Here is an application that stores employee object into arraylist.

import java.util.*;
abstract class  Employee
{
    int icNumber;
    String name;
    double basicSalary;
    int noOfYear;

    void setIcNumber(int icNumber){
        this.icNumber=icNumber;
    }
    void setName(String name){
        this.name=name;
    }
    void setBasicSalary(double basicSalary){
        this.basicSalary=basicSalary;
    }
    void setNoOfYear(int noOfYear){
        this.noOfYear=noOfYear;
    }
abstract double calculateBonus(double sal,int year);

}
class Cashier extends Employee{

    int icNumber;
    String name;
    double basicSalary;
    int noOfYear;
    double bonus;

Cashier(int icNumber,String name,double basicSalary, int noOfYear,double bonus){
    this.icNumber=icNumber;
    this.name=name;
    this.basicSalary=basicSalary;
    this.noOfYear=noOfYear;
    this.bonus=bonus;
}
Cashier(){}

public int getIcNumber(){
    return icNumber;
}
public String getName(){
    return name;
}
public double getBasicSalary(){
    return basicSalary;
}
public int getNoOfYear(){
    return noOfYear;
}
public double getBonus(){
    return bonus;
}
 double calculateBonus(double sal,int no){
int y=no/2;
double b=sal*0.15*y;
return b;
}
}
class Supervisor extends Employee{
int icNumber;
    String name;
    double basicSalary;
    int noOfYear;
    double bonus;

Supervisor(int icNumber,String name,double basicSalary, int noOfYear,double bonus){
    this.icNumber=icNumber;
    this.name=name;
    this.basicSalary=basicSalary;
    this.noOfYear=noOfYear;
    this.bonus=bonus;
}
Supervisor(){}
public int getIcNumber(){
    return icNumber;
}
public String getName(){
    return name;
}
public double getBasicSalary(){
    return basicSalary;
}
public int getNoOfYear(){
    return noOfYear;
}
public double getBonus(){
    return bonus;
}

 double calculateBonus(double sal,int no){
double b=sal*0.25*no;
return b;
}
}

continue..

class Supermarket{
    public static void main(String[]args){
ArrayList<Cashier> list1=new ArrayList<Cashier>();
ArrayList<Supervisor> list2=new ArrayList<Supervisor>();
Cashier ch=new Cashier();
Supervisor sv=new Supervisor();
list1.add(new Cashier(11,"A",20000,4,ch.calculateBonus(20000,4)));
list1.add(new Cashier(12,"B",25000,2,ch.calculateBonus(25000,2)));
list2.add(new Supervisor(13,"C",5000,2,sv.calculateBonus(5000,2)));
list2.add(new Supervisor(14,"D",15000,6,sv.calculateBonus(15000,6)));
boolean exit=false;
Scanner input=new Scanner(System.in);
do{
System.out.println("1 Add Employee");
System.out.println("2 Delete Employee");
System.out.println("3 Display Report");
System.out.println("4 Exit");

System.out.print("Enter your choice: ");
int choice=input.nextInt();
switch(choice){
case 1: 
    System.out.println("Enter IC Number: ");
    int no=input.nextInt();
    System.out.println("Enter Name: ");
    String name=input.next();
    System.out.println("Enter Basic Salary: ");
    double basic=input.nextDouble();
    System.out.println("Enter No of Year: ");
    int y=input.nextInt();
    System.out.println("Enter Employee type(Cashier/Supervisor): ");
    String type=input.next();
    if(type.equals("Cashier")){
        list1.add(new Cashier(no,name,basic,y,ch.calculateBonus(basic,y)));
    }
    else if(type.equals("Supervisor")){
        list2.add(new Supervisor(no,name,basic,y,sv.calculateBonus(basic,y)));
    }
    break;

case 2:
    System.out.println("Enter IC Number to delete: ");
    int n=input.nextInt();
     System.out.println("Enter Employee type(Cashier/Supervisor): ");
    String t=input.nextLine();
    if(t.equals("Cashier")){
        for(Cashier c: list1){
            if(c.getIcNumber()==n){
                list1.remove(new Cashier(c.getIcNumber(),c.getName(),c.getBasicSalary(),c.getNoOfYear(),c.getBonus()));
            }
        }
    }
    else if(t.equals("Supervisor")){
        for(Supervisor s: list2){
            if(s.getIcNumber()==n){
                list2.remove(new Supervisor(s.getIcNumber(),s.getName(),s.getBasicSalary(),s.getNoOfYear(),s.getBonus()));
            }
        }
    }
    break;
case  3:
    for(Cashier c: list1){
    System.out.println(c.getIcNumber()+"\t"+c.getName()+"\t"+c.getBasicSalary()+"\t"+c.getNoOfYear()+"\t"+c.getBonus());
    }
    for(Supervisor s: list2){
    System.out.println(s.getIcNumber()+"\t"+s.getName()+"\t"+s.getBasicSalary()+"\t"+s.getNoOfYear()+"\t"+s.getBonus());
    }
    break;
case 4:
    exit=true;
System.exit(0);
break;
 }
}
while(!exit);
    }
}