How to write Vector object to a text file?

[Andrew Parker]

Hi,
I have the following class:

public class X {
  public String na;
  public String sex;
  public String age;
  public X(String a, String b, String c){
    na = a;
    sex = b;
    age = c;
  }
  public String na(){
    return na;
  }
  public String sex(){
  return sex;
  }
  public String age(){
  return age;
  }
}

I created another class which uses Vector to store the object like that:

Vector v = new Vector();
       while ((x = in.readLine()) != null ) //user input 3 variables from console 
       {
         StringTokenizer y = new StringTokenizer(x, test.txt);
           String n = y.nextToken();
           String s  = y.nextToken();
           String a  = y.nextToken();
           v.add(new X(n, s, a));
         }

How can I write vector object (name, sex and age for all objects) to a text file LINE by LINE?
How can I cast that object's name, sex and age to be String?
Thanks for help.
Andrew

[Eric Fletcher]

I think you mean how do you write what's IN the object to a text file, right?
In this case you don't have to cast them to Strings, they are already Strings. If you mean a single step to return the instance variables as a single String, you could override the toString() method of X to put them all together in one String:
In X...

 
public String toString(){
StringBuffer buf = new StringBuffer();
buf.append("Name: ");
buf.append(this.na);
buf.append(" Sex: ");
buf.append(this.sex);
buf.append(" Age: ");
buf.append(this.age);
buf.append("\n");
return buf.toString();
}

Or something like that depending on your needs.
Then you have a choice of whether you want to build a big String(delimited by newlines) and write it to the file all at once, or write once for each object in the Vector. Check out these links for writers:
BufferedWriter
FileWriter
PrintWriter
HTH,
E