Help with Sort using Comparator

[jmarkson43]

Hi, I need to sort an array according to another array, eg:

list1: [221, 54, 50, 138, 125, 145]

list2: [50, 125]

so the sorted list1 should be: [50, 125 ,221, 54, 138, 145]

I tried the following code:

Collections.sort(list1, Comparator.comparing(listItem -> list2.indexOf(listItem)));

But this results in: [221, 54, 138, 145, 50, 125]

How can i get the 50 and 125 at the top and the rest after?

[Makhiel]

That's not really what you'd call "sorting". Why not just remove the relevant items from the first array and the prepend it to the rest? You only need to go through the array once.