Question

I have ArrayList of Strings. I need to randomize it by “hash number”.
Example:

ArrayList: “Word”, “Simple”, “Another”, “Demo”
hash: 1234567

As a result of randomizing I want to receive say: “Simple”, “Word”, “Demo”, “Another”

with other hash: 542345 I want to receive say: “Word”, “Another”, “Demo”, “Simple”

But the requirements is that that when I always sort by this hash the randomizing order will always be THE SAME for that HASH.

Any suggestions? Adviscs?

Answer 1

You can shuffle a List using a Random object that you initialize with the hash.

Collections.shuffle( myList, new Random(12345) );

When the same hash is used to seed the Random object, the shuffle order should turn out the same.