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POFactory pattern generic interface with type that extends an abstract class
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  1. POFactory pattern generic interface with type that extends an abstract class
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    copied!<p>Okay, I hope I don't try to achieve the impossible here.</p> <p>I have an abstract class <code>abstract class MathFunc</code> that is used to implement the mathematical functions Rastrigin, Griewangk and Rosenbrock in their specific classes <code>final class Rastrigin extends MathFunc</code>, <code>final class Griewangk extends MathFunc</code> and <code>final class Rosenbrock extends MatjFunc</code>.</p> <p>I need a Generation class that contains an ArrayList that have to contain several objects of types Rastrigin/Griewangk/Rosenbrock. These objects should be instantiated separately from each other because Rastrigin/Griewangk/Rosenbrock generate in their constructor random numbers that are supposed to remain random. </p> <p>From my previous question <a href="https://stackoverflow.com/questions/20515026/how-to-instantiate-t-type-inside-a-template-class">here</a> I managed to implement a version that starts out fully initialized but has the same Rastrigin (for example) object repeated through the ArrayList. From the answer given there I understand that I should use the Factory pattern to instantiate every object separately. From the answer I have this chunk of code: </p> <pre><code>interface MathFuncFactory &lt;T extends MathFunc()&gt;{ T createFunc(); } </code></pre> <p>But it doesn't work. How can I implement this design properly and make it work the way I wish? Also would it be possible to instantiate an object of type T inside my Generation class ? I'm a newbie in java so detailed explanations are very appreciated. </p> <p>p.s. I made this second answer because it is not very related to the initial question which was the usage of generic classes in java.</p>
 

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