Java get random class

Question

I am trying to figure out an effective way of getting a random class from my project. There are nine different classes(ten including the startup), each one with a different behavior(which extend a declaratoid class that is used in the main function). I need to be able to have the function to run differently on each startup. What do I need to do? Edit:Thanks for the answer, but I am now running into another problem. I have to pass the result as the first parameter in another the function now.

You're probably looking for the reflection mechanism in Java. — Michał Szydłowski, Jan 17 '15 at 23:29

Todd · Answer 1 · 2015-01-17T23:37:36.533

3

Create a factory method that gets a random number and creates an object based on that, in a switch:

public static YourInterfaceType createRandom() {
   Random r = new Random();
   switch(r.nextInt(10)) {
       case 1: return new FirstType();
       case 2: return new SecondType();
       // etc
       default: return new LastType();
   } 
}

Edit More exact definition of words. :)

edited Jan 17 '15 at 23:37

answered Jan 17 '15 at 23:30

Todd

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Technically speaking you're not creating classes. – aioobe Jan 17 '15 at 23:33
@aioobe I took the intent to mean instances of already defined classes. If OP provides more detail and this is off the mark, I'm happy to remove it. – Todd Jan 17 '15 at 23:34
He was referring to your statement `and creates a class based on that` - not true. It's creating an instance of an existing class, not creating a class. – gknicker Jan 17 '15 at 23:36
Gah, good catch. Fixed! Thanks guys. – Todd Jan 17 '15 at 23:37
Thank you for the answer Todd. It looks exactly like what I need. – Aaron Cottrill Jan 18 '15 at 16:32

score 0 · Answer 2 · answered Jan 17 '15 at 23:32

0

you could generate a random number from 1 - 9 and use a switch statement where each case calls a different class

answered Jan 17 '15 at 23:32

Lance

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Java get random class

2 Answers2