Employee.java

package com.raja.oopslab.employee;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Scanner;
package com.raja.oopslab.employee;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Scanner;
class Employee {
String emp_name;
String emp_id;
String emp_address;
String emp_mail_id;
String emp_mobile_no;
int basic_pay;
int per_day_pay;
int current_basic_pay;
int da, hra, pf, gross_pay;
int net_pay;
int no_of_days_in_current_month;
int no_of_days_worked;
Calendar cal;
Scanner input;
Employee() {
input = new Scanner(System.in);
cal = new GregorianCalendar();
no_of_days_in_current_month = 
cal.getActualMaximum(Calendar.DAY_OF_MONTH);
getUserBasicDetails();
}
public void generatePaySlip() {
this.da = (this.current_basic_pay / 100) * 97;
this.hra = (this.current_basic_pay / 100) * 12;
this.pf = (int) ((this.current_basic_pay / 100) * 0.1);
this.gross_pay = this.current_basic_pay + da + hra + pf;
this.net_pay = gross_pay - pf;
}
public void displayPaySlip() {
System.out.println("Name: " + this.emp_name);
System.out.println("ID: " + this.emp_id);
System.out.println("Address: " + this.emp_address);
System.out.println("MailID: " + this.emp_mail_id);
System.out.println("Mobile No: " + this.emp_mobile_no);
System.out.println("\nEarnings");
System.out.println("--------");
System.out.println("BASIC Pay: " + current_basic_pay + " Rs");
System.out.println("DA : " + da + " Rs");
System.out.println("HRA : " + hra + " Rs");
System.out.println("\nDeductions");
System.out.println("----------");
System.out.println("PF : " + pf + " Rs");
System.out.println("GROSS Pay: " + gross_pay + " Rs");
System.out.println("NET Pay: " + net_pay + " Rs");
}
public void getUserBasicDetails() {
System.out.println("Enter Details");
System.out.println("Name: ");
this.emp_name = input.next();
System.out.println("ID: ");
this.emp_id = input.next();
System.out.println("Address: ");
this.emp_address = input.next();
System.out.println("MailID: ");
this.emp_mail_id = input.next();
System.out.println("Mobile No:");
this.emp_mobile_no = input.next();
}
public void computeCurrentBasicPay(String empType) {
this.per_day_pay = this.basic_pay / no_of_days_in_current_month;
System.out.println("\nBasic Pay of " + empType + " " + this.basic_pay + " for "
+ this.no_of_days_in_current_month + " days");
System.out.println("This month this " + empType + " gets " + this.per_day_pay + " 
INR as basic pay per day");
System.out.println("Enter no.of days worked by " + empType + " including CL, 
WH, FH and excluding LWP:");
this.no_of_days_worked = input.nextInt();
if (no_of_days_worked <= no_of_days_in_current_month) {
this.current_basic_pay = this.per_day_pay * no_of_days_worked;
System.out.println("Programmer");
System.out.println("----------");
generatePaySlip();
} else {
System.out.println("Sorry Please Enter Valid Days");
}
}
protected void finalize() {
input.close();
System.exit(0);
}
}

Programmer.java

package com.raja.oopslab.employee;
public class Programmer extends Employee {
public Programmer() {
super();
computeProgrammerPay();
}
public void computeProgrammerPay() {
System.out.println("Enter Basic pay of Programmer [enter -1 for Default [BP = 
30000]]:");
this.basic_pay = input.nextInt();
if (this.basic_pay == -1) {
this.basic_pay = 30000;
System.out.println("Default Pay Taken");
}
computeCurrentBasicPay("Programmer");
generatePaySlip();
displayPaySlip();
}
}

Assistant Professor.java

package com.raja.oopslab.employee;
public class AssistantProfessor extends Employee {
public AssistantProfessor() {
super();
computeAssistantProfessorPay();
}
public void computeAssistantProfessorPay() {
System.out.println("Enter Basic pay of AssistantProfessor [enter -1 for Default [BP 
= 25000]]:");
this.basic_pay = input.nextInt();
if (this.basic_pay == -1) {
this.basic_pay = 25000;
System.out.println("Default Pay Taken");
}
computeCurrentBasicPay("AssistantProfessor");
generatePaySlip();
displayPaySlip();
}
}

Associate Professor

package com.raja.oopslab.employee;
public class AssociateProfessor extends Employee {
public AssociateProfessor() {
super();
computeAssociateProfessorPay();
}
public void computeAssociateProfessorPay() {
System.out.println("Enter Basic pay of AssociateProfessor [enter -1 for Default [BP 
= 40000]]:");
this.basic_pay = input.nextInt();
if (this.basic_pay == -1) {
this.basic_pay = 40000;
System.out.println("Default Pay Taken");
}
computeCurrentBasicPay("AssociateProfessor");
generatePaySlip();
displayPaySlip();
}
}

Professor

package com.raja.oopslab.employee;
public class Professor extends Employee {
public Professor() {
super();
computeProfessorPay();
}
public void computeProfessorPay() {
System.out.println("Enter Basic pay of Professor [enter -1 for Default [BP = 
70000]]:");
this.basic_pay = input.nextInt();
if (this.basic_pay == -1) {
this.basic_pay = 70000;
System.out.println("Default Pay Taken");
}
computeCurrentBasicPay("Professor");
generatePaySlip();
displayPaySlip();
}
}

Main.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import com.raja.oopslab.employee.AssistantProfessor;
import com.raja.oopslab.employee.AssociateProfessor;
import com.raja.oopslab.employee.Programmer;
import com.raja.oopslab.employee.Professor;
public class Main {
public static void main(String[] args) throws IOException {
Programmer aProgrammer;
AssistantProfessor aAssistantProfessor;
AssociateProfessor aAssociateProfessor;
Professor aProfessor;
String choice;
int n_choice = 0;
Scanner userInput = new Scanner("System.in");
while (n_choice != 5) {
System.out.println("\n\nEmployee Payroll System");
System.out.println("***********************\n");
System.out.println("1. Programmer\n2. Assistant Professor\n" + "3. Associate
Professor\n4. Professor\n"
+ "5. Exit\n\nEnter Your Choice");
choice = new BufferedReader(new 
InputStreamReader(System.in)).readLine();
n_choice = Integer.parseInt(choice);
switch (n_choice) {
case 1:
System.out.println("Programmer Selected");
aProgrammer = new Programmer();
break;
case 2:
System.out.println("AssistantProfessor Selected");
aAssistantProfessor = new AssistantProfessor();
break;
case 3:
System.out.println("AssociateProfessor Selected");
aAssociateProfessor = new AssociateProfessor();
break;
case 4:
System.out.println("Professor Selected");
aProfessor = new Professor();
case 5:
System.out.println("Thank You !!!");
userInput.close();
break;
default:
System.out.println("Enter valid choice !!!");
break;
}
}
}
}