Merge Sort in Java

Here is the implementation of Merge Sort using Java as my programming language. Our program will ask the user how many items to be sorted and then it will ask the user to give a series of numbers and then it will be sorted using selection sort algorithm. I hope you will find my work useful. 

I am currently accepting programming work kindly contact me in the following email address for further details. Thank you.

My email address are the following jakerpomperada@gmail.com and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

Sample Program Output

Program Listing

/**

 * 

 */

package merge_sort;

import java.util.Scanner;

/**

 * @author Jake R. Pomperada

 * Bacolod City, Negros Occidental, Philippines

 * September 13, 2017   Wednesday

*/

public class Merge_Sorting {

/**

* @param args

*/

public static void merge_sort(int[] arr, int low, int high) 

    {

        int N = high - low;         

        if (N <= 1) 

            return; 

        int mid = low + N/2; 

        

        merge_sort(arr, low, mid); 

        merge_sort(arr, mid, high); 

        

        int[] temp = new int[N];

        int i = low, j = mid;

        for (int k = 0; k < N; k++) 

        {

            if (i == mid)  

                temp[k] = arr[j++];

            else if (j == high) 

                temp[k] = arr[i++];

            else if (arr[j]<arr[i]) 

                temp[k] = arr[j++];

            else 

                temp[k] = arr[i++];

        }    

        for (int k = 0; k < N; k++) 

            arr[low + k] = temp[k];         

    }

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner input = new Scanner(System.in);

     

System.out.print("\n\n");

System.out.print("===== Merge Sort in Java ====");

System.out.print("\n\n");

System.out.print("===== Written By: Mr. Jake R. Pomperada =====");;

System.out.print("\n\n");

System.out.print("How many items? : ");

        int num = input.nextInt();

        int numbers[] = new int[num];

System.out.println();

        for (int i = 0; i < num; i++) {

            System.out.print ("Give value in item no. " + (i+1) + " : ");

            numbers[i] = input.nextInt();

        }

        System.out.print("\n\n");

System.out.print("Original Number Arrangements" );

System.out.print("\n\n");

        for (int temp : numbers){

        System.out.print(temp);

            System.out.print(", ");

        } 

        System.out.print("\n\n");

System.out.print("Sorted Number Arrangements" );

System.out.print("\n\n");

        

        

        merge_sort(numbers,0,num);

        for(int a:numbers){

            System.out.print(a);

            System.out.print(", ");

}

        input.close();

}

}