Problem solving 3
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Problem Solving #3. ICS 201 Introduction to Computer Science. Example 1. Declare a class named Employee that contains: A String variable called Name ; A double variable named Basic_Salary ; A Char variable called Gender (‘ M ’ for Male and ‘ F ’ for Female)

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Problem Solving #3

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Problem solving 3

Problem Solving #3

ICS 201

Introduction to Computer Science


Example 1

Example 1

  • Declare a class named Employee that contains:

    • A String variable called Name ;

    • A double variable named Basic_Salary;

    • A Char variable called Gender (‘M’ for Male and ‘F’ for Female)

    • A constructor that initializes the field of the Employee class;

    • An accessor method getGender( ) that returns the gender of an employee.


Problem solving 3

class Employee {

String name ;

double Basic_Salary ;

char Gender ;

Employee (String n , double b , char G) {

name = n ;

Basic_Salary = b ;

Gender = G ;

}

char getGender(){

return Gender ;

}

}


Problem solving 3

  • Declare a derived class from Employee called Faculty that contains:

    • An Integer variable named Extra_Hours;

    • A constructor to initialize the different fields of Employee and Faculty classes;

    • A method MontlySalary( ) that returns the monthly salary of a faculty;

  • Hint: Monthly salary = Basic_Salary + Extra_hours*100


Problem solving 3

class Faculty extends Employee {

intExtra_Hours ;

Faculty (String n , double b , char G , int EA){

super(n , b , G) ;

Extra_Hours = EA ;

}

double MonthlySalary (){

return super.Basic_Salary + Extra_Hours*100 ;

}

}


Problem solving 3

  • Declare a derived class from Employee called Staff that contains:

    • An Integer variable named Rank;

    • A constructor to initialize the different fields of Employee and Staff classes;

    • MontlySalary( ) that returns the monthly salary of a staff according to the Gender;

      Hint :

      Monthly salary = Basic_Salary + 500 if Gender = ‘M’;

      Monthly salary = Basic_Salary + 300 if Gender = ‘F’;


Problem solving 3

class Staff extends Employee {

int Rank ;

Staff (String n , double b , char G , int R){

super(n , b , G) ;

Rank = R ;

}

double MonthlySalary (){

double MS=0 ;

if (super.getGender() == 'M')

MS= super.Basic_Salary + 500 ;

if (super.getGender() == 'F')

MS= super.Basic_Salary + 300 ;

return MS ;

}

}


Problem solving 3

  • Create an instance of Faculty class, initialize all the fields with appropriate values, and invoke the MontlySalary( ) method.

  • Create an instance of Staff class, initialize all the fields with appropriate values, and invoke the MontlySalary( ) method.


Problem solving 3

class Test{

public static void main(String [] a){

Faculty F = new Faculty("xxxx" , 1220.5,'F',10) ;

System.out.println("The monthly salary of the faculty xxxx is " +F.MonthlySalary()) ;

Staff S = new Staff("yyyy" , 1350.5,'M',1) ;

System.out.println("The monthly salary of the staff yyyy is " +S.MonthlySalary()) ;

}

}


Example 2

Example 2

  • Consider the class named Book that contains:

    • A private String variable called title;

    • A private integer variable called nbpages;

    • A public double variable called price ;

    • Two public methods SetTitle() and SetNbpages();

    • Two public methods getTitle() and getNbpages();

  • Class TextBook is a derived class from the class Book. It contains:

    • A protected integer variable called gradeLevel;

    • A public method toString() that returns a description of a textBook;

    • A public method PriceAfterDiscount() that returns the price of a book after applying a discount of 10%.

  • Question: Establish the UML diagram for this problem.


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