java - Storing Data from File into an Array -

so have text file items this:

350279 1 11:54 107.15  350280 3 11:55 81.27  350281 2 11:57 82.11  350282 0 11:58 92.43  350283 3 11:59 86.11 

i'm trying create arrays values, in first values of each line in array, second values of each line in array, , on.

this code have right now, , can't seem figure out how it.

package sales;  import java.io.file; import java.io.filenotfoundexception; import java.util.scanner;  public class sales {      public static void main (string[] args) throws filenotfoundexception {          scanner reader = new scanner(new file("sales.txt"));         int[] transid = new int[reader.nextint()];         int[] transcode = new int[reader.nextint()];         string[] time = new string[reader.next()];         double[] trasamount = new double[reader.hasnextdouble()];       } } 

it's difficult build array way, because arrays have fixed size... need know how many elements have. if use list instead, don't have worry knowing number of elements in advance. try (note: there no error checking here!):

public static void main (string[] args) throws filenotfoundexception {     scanner reader = new scanner(new file("sales.txt"));     list<integer> ids = new linkedlist<>();     list<integer> codes = new linkedlist<>();     list<string> times = new linkedlist<>();     list<double> amounts = new linkedlist<>();      // load elements lists. note: can use lists if want     while(reader.hasnext()) {         ids.add(reader.nextint());         codes.add(reader.nextint());         times.add(reader.next());         amounts.add(reader.nextdouble());     }      // create arrays     int[] idarray = new int[ids.size()];     int[] codesarray = new int[codes.size()];     string[] timesarray = new string[times.size()];     double[] amountsarray = new double[amounts.size()];              // load elements arrays     int index = 0;     for(integer : ids) {         idarray[index++] = i;     }     index = 0;     for(integer : codes) {         codesarray[index++] = i;     }     index = 0;     for(string : times) {         timesarray[index++] = i;     }     index = 0;     for(double : ids) {         amountsarray[index++] = i;     } }