Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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___(40) When a class is defined without a constructor, Java automatically provides a default constructor.
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- 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 Desktoparrow_forwardC++arrow_forwardJava:arrow_forward
- Problem Statement Design a Mother class that has the following member: • A virtual printInfo function that displays the class information which is the Class's name. Design a BabyA class that is derived from the Mother class. The BabyA class should have the following: • A printInfo function that overrides from the base class. The BabyA Design a BabyB class that is derived from the Mother class. The Babys class' print function should display only the class's name. class should have the following: • A print Info function that overrides from the base class. The BabyB class' print function should display only the class's name. Write a program that has an array of Mother pointers. The array elements should be initialized to Mother, BabyA, and Babys objects. The program should then step through the array with a loop and call each object's printInfo function. Partial Solution #include using namespace std; class Mother public: //declare a virtual function } { { { class } } void printInfo()...arrow_forwardTrue or False 1) After a user defines his/her own constructor in a Java class, the default constructor is still available. ___(2) Java supports multiple inheritances directly. ___(3) Some methods in an interface can have method body.arrow_forwardC++arrow_forward
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