Create QuickSort.java

Java/QuickSort.java

@@ -0,0 +1,66 @@
+// Java program for implementation of QuickSort
+class QuickSort
+{
+    int partition(int arr[], int low, int high)
+    {
+        int pivot = arr[high]; 
+        int i = (low-1); // index of smaller element
+        for (int j=low; j<high; j++)
+        {
+
+            if (arr[j] <= pivot)
+            {
+                i++;
+
+                // swap arr[i] and arr[j]
+                int temp = arr[i];
+                arr[i] = arr[j];
+                arr[j] = temp;
+            }
+        }
+
+
+        int temp = arr[i+1];
+        arr[i+1] = arr[high];
+        arr[high] = temp;
+
+        return i+1;
+    }
+
+
+
+    void sort(int arr[], int low, int high)
+    {
+        if (low < high)
+        {
+
+            int pi = partition(arr, low, high);
+
+
+            sort(arr, low, pi-1);
+            sort(arr, pi+1, high);
+        }
+    }
+
+    /* A utility function to print array of size n */
+    static void printArray(int arr[])
+    {
+        int n = arr.length;
+        for (int i=0; i<n; ++i)
+            System.out.print(arr[i]+" ");
+        System.out.println();
+    }
+
+    // Driver program
+    public static void main(String args[])
+    {
+        int arr[] = {10, 7, 8, 9, 1, 5};
+        int n = arr.length;
+
+        QuickSort ob = new QuickSort();
+        ob.sort(arr, 0, n-1);
+
+        System.out.println("sorted array");
+        printArray(arr);
+    }
+}