Java-Sort-Algorithms/ShellSort.java at master · mattryanmtl/Java-Sort-Algorithms · GitHub

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import java.util.Random;


public class Shell_Sort

{

    public static int N = 20;

    public static int[] sequence = new int[N];


    public static void shellSort()

    {

        int increment = sequence.length / 2;

        while (increment > 0)

        {

            for (int i = increment; i < sequence.length; i++)

            {

                int j = i;

                int temp = sequence[i];

                while (j >= increment && sequence[j - increment] > temp)

                {

                    sequence[j] = sequence[j - increment];

                    j = j - increment;

                }

                sequence[j] = temp;

            }

            if (increment == 2)

                increment = 1;

            else

                increment *= (5.0 / 11);


        }

    }


    static void printSequence(int[] sorted_sequence)

    {

        for (int i = 0; i < sorted_sequence.length; i++)

            System.out.print(sorted_sequence[i] + " ");

    }


    public static void main(String args[])

    {

        System.out

                .println("Sorting of randomly generated numbers using SHELL SORT");

        Random random = new Random();


        for (int i = 0; i < N; i++)

            sequence[i] = Math.abs(random.nextInt(100));


        System.out.println("\nOriginal Sequence: ");

        printSequence(sequence);


        System.out.println("\nSorted Sequence: ");

        shellSort();

        printSequence(sequence);

    }

}