes the child classes inherit both.15. Can an abstract method be defined in a non-abstract class?A. No-if a class defines an abstract method the class itself must be abstract.B. No only classes are abstract, not methods.C.Yes-a method can be declared abstract in any parent as long as the child classesalso declare it abstract.Yes there is no restriction on where abstract methods can be defined.D.16. What is polymorphism in Java?A.It is when a single variable is used with several different types of related objects atdifferent places in a program.B. It is when a program uses several different types of objects, each with its ownvariable.C.It is when a single parent class has many child classes.D.It is when a class has several methods with the same name but different parametertypes.17. Given the method declaration below,public void m1 (int num1, int num2) {}which method declaration override method m1 when written in a subclass?A. public void m2 (int numl, int num2) ()B. public void m1 (int num1, double num2) ()C. public string ml (int num1, int num2, int num3) ()D. public int ml (int numl, int num2) ()LTE18. When a class implements an interface, what must it do?A. It must redefine each constant from the interface.B. It must declare and provide a method body for each method in the interface.C. It must declare a variable for each constant in the interface.D. It must include a private method for each method in the interface.19. What is the base class of nearly all Swing classes?a

12. Can an object be a subclass of another object? Inheritance occurs only between the classes and…

12. Can an object be a subclass of another object? A. Yes-as long as single inheritance is followed. B. No inheritance is only between classes. C. Only when one has been defined in terms of the other. D. Yes when one object is used in the constructor of another. 13. What is an abstract class? A. An abstract class is one without any child classes. B. An abstract class is any parent class with more than one child class. C. An abstract class is class which cannot be instantiated. D. abstract class is another name for "base class." 14. Can an abstract class define both abstract methods and non-abstract methods? A. No it must have all one or the other. B. No-it must have all abstract methods. C. Yes but the child classes do not inherit the abstract methods. D. Yes the child classes inherit both.

12. Can an object be a subclass of another object? A. Yes-as long as single inheritance is followed. B. No inheritance is only between classes. C. Only when one has been defined in terms of the other. D. Yes when one object is used in the constructor of another. 13. What is an abstract class? A. An abstract class is one without any child classes. B. An abstract class is any parent class with more than one child class. C. An abstract class is class which cannot be instantiated. D. abstract class is another name for "base class." 14. Can an abstract class define both abstract methods and non-abstract methods? A. No it must have all one or the other. B. No-it must have all abstract methods. C. Yes but the child classes do not inherit the abstract methods. D. Yes the child classes inherit both.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

20:38
Back adjava300 18-Nov-2022 11-46-...
12. Can an object be a subclass of another object?
A. Yes as long as single inheritance is followed.
B. No inheritance is only between classes.
C. Only when one has been defined in terms of the other.
D. Yes when one object is used in the constructor of another.
13. What is an abstract class?
A. An abstract class is one without any child classes.
B. An abstract class is any parent class with more than one child class.
C.
An abstract class is class which cannot be instantiated.
D.
abstract class is another name for "base class."
14. Can an abstract class define both abstract methods and non-abstract methods?
A.
No it must have all one or the other.
B.
No it must have all abstract methods.
C.
Yes but the child classes do not inherit the abstract methods.
D.
Yes the child classes inherit both.
15. Can an abstract method be defined in a non-abstract class?
A. No-if a class defines an abstract method the class itself must be abstract.
B. No only classes are abstract, not methods.
C.
Yes-a method can be declared abstract in any parent as long as the child classes
also declare it abstract.
Yes there is no restriction on where abstract methods can be defined.
D.
16. What is polymorphism in Java?
A.
It is when a single variable is used with several different types of related objects at
different places in a program.
B. It is when a program uses several different types of objects, each with its own
variable.
C.
It is when a single parent class has many child classes.
D.
It is when a class has several methods with the same name but different parameter
types.
17. Given the method declaration below,
public void m1 (int num1, int num2) {}
which method declaration override method m1 when written in a subclass?
A. public void m2 (int numl, int num2) ()
B. public void m1 (int num1, double num2) ()
C. public string ml (int num1, int num2, int num3) ()
D. public int ml (int numl, int num2) ()
LTE
18. When a class implements an interface, what must it do?
A. It must redefine each constant from the interface.
B. It must declare and provide a method body for each method in the interface.
C. It must declare a variable for each constant in the interface.
D. It must include a private method for each method in the interface.
19. What is the base class of nearly all Swing classes?
a

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