Question

List<Data> list = new ArrayList<Data>();

public class Data{
    public int n;
    public String p;

    public Data(int N, String P) {
        n = N;
        p = P;
    }

}

How can i shuffle the Integer of the Object: Data. So the String stays at the same position, and the Integer get’s shuffled.

Answer 1

Loop through list and store the int of each Data object in a separate list. Shuffle this list using Collections.shuffle(...). Loop through this new shuffled list and set the n field of each corresponding member of list to the new random int found in the shuffled list.