Error java.lang.NumberFormatException: For input string: ""

Question

I'm trying to read this file

C101

VEHICLE
NUMBER     CAPACITY
  25         200

CUSTOMER
CUST NO.  XCOORD.   YCOORD.    DEMAND   READY TIME  DUE DATE   SERVICE   TIME

    0      40         50          0          0       1236          0   
    1      45         68         10        912        967         90   
    2      45         70         30        825        870         90   
    3      42         66         10         65        146         90   
    4      42         68         10        727        782         90   
    5      42         65         10         15         67         90   
    6      40         69         20        621        702         90   
    7      40         66         20        170        225         90   
    8      38         68         20        255        324         90

But when I read the file, the program throws me this exception:

Exception in thread "main" java.lang.NumberFormatException: For input string: ""
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:504)
    at java.lang.Integer.parseInt(Integer.java:527)
    at VRP.main(VRP.java:43)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

I cheked my code and debugged, but I can't find the problem.

I used an array to save all the spaces between the columns (I only read the first four columns) and then an ArrayList but it doesn't worked.

    public static void main(String[] args) throws Exception {

    File f = new File("C101.txt");
    FileReader fr = new FileReader(f);
    BufferedReader reader = new BufferedReader(fr);

    String nada = reader.readLine();  //C101
    nada = reader.readLine();         //espacio en blanco
    nada = reader.readLine();         //vehicle=25
    nada = reader.readLine();         //number, capacity
    nada = reader.readLine();         //25, 200
    nada = reader.readLine();         //espacio en blanco
    nada = reader.readLine();         //customer
    nada = reader.readLine();         //encabezados
    nada = reader.readLine();         //espacio en blanco

    String[] espacios;
    int capacity = 200;
    int custno, xcoord, ycoord, demand;

    ArrayList<String> guardar = new ArrayList<String>();

    while (reader.ready()) {
        espacios = reader.readLine().trim().split(" ");
        for (int i = 0; i < espacios.length; i++) {
            guardar.add(espacios[i]);
        }
        custno = Integer.parseInt(espacios[0]);
        xcoord = Integer.parseInt(espacios[1]);
        ycoord = Integer.parseInt(espacios[2]);
        demand = Integer.parseInt(espacios[3]);
    }
}

Sorry for the inconvenient and thank you for your time.

Reimeus · Accepted Answer · 2015-11-07 22:27:13Z

3

You're splitting on a single space but there is more than one space between the integer columns

espacios = reader.readLine().trim().split("\\s+");

edited Nov 7, 2015 at 22:27

answered Feb 3, 2014 at 0:29

Reimeus

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1 Comment

Reimeus Over a year ago

It's likely that that this fixed the problem but that the extraneous line at the end of the file caused the same problem later while reading the file

La-comadreja · Accepted Answer · 2014-02-03 00:11:55Z

1

You got to make sure that espacios[0] through espacios[3] are actually integers. What you should probably do is print them out to check. If one of them isn't an integer, Integer.parseInt() will throw that exception.

answered Feb 3, 2014 at 0:11

La-comadreja

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3 Comments

ArCiGo Over a year ago

But all the numbers are Integers

Hovercraft Full Of Eels Over a year ago

@ArCiGo: you've got to either use a debgger or println anything. Throw all assumptions out the window. 1+ to the answer.

ArCiGo Over a year ago

I found the mistake: at the end of the .txt file a blank space was left by the author

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