Shell Sort in Java

Author: Deepali-Srivastava

sorting/ShellSort.java

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+/*
+Copyright (C) Deepali Srivastava - All Rights Reserved
+This code is part of DSA course available on CourseGalaxy.com    
+*/
+
+import java.util.Scanner;
+
+public class ShellSort 
+{
+	private ShellSort(){} //this class is not for instantiation
+		
+	public static void sort(int[] a, int n) 
+	{
+		int i,j,temp,h;
+		
+		Scanner scan = new Scanner(System.in);	
+		System.out.print("Enter maximum increment(odd value) : ");
+		h=scan.nextInt();
+		
+		while(h>=1)
+		{
+			for(i=h; i<n; i++)
+			{
+				temp=a[i];
+				for(j=i-h; j>=0 && a[j]>temp; j=j-h)
+					a[j+h]=a[j];
+				a[j+h]=temp;
+			}
+			h=h-2; 
+		}
+		scan.close();
+	}
+	
+	public static void main(String[] args)
+	{
+		int i,n;
+		int[] a = new int[20];
+		Scanner scan = new Scanner(System.in);	
+		
+		System.out.print("Enter the number of elements : ");
+		n = scan.nextInt();
+	
+		for(i=0; i<n; i++)
+		{
+			System.out.print("Enter element " + (i+1) + " : ");
+			a[i] = scan.nextInt();
+		}
+		
+		sort(a,n);
+		
+		System.out.println("Sorted array is : ");
+		for(i=0; i<n; i++)
+			System.out.print(a[i] + " ");
+		System.out.println();
+		scan.close();
+	}
+}