Creating an Array of Objects from a Class

Question

public class PostalCodes {
private String city;
private double latitude;
private double longitude;
private String zip;
private String state;

public PostalCodes(String aZip, String aCity, String aState, double aLatitude, double aLongitude)
{
    city = aCity;
    latitude = aLatitude;
    longitude = aLongitude;
    zip = aZip;
    state = aState;
}

void setZip(String aZip)
{
    zip=aZip;
}

void setState(String aState)
{
    state=aState;
}


void setLocation(String aCity)
{
    city = aCity.trim();
}
void setLatitude(double lat)
{
    latitude = lat;
}
void setLongitude(double long1)
{
    longitude = long1;
}
public String getState()
{
    return state;
}
public String getZip()
{
    return zip;
}
public String getLocation()
{
    return city;
}
public double getLatitude()
{
    return latitude;
}
public double getLongitude()
{
return longitude;
}
public String toString()
{
    String result = String.format("%s %s,%s (%1.3f; %1.3f)",zip, city, state, latitude,longitude);
    return result;
}

} Above is my class i'm trying to make an array of 50000 of and below is my main...

public class Hmwk {

public static void main(String[] args) throws IOException {
    URL url = new URL("http://noynaert.net/zipcodes.txt");
    Scanner input=new Scanner (url.openStream());
    int counter =0;
    final int MAX_SIZE=50000;
    PostalCodes[] codesArray= new PostalCodes[50000];
    while (input.hasNextLine() && counter < MAX_SIZE)
    {
        String line=input.nextLine();
        String[] tokens;
        tokens = line.split("\t");
        if (tokens.length != 5)
        {
            continue;
        }
        String zip=tokens[0];
        String city=tokens[1];
        String state=tokens[2];
        double lat=Double.parseDouble(tokens[3]);
        double longy=Double.parseDouble(tokens[4]);
        PostalCodes code=new PostalCodes(zip,city,state,lat,longy);
        codesArray[counter]= code; //Error here
        //System.out.println(code.toString());
        counter++;
    }

                for (int i =0;i<counter; i+=1000)
    {
                  System.out.println(codesArray[i].toString());
    }
}

I'm attempting to save the first 50000 entries as 095601 Amador City,CA (38.427; -120.828),095604 Auburn,CA (39.106; -120.536), 095605 West Sacramento,CA (38.592; -121.528) etc. in my array. I was able to print out the format I want, but I can't figure out how to add it to an array. Thanks for your time.

Bohemian · Accepted Answer · 2014-04-01 23:06:40Z

1

Your code is trying to add a String to an array of PostalCodes, but you actually want to add a PostalCodes object.

Remove the call to toString():

PostalCodes code = new PostalCodes(zip,city,state,lat,longy);
codesArray[counter] = code;

BTW, I recommend renaming your class to the singular PostalCode.

answered Apr 1, 2014 at 23:06

Bohemian♦

427k103 gold badges603 silver badges750 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

user102817 Over a year ago

So how would I go about printing out say the first 3 elements of the array in the 095601 Amador City,CA (38.427; -120.828) format? Would a for loop with System.out.println(codesArray[i.toString()] work? Thanks for the fast reply by the way

user628985 Over a year ago

Yeah, a for loop should be able to do that for you.

user102817 Over a year ago

@Bohemian I tried what you said and then I tried to print out elements of the array and it's not printing anything, just running and terminating?

user102817 Over a year ago

@Welshboy I tried doing that and it didn't print out anything. I edited my original code to display what I currently have. Any ideas where I'm going wrong here?

user102817 Over a year ago

Well i'm trying to print the first element, and then every thousandth element

|

sendon1982 · Accepted Answer · 2014-04-01 23:36:50Z

0

I suggest you use Collection framework Java provided.

List<PostalCodes> postalCodeList = new ArrayList<PostalCodes>(50000);

PostalCodes code = new PostalCodes(zip,city,state,lat,longy);
postalCodeList.add(code);

answered Apr 1, 2014 at 23:36

sendon1982

11.5k72 silver badges49 bronze badges

Collectives™ on Stack Overflow

Creating an Array of Objects from a Class

2 Answers 2

7 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

7 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related