Answered: java language Create the inheritance…

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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java language
Create the inheritance relationship by doing base class People, derived class Student
Modify the Student constructor method to receive data from the People class as an argument.
In main modify the creation of student object using constructor to pass attributes of people and student
Modify the ShowStudent method so that it displays the People data. In main it will not be necessary

Student
+numld: int
+avg: double
+student(numld,avg)
+showStudent()

People
+firstName: String
+lastName: String
+age:int
+people(firstName,lastName,age)
+showPeople()

Expert Solution

Step 1

Program Approach:

Step 1: Create People class
Step 2: Create instance variable in People class firstName String, lastName String, age int.
Step 3: Create showPeople() method to display firstName, lastName and age.
Step 4: Create Student class and inherits People class
Step 5: People class is base class and Student class is derived class after inheritance.
Step 6: Create instance variable numId int, avg double
Step 7: Create constructor and pass same name arguments in constructor
Step 8: Call People (base class) instance variable in Student class constructor with super keyword.
Step 9: Assign class variable value of constructor arguments with this keyword
Step 10: Create showStudent() method and display numId and avg value
Step 11: Create Student class object in main method and pass arguments value to constructor
Step 12: Call showStudent() method in main
Step 13: Display both class properties in Student class.
Step 14: End of the program

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