Java Program for Gnome Sort

Last Updated : 04 Dec, 2018

Algorithm Steps

If you are at the start of the array then go to the right element (from arr[0] to arr[1]).
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++;

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--;
                       }

Repeat steps 2) and 3) till ‘i’ reaches the end of the array (i.e- ‘n-1’)
If the end of the array is reached then stop and the array is sorted.

// 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 

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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