How to make an array in text file (help..)
 

hello guyzz,,,i am almost finished with my code,,but our teacher require us to access a text file..this is it:

in my text file:

accountList.txt

12345 1234 200000 Jerry Lopez



first column was accountNumber, then the pinNumber, then the balance and the name..

what i did was...

import java.io.*;
public class BankAccount{

public void account(){

File ACCOUNT = new File ("accountList.txt");
FileReader fr = new FileReader(FROZEN);
Reader reader1 = new BufferedReader (fr);
LineNumberReader lnr = new LineNumberReader (reader1);
String line;
for (line = lnr.readLine(); line!=null; line = lnr.readLine()){

String account[] = new String[4];
int count = 0;


int accountNumber[] = Integer.parseInt(account[count][1]);
int pinNumber[] = Integer.parseInt(account[count][2];
int balance[] = Integer.parseInt(account[count][3];
String name = account[count][4];


System.out.println(accountNumber[0][1]);
}
}


i want to sysout the accountNumber,,which is
12345

it has no error when i run it,,but i dont really know what is the problem...

it only print out
0

and i dont know why zero,,,,it seems there is a problem when i declare it...

help guyzzz...i really need your help because we are about to pass it next week,,,,

"that is a shortcut,,i already have the main method.."

Re: How to make an array in text file (help..)
 

int accountNumber[] = Integer.parseInt(account[count][1]);
int pinNumber[] = Integer.parseInt(account[count][2];
int balance[] = Integer.parseInt(account[count][3];
String name = account[count][4];

i dont know wat exactly r u doing here
u created account[] is a String Single Dimension array and we are accessing it as a double dimension array


-------------------------My View---
now u got the line from the File ri8
suppose say
12345 1234 200000 Jerry Lopez
step1 : split the line with space as delimiter
and write each in a String array ,
say names(array name) names[0]=jerryu Lopez
names[1]=200000
names[2]=1234
names[3]=12345
step2: Now Create an HashMap map =new HashMap();
map.put(names[0],names[1]);
map.put(names[0],names[2]);
map.put(names[0],names[3]);

Read Hash map For this
Now list The entires in hash map using the map name .. "names[0]"

Re: How to make an array in text file (help..)
 

Look at your code:

for (line = lnr.readLine(); line!=null; line = lnr.readLine()){



String account[] = new String[4];

int count = 0;





int accountNumber[] = Integer.parseInt(account[count][1]);

int pinNumber[] = Integer.parseInt(account[count][2];

int balance[] = Integer.parseInt(account[count][3];

String name = account[count][4];





System.out.println(accountNumber[0][1]);

}

You read the line BUT inside the loop you don't do anything with it. Instead you call this:

Integer.parseInt(account[count][1]);

.
The account array is not 2-D and the Integer.parseInt does not return an array.


Now inside the line you have something like this:
12345 1234 200000 Jerry Lopez

So If you use the split method:

String [] array = line.split(" ");

The elements of the array would be:
0: 12345
1: 1234
2: 200000
3: Jerry
4: Lopez

Also for reading from a file try this shorter version:

BufferedReader lnr = new BufferedReader (new FileReader("accountList.txt"));

Re: How to make an array in text file (help..)
 

oh,,thank you very much for the help guyzz,,,this will be a great help...

ah now i see,,,

so if i will use string.split...

how will i declare the variables?????will it be the same with what i did???...i am really confused anyway...

Re: How to make an array in text file (help..)
 

for (line = lnr.readLine(); line!=null; line = lnr.readLine()){



String account[] = line.split(" ");



//print whatever you want

//and do whatever you want with the elements:

//account[0], account[1], account[2], account[3], account[4]



}

Re: How to make an array in text file (help..)
 

thank you,,,thank you very much "java addict"...this is such a great help...thank you....,,

Re: How to make an array in text file (help..)
 

for (line = lnr.readLine(); line!=null; line = lnr.readLine()){

String account[] = line.split(" ");

//print whatever you want
//and do whatever you want with the elements:
//account[0], account[1], account[2], account[3], account[4]

}

hello, i have tried what you told me...

but when i print
System.out.println(account[0]);

it prints the whole line which is:

12345 1234 200000 Jerry Lopez

i think this is a two dimensional array...

i only want to print out the 12345...but i am really confused either....

thank you in advance........

Re: How to make an array in text file (help..)
 

for (line = lnr.readLine(); line!=null; line = lnr.readLine()){

String account[] = line.split(" ");

//print whatever you want
//and do whatever you want with the elements:
//account[0], account[1], account[2], account[3], account[4]

}

hello, i have tried what you told me...

but when i print
System.out.println(account[0]);

it prints the whole line which is:

12345 1234 200000 Jerry Lopez

i think this is a two dimensional array...

i only want to print out the 12345...but i am really confused either....

thank you in advance........


what if i have this in my accountList.txt...
12345 1234 200000 Jerry Lopez
23456 2345 45666 Letty Mae

what if i want to print out the 23456?????....

i am really confused either...maybe i am not that good in text file and how to make arrays
with it....

i hope you can help me...

Re: How to make an array in text file (help..)
 

I have tried this:

public static void main(String[] args) {

                BufferedReader lnr = null;

                String line = null;

                try {

                        lnr = new BufferedReader (new FileReader("accountList.txt"));

                        for (line = lnr.readLine(); line!=null; line = lnr.readLine()) {

        

                                String account[] = line.split(" ");

                                

                                System.out.println(account[0]);

                        }

                        

                        lnr.close();

                } catch (Exception e) {

                        System.out.println("An error has occured: "+e.getMessage());

                        //e.printStackTrace();

                }

        }

The file has these:
And it printed:

12345
55555

Re: How to make an array in text file (help..)
 

what if i will only print out the:

12345???

it seems that the 55555 was printed out also because it was stored in [0] array...so i think,,it should be;;

account[1][0] so that it will only print the 12345.....

and i am really confused either,,,on how to do it....i am not that good in text file really...