java - Non repeating random number array

Question

I need to make a typical integer filled array with 10 random non repeating numbers from 0 to 20. Also, I need to be able to modify this so I can exclude some random numbers from 0 to 20.

How can I do this?

Answer 1

You can do this in three easy steps:

1. Build a list with all the candidate numbers you want
2. Use Collections.shuffle to shuffle that list
3. Use the n first elements of that shuffled list.