Help!!!asap..about multiple files...

I already have a working class for this part.All I need is the application part that will create a property object for each data line read from the the input file assign4.dat. This application should also print each object to a data file, according to its category. If category 1, properties should be printed out to out1.dat, category2 to out2.dat, category 3 to out3.dat, and the rest to outRest.dat..Please help me start off my program.. I am a new programmer trying to learn new things..I would appreciate all your help..here is my working class, that works perfectly fine..and also the assign4.dat, for ur better understanding..Tnx..
import java.util.StringTokenizer;
import java.io.*;
public class Property{
private int category;
private double sellingPrice;
private double commissionRate;
private double commission;
public void Property(String s){
StringTokenizer tokenizer=new StringTokenizer(s);
category=Integer.parseInt(tokenizer.nextToken());
sellingPrice=Double.parseDouble(tokenizer.nextToken());
public void Property(int cat, double selP){
cat=category;
selP=sellingPrice;
public void setCommissionRate(){
if(category==1)
commissionRate=0.04;
if(category==2)
commissionRate=0.06;
if(category==3)
commissionRate=0.071;
public void setCommissionRate(int i){
if((i>=1)&&(i<=3))
category=i;
this.setCommissionRate(i);
else
commissionRate=i;
public double getCommission(){
commission=sellingPrice+commissionRate;
return commission;
public double getCategory(){
return category;
public String toString(){
return "Price: "+sellingPrice+ " Category: "+category+ " Commission Rate: "+ commissionRate + " Commission: "+ commission;
}//end of property
//start of assign4.dat
1 457000
3 14550
2 49000
1 189000
2 24340
3 156700
3 78900
1 39000
1 345500
1 789000
2 550000
1 23500
4 78000
1 45000
5 899999

look at this
[url http://forum.java.sun.com/thread.jspa?threadID=686112]multiple post

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i apologize again.thx anyway . heres the code
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import java.awt.event.*;
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