Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Chapter 2, Problem 16E
Explanation of Solution
Null values:
- The null values are used to indicate that the value is not present in the current location.
- The null values can be indicated by a space or zero or any other default value.
- If a field contains null value means that content of the cell is unknown at the time of looking at it.
- For example, an employee whose address has changed and the new address is not yet known. So this address should be indicated using a null value...
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In java
KeanPerson
#keanld:int
#keanEmail:String
#firstName:String
#lastName: String
KeanAlumni
-yearOfGraduation: int
- employmentStatus: String
+ KeanPerson()
+ KeanPerson(keanld: int, keanEmail:
String, firstName: String, lastName: String)
+ getKeanld(): int
+ getKeanEmail(): String
+getFirstName(): String
+ getLastName(): String
+ setFirstName(firstName: String): void
+ setLastName(lastName: String): void
+toString(): String
+getParkingRate(): double
+ KeanAlumni()
+ KeanAlumni(keanld: int, keanEmail: String,
firstName: String, lastName: String,
yearOfGraduation: int, employmentStatus: String)
+getYearOfGraduation(): int
+ setYearOfGraduation(yearOfGraduation: int): void
+toString(): String
+getParkingRate(): double
In this question, write Java code to Create and Test the superclass: Abstract KeanPerson and a subclass of the KeanPerson: KeanAlumni.
Task 1: Implement Abstract Class KeanPerson using UML (10 points)
• Four data fields
• Two constructors (1 default and 1 constructor with all…
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