BufferedReader help

[RJ Cavender]

My problem is that when i enter data, restart the program option #1 to add member option #2 to modify member, no matter what I do I only get back the first record. PLUS...if i dont enter anything the 2nd time, when I exit again..my member.dat file is erased! Do I need to structure the count differently in start_program?

package ymcaProject;
import java.text.*;
import java.util.*;
import java.io.*;
import javax.swing.JOptionPane;
 

public class ymcaProject {
 

 public static void main(String[] args) {
 
 int count=-1;
 int i;
 double repAnswer;
 double total=0.0;
 
 String []fname = new String[100];
 String []lname = new String[100];
 
 int []memId = new int[100];
 String []gender = new String[100];
 
 int[] age = new int [100];
 double [] Membership_fee = new double [100];
 int[] Silver_sneaker_member = new int [100];
 

 

start_program(fname,lname,memId,gender,age,Membership_fee,Silver_sneaker_member,count);
 
 //Call to the menu method
 
  int menuAnswer=(int)Menu();
 
  while(menuAnswer !=4)
  {
 
  if(menuAnswer==1)
 
    count=Modify_Member(fname,lname,count,memId,gender,age,Membership_fee,Silver_sneaker_member);
  if(menuAnswer==2)
    Modify_Enrollment();
  if(menuAnswer==3)
    Report(fname,lname,gender,memId,count,age,Membership_fee,Silver_sneaker_member,total);
  menuAnswer=(int)Menu();
 
  }
  exit_program(fname,lname,memId,gender,age,Membership_fee,Silver_sneaker_member,count);
  System.exit(0);
 

 

  }//end of main method
 
void start_program(String []fname,String []lname,int []memId,String []gender,
    int[] age, double[] Membership_fee,int[] Silver_sneaker_member,int count) {
String newLine;
     try
     {
 
     BufferedReader Member_file=new BufferedReader (new FileReader("member.dat"));
 

     while((newLine = Member_file.readLine()) !=null)
     {
     StringTokenizer delimiter = new StringTokenizer(newLine,"#");
     count=count+1;
         fname[count]=delimiter.nextToken();
         lname[count]=delimiter.nextToken();
         memId[count]=Integer.parseInt(delimiter.nextToken());
         gender[count]=delimiter.nextToken();
         age[count]=Integer.parseInt(delimiter.nextToken());
         Membership_fee[count]=Double.parseDouble(delimiter.nextToken());
         Silver_sneaker_member[count]=Integer.parseInt(delimiter.nextToken());
 
     }//end while loop
 

     Member_file.close();
 
     }catch (IOException error)
     {
 
     // there was an error on the file writing
     System.out.println("Error on file read " + error);
     }//error end
     }//end of start program member method
 //
 //
 //
 //
  //BEGINNING OF MENU METHOD
     public static double Menu(){
 

     double menuAnswer;
 
     String output = "The Pittsburgh YMCA"+
      "\n" +"1. Add/Modify Member Data";
 
     String menuDataString =JOptionPane.showInputDialog(
      "The Pittsburgh YMCA"+
      "\n"+
      "\n"+"1. Add/Modify Member Data"+
      "\n"+"2. Add/Modify Class Enrollments"+
      "\n"+"3. Report Section"+
      "\n"+"4. Exit the System"+
      "\n"+
      "\n"+"Please Make Your Selection>"+
      "\n");
 

     menuAnswer = Double.parseDouble(menuDataString);
 
    return menuAnswer;
     }//end of menu method
   //
   //
   //
   //
 //beginning of Modify Member
 
     public static int Modify_Member(String[]fname,String[]lname,int count,
      int[] memId,String[]gender,int[]age, double[]Membership_fee,int[]Silver_sneaker_member)
 

     {
     double menuQuestion=0;
      int modMember=0;
 
      String output = "";
 
     String menuDataString =JOptionPane.showInputDialog(
      "What do you wish to do?"+
      "\n"+
      "\n"+"1. Add a member?"+
      "\n"+"2. Modify a member?"+
      "\n"+"3. Delete a member?"+
      "\n"+
      "\n"+"Please Make Your Selection>"+
      "\n");
 

     menuQuestion = Double.parseDouble(menuDataString);
 

     if(menuQuestion==1)
     {
     int continueit=1;
     String svalue;
     String memAge;
     String sneakAns;
     String memberFee;
 

     while(continueit==1)
     {
     count=count+1;
     fname[count]= JOptionPane.showInputDialog(null,
             "Enter First Name"," ",
      JOptionPane.QUESTION_MESSAGE);
 
      output="Enter Last Name";
      lname[count]=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
 
      output="Enter 3 Digit ID";
      svalue=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      memId[count]=Integer.parseInt(svalue);
 
      output="Enter Gender M or F";
      gender[count]=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
 
      output="Enter Age";
      memAge=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      age[count]=Integer.parseInt(memAge);
 
      output="Enter Membership Fee";
      memberFee=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      Membership_fee[count]=Double.parseDouble (memberFee);
 

      output="Silver Sneaker Member? 1=yes 2=no";
      sneakAns=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      Silver_sneaker_member[count]= Integer.parseInt(sneakAns);
 

 
      output="Enter 1 to continue, 0 to stop";
      svalue=JOptionPane.showInputDialog(null,
            output," ",JOptionPane.QUESTION_MESSAGE);
      continueit=Integer.parseInt (svalue);
 

 
      }//while loop
     }//end if
 

     if(menuQuestion==2)
 
     {
     int i=0;
 
       String optionTwoDataString =JOptionPane.showInputDialog(
      "Please enter Member ID");
      modMember=Integer.parseInt(optionTwoDataString);
 
      {
 
      if (modMember==memId[i])
 
      {
 
      System.out.print(fname[i]+" "+lname[i]);
      }//end Modify_member option 2 if statemet
 

     }//end option 2 if from Modify_member method
     }
     return count;
 
     }//end of modify member method
 //
 //
 //
 //
 
   public static void Modify_Enrollment() {
 
   System.out.print("the Modify Enrollment menu has been called");
 
     }//end of modify enrollment method
 
//
//
//
//
//
//
//REPORT METHOD
  public static int Report(String []fname,String []lname,String[]gender,
  int[]memId,int count,int[]age,double[]Membership_fee,int[]Silver_sneaker_member,double total)
  {
    int i;
    double repAnswer=-1;
    String ageAnswer;
    String genderAns;
    String M="";
    int genAns;
    int ageCount;
    while (repAnswer !=10)
    {
 
    double reportMenu;
 
      String repMenuString =JOptionPane.showInputDialog(
      "REPORT MENU"+
      "\n"+
      "\n"+"1. All membership information"+
      "\n"+"2. All Silver Sneaker members"+
      "\n"+"3. All members above a specific age"+
      "\n"+"4. Total membership fees paid"+
      "\n"+"5. All male or female members"+
      "\n"+"6. Report 6"+
      "\n"+"7. Report 7"+
      "\n"+"8. Report 8"+
      "\n"+"9. Report 9"+
      "\n"+"10. Exit Report Menu"+
      "\n"+
      "\n"+
      "\n"+"Please make your selection >");
    repAnswer = Double.parseDouble(repMenuString);
 

    if(repAnswer==1)
    {
 
    for (i=0; i<=count; ++i)
    {
 
  System.out.println(fname[i]+" "+lname[i]+" "+memId[i]+" "+gender[i]+" "+age[i]+" "+
   Membership_fee[i]+" "+Silver_sneaker_member[i]);
 
    }//end for statement option 1
    }//end if option 1
    if(repAnswer==2)
    {
     for (i=0; i<=count; ++i)
     if(Silver_sneaker_member[i]==1)
 
      {
        System.out.println (fname[i]+" "+lname[i]);
      }
 
    }//end if statement option two
 
    if(repAnswer==3)
    {
     String output=" ";
      output="Enter age cutoff";
      ageAnswer=JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      ageCount=Integer.parseInt(ageAnswer);
 

     for (i=0; i<=count; ++i)
     {
 
     if(age[i]>=ageCount)
      System.out.println(fname[i] + " " +lname[i]);
     }
    }//end option 3
 

 
    //begin option 4
    if (repAnswer==4)
    {
     for (i=0; i<=count; ++i)
     {
      System.out.println("First Name"+" " +fname[i]+" "+"Last Name"+
      " "+lname[i]+" "+"Fee"+" "+Membership_fee[i]);
     total += Membership_fee[i];
 
     }//end option 4
     System.out.println( "Membership Fee Total: "+ total);
    }
 
    //begin option 5
    if (repAnswer==5)
    {
      String output;
      output="For Male Members 1 for Female Members 2";
      genderAns= JOptionPane.showInputDialog (null,
             output," ",
      JOptionPane.QUESTION_MESSAGE);
      genAns=Integer.parseInt(genderAns);
     for (i=0; i<=count; ++i)
    {
     if (genAns==1)
     {
      for (i=0; i<=count; ++i)
      if(gender[i].startsWith("M"))
      {
 
      System.out.println (fname[i]+" "+lname[i]);
      }
     }
     if(genAns==2)
     {
      for (i=0; i<=count; ++i)
      if(gender[i].startsWith("F"))
      {
       System.out.println(fname[i]+" "+lname[i]);
      }
     }
    }
    }
    //end option 5
    }//end while
   return count;
 
     }//end of Report method
 

//begin exit program method
   public static void exit_program(String []fname,String []lname,int[]memId,String []gender,
   int[] age, double[]Membership_fee,int[] Silver_sneaker_member,int count)
 
   {
   int i;
  try
    {
  BufferedWriter Member_file = new BufferedWriter(new FileWriter("member.dat"));
  for(i=0; i<=count; ++i)
  {
  System.out.println(fname[i] + "#" + lname[i] + "#"+ memId[i] + "#" + gender[i] + "#" +
  age[i] + "#" + Membership_fee[i] + "#" + Silver_sneaker_member[i]);
 
  Member_file.write(fname[i] + "#" + lname[i] + "#"+
      memId[i] + "#" + gender[i] + "#" + age[i] + "#" + Membership_fee[i] + "#" +
      Silver_sneaker_member[i]);
  Member_file.newLine();
  }//end for loop
 

  Member_file.close();
  }//end of try
  catch (IOException error)
  {
  System.out.println("Error on file write "+ error);
  }//end error
 
   }//end of exit method
 

}//end of public class ymcaProject
 

[RJ Cavender]

If someone could just help me figure out this one section i think id be okay. I still have the problem of the member.dat file erasing itself when i hit exit, but while its created (ive seen it) if I have 4 names in it, i should be able to enter Member_id (when prompted)and that name come up. Only "one" does....just one. And the logic to me seems sound,...create an answer variable (modMember) and compare that to memId. If i hit Modify Member and it asks for a member id,....i should be able to do that again and again with different id's. Any help would be appreciated. Only one comes up and its ignoring all others.

  String optionTwoDataString =JOptionPane.showInputDialog(
      "Please enter Member ID");
      modMember=Integer.parseInt(optionTwoDataString);
      if (modMember==memId[i])
      {
        System.out.print(fname[i]+" "+lname[i]);
      }//end Modify_member option 2 if statemet
 

     }//end option 2 if from Modify_member method
 

 

[Keith Lynn]

I'm not sure exactly what you are trying to do. I assume that each member has a unique id? Then what you're describing seems like you want to keep looping asking for a member id until the user hits a value that indicates they are finished.

[RJ Cavender]

There is a series of menus. The first on (in the Menu method) comes up and right now im only dealing with option #1, add/modify member. When that is called, a second menu comes up asking if you want to (1)add (2)modify (3)delete a member.

In the Modify_member, a list of names (last name, first name, member id..gender..etc) is created and in the exit method, written to member.dat.

When the program is run again, and i get to "modify member", option 2 under the second menu again, I want to be able to access any one of those names by their member id. I "can" access one,...only one. It for some reason ignores all the others.

I can do a search of my pc and find the member.dat file and see that it does create the list, but running it again only allows me to access one name. That is my problem.

[Keith Lynn]

Take a look at this line.

BufferedWriter Member_file = new BufferedWriter(new FileWriter("member.dat"));

If you look at the API, you'll see that the behavior you're describing about the file being deleted is exactly what that constructor of FileWriter does.

[RJ Cavender]

Yes, it writes to that file. WHich it does, ive seen it. When i read that file in again, and go to select by ID, i can only read one name. Im not (at that point) writing again. If they are there, the way i have the selection set up, it keeps going back to the menu asking you if you want to (1)add or (2) modify and modify asks you to specify a member id. That list is still there (theoretically) why does it only acknoledge one?

[Keith Lynn]

Shouldn't it only acknowledge the one with the member id that you search for?

[RJ Cavender]

Sure, but then when it goes back to the (1)add (2) modify menu, i want to be able to search for another member.

[pete stein]

Do you want to append to "member.dat" or overwrite it? I think append is done like so:

BufferedWriter Member_file = new BufferedWriter(new FileWriter("member.dat"), true);

[RJ Cavender]

Thanks, it SHOULD work,..i have an example from class,..the exit is coded just like that.

[RJ Cavender]

Somehow, through messing with the code, I lost what I had. It WAS printing names (God only knows how) now I get nothing but nulls. I guess im confused as to how i should (or should not) be passing count to this last method. All its supposed to do, is take the info gained in the menus i have going, and write it all to a file. No matter how i tinker with it, im getting

null#null#0#null#0#[D@197a37c#0

Any advice on what I could try? Here is the complete exit_program method.

//begin exit program method
   public static void exit_program(String []fname,String []lname,int[]memId,String []gender,
   int[] age, double[]Membership_fee,int[] Silver_sneaker_member,int count) 
    
    {
    int i;
   try
     {
      
    BufferedWriter Member_file = new BufferedWriter(new FileWriter("member.dat"));
    for(i=0; i<=count; ++i)
    {
   
    {
     System.out.println(fname[i] + "#" + lname[i] + "#"+ memId[i] + "#" + gender[i] + "#" +
    age[i] + "#" + Membership_fee[i] + "#" + Silver_sneaker_member[i]); 
 
     Member_file.write(fname[i] + "#" + lname[i] + "#"+
        memId[i] + "#" + gender[i] + "#" + age[i] + "#" + Membership_fee[i] + "#" + 
        Silver_sneaker_member[i]);
     Member_file.newLine();
    }
    }//end for loop
 

    Member_file.close();
   }//end of try
   catch (IOException error)
   {
    System.out.println("Error on file write "+ error);
   }//end error 
 
   }//end of exit method

[pete stein]

is it outputting to string ok? How about your variable count, is that correct?

[pete stein]

I tried to distill this to a simpler program, and it works for me. I recommend that you do the same. Make a copy of your program and then distill it down to a skeleton prog that reproduces your error. One thing you have to be very careful with is the count variable. You are not getting it from Array.length so there is great risk of a mistake here. Also, I see that your for loop goes to i <= count, again a risk.

// begin exit program method
public static void exit_program(String[] fname)
 
{
try
{
BufferedWriter Member_file = new BufferedWriter(new FileWriter("member.dat"));
for (int i = 0; i < fname.length; ++i)
 
{
System.out.println(fname[i]);
 
Member_file.write(fname[i]);
Member_file.newLine();
 
}// end for loop
 
Member_file.close();
}// end of try
catch (IOException error)
{
System.out.println("Error on file write " + error);
}// end error
 
}// end of exit method
 
public static void main(String[] args)
{
String[] myStrAr = 
{
"hi", "bye", "omg", "yabetcha!", "what the hey!"
};
exit_program(myStrAr);
}
}

My guess is that if the problem isn't with the count variable it has to do with the arrays that you are passing to the exit procedure. How are you passing them? Can you do a System.out.println() check on one of the array variables at the time that you pass it to the exit routine (using a for loop to check each item in the array of course)?
[ April 08, 2007: Message edited by: pete stein ]

[RJ Cavender]

I have a system.out.println for every variable (one whole line) in Exit_program. Everything is kosher "except" for Member_id, the only double. So hitting exit causes everything to print........for some reason if i do a search on the member.dat file and open it up in Notepad, i get nulls......Ive been debugging almost all day (nice Easter, eh) with no luck.

[pete stein]

How big is your code?

[RJ Cavender]

Well,..thats kinda personal aint it? HAHA!! couple hundred lines,..but in manageable methods.