java - Arrays are null. Not getting information from while loop -

the following snippet of code supposed read text file, check how many words in file, , how many lines there are, , information it's supports sort nth word it's appropriate array.

 protected static void loadaccountinformationfromfile() throws exception      {         // these variables control logic needed put words in right array         int accountnumbercount = 1;         int firstnamecount = 2;         int lastnamecount = 3;         int balancecount = 4;         int lastvariablecount = 5;         int sortcount = 1;           scanner account = new scanner(new file(input_account_file)).usedelimiter(",");          // using word count nth value later         int wordcount = 0;         while(account.hasnext())         {             account.next();             wordcount++;         }          // if count 0 means account list empty         if (wordcount == 0)         {             system.err.println("error: account list empty.");              system.exit(1);         }          // used test word count feature: //       system.out.println("number of words: " + wordcount);          int linecount = wordcount / max_values_per_line;          // these arrays used put account information in correct place         // using linecount create array of large needs         string[] accountnumber = new string[linecount - 1];         string[] firstname = new string[linecount - 1];         string[] lastname = new string[linecount - 1];         string[] balance = new string[linecount - 1];         string[] lastvariable = new string[linecount - 1];           // if don't close , open new scanner compiler error                account.close();                         scanner account2 = new scanner(new file(input_account_file)).usedelimiter(",");                      {                  string[] temp1 = account2.next().split(",");                 string temp2 = "" + temp1;                  if (sortcount == accountnumbercount)                 {                     accountnumber[sortcount] = temp2;                 }                 if (sortcount == firstnamecount)                 {                     firstname[sortcount] = temp2;                 }                 if (sortcount == lastnamecount)                 {                     lastname[sortcount] = temp2;                 }                 if (sortcount == balancecount)                 {                     balance[sortcount] = temp2;                 }                 if (sortcount == lastvariablecount)                 {                     lastvariable[sortcount] = temp2;                 }                  accountnumbercount += 5;                 firstnamecount += 5;                 lastnamecount += 5;                 balancecount += 5;                 lastvariablecount += 5;                  sortcount++;                  {                  }              }         while (account2.hasnext());           // testing see if works, returns:         // [null, [ljava.lang.string;@55f96302, null, null, null]         system.out.println(arrays.tostring(accountnumber));          // 1 returns [ljava.lang.string;@55f96302         system.out.println(accountnumber[1]);          account2.close();  } 

it has no problem opening file , counting words properly. however, when came time put words appropriate array doesn't work, indicated in commenting out text.

my question is: why? , how can work without using bufferedwriter / bufferedreader?

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based on answer, corrected flaw in logic end

run: error: 6 java result: 1 build successful (total time: 0 seconds)

here's modified code:

 public class main   { private final static int account_number_index = 0; private final static int first_index = 1; private final static int last_index = 2; private final static int balance_index = 3; private final static int free_checks_index = 4; private final static int interest_index = 4; private final static int max_values_per_line = 5; private final static string input_account_file = "accountinfo.txt"; protected static string[] fields;   protected static void loadaccountinformationfromfile() throws exception      {         // these variables control logic needed put words in right array         int accountnumbercount = 0;         int firstnamecount = 1;         int lastnamecount = 2;         int balancecount = 3;         int lastvariablecount = 4;         int sortcount = 1;           scanner account = new scanner(new file(input_account_file)).usedelimiter(",");          // using word count nth value later         int wordcount = 0;         while(account.hasnext())         {             account.next();             wordcount++;         }          // if count 0 means account list empty         if (wordcount == 0)         {             system.err.println("error: account list empty.");              system.exit(1);         }          // used test word count feature:  //                system.out.println("number of words: " + wordcount);          int linecount = wordcount / max_values_per_line;          // these arrays used put account information in correct place         // using linecount create array of large needs         string[] accountnumber = new string[linecount];         string[] firstname = new string[linecount];         string[] lastname = new string[linecount];         string[] balance = new string[linecount];         string[] lastvariable = new string[linecount];           // if don't close , open new scanner compiler error                account.close();                         scanner account2 = new scanner(new file(input_account_file)).usedelimiter(",");                      {                  string[] temp1 = account2.next().split(",");                 string temp2 = "" + temp1;                  if (sortcount == accountnumbercount)                 {                     accountnumber[sortcount] = temp2;                     accountnumbercount += max_values_per_line;                 }                 if (sortcount == firstnamecount)                 {                     firstname[sortcount] = temp2;                     firstnamecount += max_values_per_line;                 }                 if (sortcount == lastnamecount)                 {                     lastname[sortcount] = temp2;                     lastnamecount += max_values_per_line;                 }                 if (sortcount == balancecount)                 {                     balance[sortcount] = temp2;                     balancecount += max_values_per_line;                 }                 if (sortcount == lastvariablecount)                 {                     lastvariable[sortcount] = temp2;                     lastvariablecount += max_values_per_line;                 }                  sortcount++;              }         while (account2.hasnext());           // testing see if works, returns:         // [null, [ljava.lang.string;@55f96302, null, null, null]         system.out.println(arrays.tostring(accountnumber));          // 1 returns [ljava.lang.string;@55f96302         system.out.println(accountnumber[1]);          account2.close(); 

this happens because on every iteration of loop, increase count variables.

when coming loop first time have following variables:

accountnumbercount == 1 firstnamecount == 2 lastnamecount == 3 balancecount == 4 lastvariablecount == 5 sortcount == 1 

so sortcount == accountnumbercount , means put word accountnumber array second position (index starts 0 on arrays).

then increase above variables , go round two, having following situation:

accountnumbercount == 6 firstnamecount == 7 lastnamecount == 8 balancecount == 9 lastvariablecount == 10 sortcount == 2 

thus on second iteration sortcount no longer equals of other variables. same thing happens on further iterations , end 1 word inserted 1 of 5 arrays.

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if want make work, i'd suggest using arraylists (so don't have worry array indexes or array sizes) instead of arrays , change 1 variable per each iteration.

private static final int account_number_count = 1; private static final int first_name_count = 2; private static final int last_name_count = 3; private static final int balance_count = 4; private static final int last_variable_count = 5;      list<string> accountnumbers = new arraylist<string>(); list<string> firstnames = new arraylist<string>(); list<string> lastnames = new arraylist<string>(); list<string> balances = new arraylist<string>(); list<string> lastvariables = new arraylist<string>();  int sortcount = 1;  // other things...  {     if (sortcount == account_number_count) {         accountnumbers.add(temp2);     } else if (sortcount == first_name_count) {         firstnames.add(temp2);     } else if (sortcount == last_name_count) {         lastnames.add(temp2);     } else if (sortcount == balance_count) {         balances.add(temp2);     } else if (sortcount == last_variable_count) {         lastvariables.add(temp2);     }      if (sortcount < 5) {         sortcount++;     } else {         sortcount = 1;     } } while (account2.hasnext());