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copied!<p>Use polymorphism and generics, as Java intended. </p> <p>Polymorphism lets you call a method on your object that behaves differently for every type. The easiest way to achieve this is to provide an abstract method in the base class <code>MasterClass</code> and then override it with different functionality in every extended class. You are probably looking for something like this:</p> <pre><code>class MasterClass { int age; // ... public abstract void doWork(); public int getAge() { return age; } // .. more methods } class User extends MasterClass { // customize User here @Override public void doWork() { /* User does work in some way */ } } class Customer extends MasterClass { // customize Customer here @Override public void doWork() { /* Customer does work in some other way */ } } // ... </code></pre> <p>If you are not too familiar with <a href="http://en.wikipedia.org/wiki/Object-oriented_programming" rel="nofollow noreferrer">OOP</a>, <a href="http://docs.oracle.com/javase/tutorial/java/concepts/" rel="nofollow noreferrer">here</a> is a good introductory tutorial.</p> <p>If you are not allowed to alter your classes, you can populate a look-up table like <code>HashMap<Class, MyFunctor></code> where you can assign a different <a href="https://stackoverflow.com/questions/7369460/help-with-understanding-a-function-object-or-functor-in-java">functor</a> for every type of person you have.</p> <p>Also, you might want to use <a href="http://en.wikipedia.org/wiki/Generics_in_Java" rel="nofollow noreferrer">generics</a>. Generics allow you to capture and restrict the type of objects passed to your methods.</p>

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