QUESTION 7 If a subclass constructor does not explicitly call a superclass constructor O it must include the code necessary to initialize the superclass fields Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor execute O Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes O the superclass fields will be set to the default values for their data types QUESTION 8 A subclass may call an overridden superclass method by prefixing its name with the name of the superclass in parentheses using the extends key word before the method is called O prefixing its name with the super key word a dot (.) calling the superclass method first and then calling the subclass method QUESTION 9 A class becomes abstract when you place the key word in the class definition. O abstract super extends

QUESTION 7 If a subclass constructor does not explicitly call a superclass constructor O it must include the code necessary to initialize the superclass fields Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor execute O Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes O the superclass fields will be set to the default values for their data types QUESTION 8 A subclass may call an overridden superclass method by prefixing its name with the name of the superclass in parentheses using the extends key word before the method is called O prefixing its name with the super key word a dot (.) calling the superclass method first and then calling the subclass method QUESTION 9 A class becomes abstract when you place the key word in the class definition. O abstract super extends

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 5RQ

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True or False:Unlike other members of a superclass, constructors of a superclass are not inherited by its subclasses. This means that you must define a constructor for a class or use the default constructor added by the compiler.
The super keyword is used in a subclass constructor to explicitly control the superclass constructor that must be invoked before the execution of the subclass constructor proceeds. * True O False
Super Class : Person Attributes : Personname , age , address Methods : Person to Set input value of Personname , age , address Display to display Personname , age , address Sub class : employee Attributes : employeeid, salary, providentfund and bonus Methods : Employee to invoke the contructor of superclass.to set the input value employeeid, salary using thr parameterized constructor Process to calculate the providentfund and bonus and return bonus using the following condition Display to invoke method of the superclass To display following detaild employeeid, salary, providentfund Driver Class : Display the person details Display the employee details Display the bonus of employee
It is not possible to call a superclass’s _ _init_ _ method from a subclass’s _ _init_ _ method. (T/F)
öclhäll daila Declare an abstract class named A that contains: 1-A private static integer variable called C 2-A private integer variable called id 3-A constructor with no argument that sets id = 4-A public method Area() that returns 1.2 5-An abstract method getName () id + C Declare a derived class from A called B that contains: 1- Two integer variables x and y 2- A constructor to initialize the fields of B class 3- Two accessor methods getx() and gety() that return the values of - An overridden method getName() that returns the name of the class and y reclare a derived class from B called Circle that contains: - A protected double variables radius - A constructor to initialize the fields of Circle - An overridden method getName() that returns the name of the class - An overridden method Area() that calculates and B classes and returns the of Circle ite a test program to invoke the different methods declared in B and Circle classes area
Object-Oriented Programming Create a Java program that has the following: Inheritance - Create a superclass and one or more subclasses that inherit properties and methods from the superclass. Polymorphism - Show polymorphism by using method overriding and method overloading. Provide an example of runtime polymorphism by creating objects of the subclasses and calling overridden methods. Encapsulation - Demonstrate the concept of encapsulation by applying access modifiers (private, protected, public) appropriately in your program. Abstraction - Utilize abstract classes and methods in your program to illustrate abstraction. Show examples of the following words: super, this, static, final (NO USE OF AI)
variables are variables that have the same name as variables that have been declared in a superclass and are declared in a subclass, respectively.
True or False ___(4) An object of a subclass can be assigned to the variable of its superclass. ___(5) The Object class is the super class of any Java class. ___(6) An interface may include variables if needed.
Inheritance The more general class is typically known as the parent class, super class, or base class. The more specific class is typically known as the child class, sub class, or derived class. The Java keyword extends allows you to indicate that one class should be the child class of the original parent class. The child will then inherit everything from the parent class, including variables and methods. {0} Online (1) Main.java x Student.java public class Main { 1 2 3 4 5 6 Run V 7 8 9 10 11 12 13 14 } public static void main(String[] args) { /* Person class example */ Person teacher = new Person(); teacher.setName("Laurel"); System.out.println(teacher); } Reid Moseley X Person.java x /* Student class example */ Student student = new Student (); student.setName("Alice"); System.out.println(student); CONSOLE SHELL Name: Laurel Name: Alice Reset to Template Open Desktop
The_ keyword is used in a subclass constructor to explicitly control the superclass constructor that must be invoked before the execution of the subclass constructor proceeds. *
To create a subclass, you use the implements keyword after the class name. O True False
True or False ___(25) Java’s constructor name is exactly the same as the class name. ___(26) Java allows multiple constructors to be defined within a class. ___(27) is-a relationship is similar to has-a relationship in Java.