Create CocktailSort.java

CocktailSort.java

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+
+public class CocktailSort 
+{
+	void cocktailSort(int a[])
+	{
+		boolean swapped = true;
+		int start = 0;
+		int end = a.length;
+		while (swapped == true) 
+		{
+			// reset the swapped flag on entering the
+			// loop, because it might be true from a
+			// previous iteration.
+			swapped = false;
+			// loop from bottom to top same as
+			// the bubble sort
+			for (int i = start; i < end - 1; ++i) 
+			{
+				if (a[i] > a[i + 1]) {
+					int temp = a[i];
+					a[i] = a[i + 1];
+					a[i + 1] = temp;
+					swapped = true;
+				}
+			}
+			// if nothing moved, then array is sorted.
+			if (swapped == false)
+				break;
+			// otherwise, reset the swapped flag so that it
+			// can be used in the next stage
+			swapped = false;
+			// move the end point back by one, because
+			// item at the end is in its rightful spot
+			end = end - 1;
+			// from top to bottom, doing the
+			// same comparison as in the previous stage
+			for (int i = end - 1; i >= start; i--) 
+			{
+				if (a[i] > a[i + 1]) 
+				{
+					int temp = a[i];
+					a[i] = a[i + 1];
+					a[i + 1] = temp;
+					swapped = true;
+				}
+			}
+			// increase the starting point, because
+			// the last stage would have moved the next
+			// smallest number to its rightful spot.
+			start = start + 1;
+		}
+	}
+	/* Prints the array */
+	void printArray(int a[])
+	{
+		int n = a.length;
+		for (int i = 0; i < n; i++)
+			System.out.print(a[i] + " ");
+		System.out.println();
+	}
+	// Driver code
+	public static void main(String[] args)
+	{
+		CocktailSort ob = new CocktailSort();
+		int a[] = { 5, 1, 4, 2, 8, 0, 2 };
+		ob.cocktailSort(a);
+		System.out.println("Sorted array");
+		ob.printArray(a);
+	}
+}