Java IO problem

[hugo84]

Hi i need help.. Im actually trying to read a file line by line from the input text file and then write word by word into the output text file. In case a word is found to match exactly an abbreviation name in the database object, this method will additionally output the full names. The max_linewidth arguement has to be at least 30, and translafeFile has to ensure that the number of characters including space in every line in the output text file does not exceed max_linewidth. Below is my code so far.. i have not been able to sovle the max_linewidth problem to print out properly.

txt file

The MOE has given out a total of 420 teaching scholarships and 
awards, the highest number of scholarships and awards given out 
since 2003.

MOE said that it has a bumper harvest this year because of the 
strong interest in teaching among quality candidates.

Four candidates have been awarded the prestigious Overseas Merit 
Scholarships for Teaching by the Public Service Commission, 
while 17 others have been given the coveted Education Merit 
Scholarship.

   import java.io.*;
   import java.util.StringTokenizer;
    public class Translate{
      private Data db;
   
       public Translate(Database database){
         this.database=database;
      }
       public int translateF(String ifilename,String filename,int max_lwidth){
         int numAbbr=0;
      
         try{
            BufferedReader br =new BufferedReader(new FileReader(input_filename+".txt"));
            PrintWriter pw	=new PrintWriter(new BufferedWriter(new FileWriter(output_filename+".txt")));
            String returnStr=processToken(br.readLine());
         
            if(returnStr.length()-1<max_linewidth)
               pw.write(returnStr.substring(0,returnStr.length()-1));
         //test
            System.out.println("check:"+returnStr.substring(returnStr.length()-1));
         //writer.write();
            br.close();
            pw.close();
         }
             catch(FileNotFoundException e){
               System.out.println("TOError: File not found! -"+input_filename);
               System.exit(0);
            }
             catch(IOException e){
               System.out.println(e.getMessage());	
            }
         return -1;
      }
   
       public String processToken(String file){
         StringTokenizer st=new StringTokenizer(file);
         int count=0;
         String str;//store token
         String line="";
         while(st.hasMoreTokens()){
            str=st.nextToken();
            line+= str+" ";
         
         //loop for the total number of abbreviations
            for(int i=0;i<database.getNumAbbreviations();i++){
            //loop for total number of fullname in a abbreviation
               for(int y=0;y<database.getAbbreviationByIndex(i).getNumFullNames();y++){
                  System.out.println(database.getAbbreviationByIndex(i).getAbbrName().trim());
                  if(database.getAbbreviationByIndex(i).getAbbrName().trim().equalsIgnoreCase(str.trim())){
                     line+= "("+database.getAbbreviationByIndex(i).getFullName(y)+") ";
                     count++;
                  
                  }	
               						
               }//end for	
            }//end for
         }//end while
         System.out.println(line);
         if(count!=0){
            return line+count;
         }
         else
            return null;
      }
   }