Implement Fibonacci number sequence generator, both recursively and iteratively in Java.

Use two different digits, x and y (as long as both of them are not 0s), as the first and second numbers for your testing. Identify the 10th, 20th, 30th, 40th, and 50th Fibonacci numbers in your sequence along with the time taken to identify these numbers (for both iterative and recursive code). Submit these numbers and times.