C-Family Programming Assignment: Map of a State

You are creating a map of a state. There are several communities that are joined by roads of varying lengths. You need to develop a program that will print out the shortest distance between all the different communities

1. The program shall graphically prompt the user for a file.
2. The program shall read the selected file of which the first line will be a “-” separated list of the communities.
3. The program shall then read each line in the rest of the file containing an integer (the length of the road) and the 2 communities it connects separated by “-”.
4. The program shall calculate the shortest distance between each pair of communities
5. The program shall have output to a file the pairs and the shortest distance between them
6. The program shall write the output to a file in the same directory as the input file.
7. comment is part of this program requirement.

Additional Elements - Error handling, unit tests, input checking if needed.

Were good design principles should be in the construction of the program.

This is just a sample input file the program should have more inputs.

Anoka-St. Paul-Minneapolis-Big Lake
30-Minneapolis-Anoka
20-Minneapolis-St. Paul
40-Big Lake-Minneapolis
30-St. Paul-Anoka

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import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
*
* @author
*/
public class MyMap {

    private ArrayList<MyNode> mns;
    private int[][] d;

    public MyMap(File file) {
       mns = new ArrayList<>();
       readFile(file);
    }

    /**
    * *
    * 5. The program shall have output to a file the pairs and the shortest
    * distance between them
    *
    * @return
    */
    public String getResult() {
       String result = "";
       floy();
       ArrayList<String> al = new ArrayList<>();
       for (int i = 0; i < d.length; i++) {
            int[] is = d[i];
            for (int j = 0; j < i; j++) {
                int k = is[j];
                String str = mns.get(i).getName()
                        + "-" + mns.get(j).getName() + "-" + k;
                al.add(str);
            }
       }
       Collections.sort(al);
       for (String string : al) {
            result += string + System.lineSeparator();
       }
      
       return result;
    }

    /**
    * 4. The program shall calculate the shortest distance between each pair of
    * communities
    * using Floy Algorithm
    */
    private void floy() {
       if (mns.isEmpty()) {
            return;
       }

       d = new int[mns.size()][mns.size()];
       /*
       for (MyNode mn : mns) {
            System.out.println(mn.getName());
       }      
         */
       for (int i = 0; i < d.length; i++) {
            int[] is = d[i];
            for (int j = 0; j < is.length; j++) {
                is[j] = getDistance(i, j);               
            }
       }
       int n = d.length;
       for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                for (int k = 0; k < n; k++) {
                   if (d[j][i] + d[i][k] < d[j][k]) {
                        d[j][k] = d[j][i] + d[i][k];
                   }
                }
            }
       }
    }

    /**
    * get distance between 2 nodes
    * @param i
    * @param j
    * @return
    */
    private int getDistance(int i, int j) {
       MyNode n = mns.get(i);
       MyNode m = mns.get(j);
       return n.distanceTo(m);
    }...