Merge Sort Hack 2

Option 1 - Adapt mergesort to other object

class Cookie {
    private String name;
    private int calories;

    public Cookie(String name, int calories) {
        this.name = name;
        this.calories = calories;
    }

    public String getName() {
        return name;
    }

    public int getCalories() {
        return calories;
    }

    public String toString() {
        return name + " - Calories: " + calories;
    }
}

class CookieSort {
    // Sorts in ascending order of calories
    void merge(Cookie arr[], int l, int m, int r)
    {
        // Find the sizes of two subarrays to be merged
        int n1 = m - l + 1;
        int n2 = r - m;

        /* Create temp arrays */
        Cookie[] L = new Cookie[n1];
        Cookie[] R = new Cookie[n2];

        /* Copy data to temp arrays */
        for (int i = 0; i < n1; ++i)
            L[i] = arr[l + i];
        for (int j = 0; j < n2; ++j)
            R[j] = arr[m + 1 + j];

        /* Merge the temp arrays */

        // Initial indexes of first and second subarrays
        int i = 0, j = 0;

        // Initial index of merged subarray array
        int k = l;
        while (i < n1 && j < n2) {
            // Uses the getCalories() method call to the Cookie Class
            if (L[i].getCalories() <= R[j].getCalories()) {
                arr[k] = L[i];
                i++;
            } else {
                arr[k] = R[j];
                j++;
            }
            k++;
        }

        /* Copy remaining elements of L[] if any */
        while (i < n1) {
            arr[k] = L[i];
            i++;
            k++;
        }

        /* Copy remaining elements of R[] if any */
        while (j < n2) {
            arr[k] = R[j];
            j++;
            k++;
        }
    }

    // Main function that sorts arr[l..r] using
    // merge()
    void sort(Cookie arr[], int l, int r)
    {
        if (l < r) {
            int m = l + (r - l) / 2;

            sort(arr, l, m);
            sort(arr, m + 1, r);

            merge(arr, l, m, r);
        }
    }

    /* A utility function to print array of size n */
    static void printArray(Cookie arr[])
    {
        int n = arr.length;
        for (int i = 0; i < n; ++i)
            System.out.println(arr[i]);
        System.out.println();
    }

    // Tester method
    public static void main(String args[])
    {
        // Initializes an array of Cookie objects 
        Cookie[] arr = {
            new Cookie("Chocolate Chip", 150),
            new Cookie("Oatmeal Raisin", 120),
            new Cookie("Sugar Cookie", 90),
            new Cookie("Peanut Butter", 200),
        };

        System.out.println("Given Array");
        printArray(arr);

        CookieSort ob = new CookieSort();
        ob.sort(arr, 0, arr.length - 1);

        System.out.println();
        System.out.println("Sorted array");
        printArray(arr);
    }
}
CookieSort.main(null);

Given Array
Chocolate Chip - Calories: 150
Oatmeal Raisin - Calories: 120
Sugar Cookie - Calories: 90
Peanut Butter - Calories: 200


Sorted array
Sugar Cookie - Calories: 90
Oatmeal Raisin - Calories: 120
Chocolate Chip - Calories: 150
Peanut Butter - Calories: 200