parseToInt from string in textfile crashing the program

Question

I am trying to generate a hashmap and require some of the strings from a textfile to be integers for the keys. However whenever I try to convert the string to integer the program crashes.

Here is the code below:

BufferedReader in = new BufferedReader(new FileReader("patient.txt"));//create thing to open the file
String line;
while((line = in.readLine())!= null)
{
    String[] text = line.split(",", -1);
    String keyString = text[0];
    String value = text[1] + text[2] + text[3] + text[4];
    int key = Integer.parseInt(keyString);
    System.out.println(key + " " + value);
}

The part that causes the program to crash is the parseInt line. I get the error

at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)

Here's a sample of the text file. I am trying to convert Baker into an integer etc.

Baker, William,     Chavez,     04/01/05,   04/10/06
Sanchez, Jose,      Chavez,     06/15/05,

Answer 1

Handle this exception or Check if the string its really matching to number format:

String input=...;
String pattern ="-?\\d+";
if(input.matches("-?\\d+")){ // any positive or negetive integer or not!
 ...
}

Answer 2

Your data does not allow that, if you look carefully into your code, you can see that String keyString = text[0]; is giving your "Baker" for the first line, which is not an integer.