Shuffle array in Java

Details

The Java SDK gave us Collections.shuffle but not Arrays.shuffle. Here is a way of shuffling an array based on the algorithm of the former. The code is HERE

 

public class ArrayShuffle {

        public static void main(String[] args) {
                // Create an array of int 1 - 7
                Integer[] ints = { 1, 2, 3, 4, 5, 6, 7 };
                // Shuffle it
                ArrayShuffle.shuffle(ints);
                // Print the result
                System.out.println(java.util.Arrays.toString(ints));
        }

        /**
         * Shuffle an array of type T
         *
         * @param <T> The type contained in the array
         * @param array The array to be shuffled
         */
        public static <T> void shuffle(T[] array) {
                for (int i = array.length; i > 1; i--) {
                        T temp = array[i - 1];
                        int randIx = (int) (Math.random() * i);
                        array[i - 1] = array[randIx];
                        array[randIx] = temp;
                }
        }
}
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