EECS 1021 Lab Test 2 Practice

Main.java

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        final int SAFE_DIST = 5; // declares main variable

        Scanner fileName = new Scanner(System.in); // reads filename
        System.out.print("Please enter the name of the input file: "); // output
        Scanner inFile = new Scanner(new File(fileName.nextLine())); // reads file from filename
        fileName.close(); // close filename scanner

        ArrayList<Float> list = new ArrayList<>(); // create list

        while (inFile.hasNextLine()) {
            String[] inputLine = inFile.nextLine().split(","); // split each line at comma
            Float distance = Float.parseFloat(inputLine[1]); // convert distance to float
            list.add(distance); // add distance to list
        }
        inFile.close(); // close file scanner

        Collections.sort(list); // sort list
        float minDiff = Float.MAX_VALUE; // set init minimum diff

        for (int i = 1; i < list.size(); i++) {
            float diff = list.get(i) - list.get(i - 1); // difference between each two elements
            minDiff = Math.min(minDiff, diff); // find the lesser value of thw two vars
        }

        if (minDiff < SAFE_DIST) {
            System.out.println("They are not in safe orbits.");
        } else {
            System.out.println("They are in safe orbits.");
        }

        System.out.println("Minimum distance is " + minDiff + " km.");

    }
}