Putting Tokens into an Array

[Anica Jovanova]

Please somebody help us with our project. We have 4 tokens of different data types and we are trying to put them into an array. How do we do that? There is a Person object with 4 parametars all different types: long, String, and int. We tokenized them and we are trying to put them into an array of this Person object. How do we do that?
Thanks a lot. Your help is really appreciated.

[Michael Morris]

Hi Anica,
Welcome to JavaRanch. If I understand right, you want to put an int, a long and a String in the same array, is that right? Well, you can't do that. What you can do is wrap the two primitives in Object wrappers and declare an Object[] array to store them like this:

    String myString = "someText";
    int myInt = 9;
    long myLong = 23L;
    Object[] hybrid = new Object[3];
    hybrid[0] = myString;
    hybrid[1] = new Integer(myInt);
    hybrid[2] = new Long(myLong);

Michael Morris

[Anica Jovanova]

Thanks a lot for the quick respond. OK, you have inseted the elements into the array manually, but we are reading them from a file using that bufferedReader thing. And once we do the StringTokenizer() method, to split te four types of data we have, we don't know how to insert them into an array of objects.
here is what we've done so far:
import java.io.*;
import java.util.*;
public class SimpleStringToken {
public static void main(String[] args) throws IOException {
File inputFile = new File(args [0]);
FileReader in = new FileReader(inputFile);
BufferedReader d = new BufferedReader(in);
String line;
while ((line = d.readLine()) != null) {
System.out.println(line);
StringTokenizer st = new StringTokenizer(line);
long id = Long.parseLong(st.nextToken());
String last = (st.nextToken());
String first = (st.nextToken());
int age = Integer.parseInt(st.nextToken());
System.out.println("id = " + id
+ " last name = " + last
+ " first name = " + first
+ " age = " + age);
}
in.close();
}
}
And we have also created a Person object having a constructor like this:
Person(long id, String last, String first, int age)
Does the question make sense now?
Thanks a lot, I'm really happy to have found this site today.

[Wirianto Djunaidi]

I don't really know exactly what you need, but I'm just guessing you want an array of Person with attributes that are read from a file.
From your code I'll say it's easier to use ArrayList.
So you'll have:

...
Collection persons = new ArrayList();
...
while (...)
{
    ...
    /* instead of  System.out.println("id = " + id
+ " last name = " + last
+ " first name = " + first
+ " age = " + age);
    */
    persons.add( new Person(id, last, first, age) );
}
...

Hope that's what you need.
-Ryo