Sort two arrayLists concurrently

Question

Say I have two ArrayLists:

name: [Four, Three, One, Two]
num:  [4, 3, 1, 2]

If I do: Arrays.sort(num), then I have:

name: [         


        

Answer 1

In some cases it doesn't make much sense to create a new class just to do multiple sorts based off a given list. I've created a function that does this, but I've posted the code in a another SO post so I wont repeat it. Below is an example of how to use it.

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Usage

Here is an example of how you can use the function to sort multiple lists of arbitrary types:

// The key can be any type that implements Comparable, Dupes are allowed
List key = Arrays.asList(4, 3, 1, 2, 1);

// List Types do not need to be the same
List list1 = Arrays.asList("Four", "Three", "One", "Two", "One");
List list2 = Arrays.asList('d', 'c', 'a', 'b', 'a');

// Sorts key, list1, list2 using key as the sorting key.
keySort(key, key, list1, list2);

Output:

key:   [1, 1, 2, 3, 4]
list1: [One, One, Two, Three, Four]
list2: [a, a, b, c, d]