Random words from text file - how to avoid duplicate index numbers?

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Random numbers 1-13 that don't repeat more than once

final IntList sequence = IntList.fromRange(1, 14); println(sequence);//IntList size=13 [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 ] sequence.shuffle(this); println(sequence); exit();

Repeating and randomizing string arrays

The shuffle() function from the 1st link I’ve posted is for arrays of datatype int only: @SafeVarargs final int[] shuffle(final int... arr) { if (arr == null) return null; int idx = arr.length; while (idx > 1) { final int rnd = (int) random(idx--), tmp = arr[idx]; arr[idx] = arr[rnd]; arr[rnd] = tmp; } return arr; } For object-typed arrays, we need to convert it, like this: @SafeVarargs final <T> T[] shuffle(final T... arr) { if (arr == null) return null; …