android - Data set for storing objects in java -

let's have multiple objects stored:

person ------------ employee ------------ sales engineer          |                    | customer          field engineer 

so: person, customer, employee, sales engineer, field engineer.

i need keep track of of these...what best way store them? in arraylist? custom arraylist?

the way stored may affect future expansion - in future, these objects might generated fields sql server. (also, android app - factor.)

you'll want list<person>. diagram suggests inheritance, you'll want have collection of super class , let polymorphism rest.

your code can this:

list<person> people = new arraylist<person>(); // class extends person can added people.add(new customer()); people.add(new fieldengineer()); (person person : people) {     system.out.println(person); } 

your design expressed won't allow engineers customers, or sales engineers go field, that's curse of inheritance in cases yours.

a better design, if need flexibility, might keep person class , assign person role in decorator fashion.

a decorator add behavior using composition rather inheritance, this:

public class customer {      private person person;      public customer(person p) { this.person = p; }      public void buyit() { // customer here } }  public class fieldengineer {      private person person;      public fieldengineer(person p) { this.person = p; }      public void fixit() { // field engineer here } }