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Java Program for Gnome Sort
  • Last Updated : 04 Dec, 2018

Algorithm Steps

  1. If you are at the start of the array then go to the right element (from arr[0] to arr[1]).
  2. If the current array element is larger or equal to the previous array element then go one step right
                   if (arr[i] >= arr[i-1])
                      i++;
  1. If the current array element is smaller than the previous array element then swap these two elements and go one step backwards
                       if (arr[i] < arr[i-1])
                       {
                           swap(arr[i], arr[i-1]);
                           i--;
                       }
  1. Repeat steps 2) and 3) till ‘i’ reaches the end of the array (i.e- ‘n-1’)
  2. If the end of the array is reached then stop and the array is sorted.
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// Java Program to implement Gnome Sort
  
import java.util.Arrays;
public class GFG {
    static void gnomeSort(int arr[], int n)
    {
        int index = 0;
  
        while (index < n) {
            if (index == 0)
                index++;
            if (arr[index] >= arr[index - 1])
                index++;
            else {
                int temp = 0;
                temp = arr[index];
                arr[index] = arr[index - 1];
                arr[index - 1] = temp;
                index--;
            }
        }
        return;
    }
  
    // Driver program to test above functions.
    public static void main(String[] args)
    {
        int arr[] = { 34, 2, 10, -9 };
  
        gnomeSort(arr, arr.length);
  
        System.out.print("Sorted sequence after applying Gnome sort: ");
        System.out.println(Arrays.toString(arr));
    }
}
  
// Code Contributed by Mohit Gupta_OMG

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Output:

Sorted sequence after applying Gnome sort: [-9, 2, 10, 34]

For understanding of Arrays.toString(), Please refer :
https://www.geeksforgeeks.org/arrays-tostring-in-java-with-examples/

Please refer complete article on Gnome Sort for more details!

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