In this problem we are going to use ArrayLists and classes to design a road trip.

You have three classes: GeoLocation.java from earlier, which represents a geo location. A RoadTrip.java class which represents a road trip (or an ordered list of places), and a RoadTripTester.java class which brings them all together.

In GeoLocation.java:

Add a private instance variable called name which is a String. This represents the name of the location.

Modify the Geolocation class constructor so that it is now of the format

public GeoLocation(String name, double theLatitude, double theLongitude)
Add a getter method for name called getName().

Update the toString so that it returns a String of the format

San Francisco (37.7833, -122.4167)
Now, youâll also need to create a RoadTrip class. The RoadTrip stores an ordered list of locations, so youâll need to have an ArrayList. Youâll also need to support these methods.

// Create a GeoLocation and add it to the road trip
public void addStop(String name, double latitude, double longitude)

// Get the total number of stops in the trip
public int getNumberOfStops()

// Get the total miles of the trip
public double getTripLength()

// Return a formatted toString of the trip
public String toString()
Weâve given you a tester program to help get you started.

The output from that program would be:

1. San Francisco (37.7833, -122.4167)
2. Los Angeles (34.052235, -118.243683)
3. Las Vegas (36.114647, -115.172813)

Stops: 3
Total Miles: 572.9708850442705

The program is an illustration of classes, methods and array lists

Classes are templates used to create methods, while array lists are simply arrays that can be resized

The program written in Java, where comments are used to explain each line is as follows:

import java.util.ArrayList;

public class Main{

   //The main method begins here

   public static void main(String[] args){

       //This creates a RoadTrip object

       RoadTrip rt = new RoadTrip();

       //These initialize the RoadTrip object

       rt.addStop("San Francisco", 37.7833, -122.4167);

       rt.addStop("Los Angeles", 34.052235, -118.243683);

       rt.addStop("Las Vegas", 36.114647, -115.172813);

       //The following iteration prints each object

       for (GeoLocation x: rt.getRoadTrip()) {

           System.out.println(x.toString());

       }

       //This prints a new line

       System.out.println();

       //This prints the number of stops

       System.out.println("Stops: " + rt.getNumberOfStops());

       //This prints the total number of miles

       System.out.println("Total Miles: "+ rt.getTripLength());

  }

}

//This defines the RoadTrip class

class RoadTrip{

   //This creates an ArrayList for the RoadTrip

   public static ArrayList<GeoLocation> roadTrip = new ArrayList<GeoLocation>();

   //This declares and initializes i to 0

   int i = 0;

   // This creates a GeoLocation and add it to the road trip

   public void addStop(String name, double latitude, double longitude){

       GeoLocation location = new GeoLocation(name, latitude, longitude);

       roadTrip.add(location);

       i += 1;

   }

   //This defines an ArrayList method that returns the roadTrip

   public ArrayList<GeoLocation> getRoadTrip() {

       return roadTrip;

   }

   // This defines an int method that returns the total number of stops

   public int getNumberOfStops() {

      return i;

  }

  // The following method returns the total miles of the trip

  public double getTripLength(){

      double numberOfMiles = 0;

      for (int x = 0; x < roadTrip.size()-1; x++) {

          if ((x-1) != roadTrip.size()) {

              numberOfMiles += roadTrip.get(x).distanceFrom(roadTrip.get(x+1));

          }

      }

      return numberOfMiles;

  }

}

//This defines the GeoLocation class

class GeoLocation{

   //The next four lines declare the required variables

   public static final double RADIUS = 3963.1676;

   private String name;

   private double latitude;

   private double longitude;

   //This defines the GeoLocation method

   public GeoLocation(String name, double theLatitude, double theLongitude){

       //The next three lines initialize name, latitude and longitude

       this.name = name;

       latitude = theLatitude;

       longitude = theLongitude;

   }

   //The following string method returns the name of the geo location

   public String getName() {

       return this.name;

  }

  // The following string method returns a string representation of this geo location

  public String toString(){

      return this.name +  " (" + longitude + ", " + latitude + ")";

  }

  // The following double method returns the distance in miles between the geo locations

  public double distanceFrom(GeoLocation other){

      double lat1 = Math.toRadians(latitude);

      double long1 = Math.toRadians(longitude);

      double lat2 = Math.toRadians(other.latitude);

      double long2 = Math.toRadians(other.longitude);

      // This calculates the distance between the two locations and the north pole

      double theCos = Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(long1 - long2);

      double arcLength = Math.acos(theCos);

//This returns the calculated distance

      return arcLength * RADIUS;

  }

}

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