Reading file and parseInt - PROBLEM

Question

Hi, I am trying read from .txt file but I have a problem when I use Integer.parseInt. Can you see what could be wrong in this source:
public String loadPlayerFromTxt() {
String result = "";
try{
FileInputStream fstream = new FileInputStream("Test.txt");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
int position = 0;
while ((br.readLine()) != null) {
Gamer gamer = new Gamer();
gamer.setName(br.readLine());
gamer.setRace(br.readLine());
gamer.setRole(br.readLine());
gamer.setLevel(Integer.parseInt(br.readLine()));
String [] array = new String [6];
String abilities = br.readLine();
String str = abilities.trim();
//System.out.println(abilities);
array = str.split(",");
gamer.setStrength(Integer.parseInt(array[0]));
gamer.setEndurance(Integer.parseInt(array[1]));
gamer.setDexterity(Integer.parseInt(array[2]));
gamer.setIntelligence(Integer.parseInt(array[3]));
gamer.setWisdom(Integer.parseInt(array[4]));
gamer.setCharisma(Integer.parseInt(array[5]));
this.gcollection.addGamer(gamer,position);
position++;
result = "succesful";
in.close();
catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
e.printStackTrace();
e.getLocalizedMessage();
return result;
Error message is:
Error: For input string: "12, 15, 19, 9, 14, 7"
java.lang.NumberFormatException: For input string: "12, 15, 19, 9, 14, 7"
     at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
     at java.lang.Integer.parseInt(Integer.java:456)
     at java.lang.Integer.parseInt(Integer.java:497)
     at ca5.GameControle.loadPlayerFromTxt(GameControle.java:56)
     at ca5.GameControle.main(GameControle.java:112)

Answer 1

Pavel.Prochy wrote:
Hi, I am trying read from .txt file but I have a problem when I use Integer.parseInt. Can you see what could be wrong in this source:
Error: For input string: "12, 15, 19, 9, 14, 7"
java.lang.NumberFormatException: For input string: "12, 15, 19, 9, 14, 7"The Integer.parseInt() method expects a String that contains only numbers. You are passing it the following string:
12, 15, 19, 9, 14, 7Which contains punctuation and whitespace (i.e. not just numbers). When the string you pass to Integer.parseInt() contains anything but numbers you get the "NumberFormatException" thrown. What you need to do is to do some pre-processing on the string you read from the file or (ideally) change the format of the file so that you have each of the numbers on their own line rather than having multiple numbers on the same line. If you HAVE to keep all the numbers on the same line then you will need to do the following (or something very similar to it):
public class Tester3 {
    public static void main(String[] args) {
       String input = "12, 15, 19, 9, 14, 7";
       String[] strings = input.split(",");
       for(String string : strings) {
            int parameter = Integer.parseInt(string.trim());
            System.out.println("parameter: "+parameter);
}Program output from above code:
parameter: 12
parameter: 15
parameter: 19
parameter: 9
parameter: 14
parameter: 7When you use the Integer.parseInt() call you should consider the possibility that your input will cause the call to fail. You can pre-process the input to ensure it will not fail, catch the NumberFormatException by wrapping the call to Integer.parseInt() in a try-catch block or create a method in your class that throws a NumberFormatException to its caller and let the caller handle the error
Edited by: amp88 on Nov 4, 2009 2:26 AM
Edited by: amp88 on Nov 4, 2009 2:27 AM