Java Comparator.comparing not comparing?

Question

Following this question about sorting a list by another list, I tried to do the same thing - but from some reason it doesn\'t work for me. What am I missing?

Answer 1

Update

List nums = Arrays.asList(5.0, 0.9, 10.4);
List order = Arrays.asList(3.0, 1.0, 2.0);
Map numToOrder = new HashMap<>();
for (int i = 0; i < nums.size(); ++i) {
    numToOrder.put(nums.get(i), order.get(i));
}
nums.sort(Comparator.comparing(num -> numToOrder.get(num)));
System.out.println(nums);

Original (wrong) answer

(nums is modified in place, and the lambda returning key returns wrong results)

List nums = Arrays.asList(5.0, 0.9, 10.4);
List order = Arrays.asList(3.0, 1.0, 2.0);
nums.sort(Comparator.comparing(num -> order.get(nums.indexOf(num))));
System.out.println(nums);