layeredtask1.md

Follow Layered Architecture

Customer{

id: int

name: string,

age :int

}

ICustomerDao{

add(customer:Customer)

update(customer: Customer)

findById(int id) : Customer

}

ICustomerService{

add(name, age)

changeAge(int cid, int age)

findById(int cid);

}

To Do

1. Add customer in store
2. Change customer age
3. find customer by id
4. fetch all customers

validations on id, name ,age id can't be -ve, name cant be empty or null , age can't be smaller than 18