How can I read a line of numbers in a file?

Question

Hello everybody,
I have a ziped.file organized in this way:
number1 number 2 number3 name1, name2, name3
number_of points information_about_number_of_point
number4 number4 number4 number4
number4 number4 number4 number4
number4 number4
number5 number5 number5 number5 number5 number5
number5 number5 number5 number5 number5 number5
number5 number5 number6 number6 number6 number6
number6 number6 number6 number6 number6 number6
number6 number6
My problem is to save number1 number 2 number3 and in number_of points in 3 different variable, and number4 number5 and number 6 in 3 different array. How can I do this?
The beginning of my file is:
10000 3.50000 0.00000 Teff, logg, [M/H]
52790 number of wavelength points
1.000000000000000e+01 1.200000000000000e+01 1.400000000000000e+01 1.600000000000000e+01 (end of3th line)
1.800000000000000e+01 2.000000000000000e+01 2.200000000000000e+01 2.400000000000000e+01 (end of 4th line)
The number 52790 is the same for number4, number 5 and number6.
Number4 are organized in 4 columns, number5 and 6 in 6 coloums and the spacing is always the same.
Could you help me please?Thank you and sorry for my terrible english!

Answer 1

I'm not sure if I understand completely, but basically you just need to read & parse your files.
Use a lexer/parser tool like JavaCC if it's advanced parsing, or if it's something very simple (like assigning variables) then you can just use the String.split() method to break up your file into tokens. See below for examples of the "simple way"...
If you have any questions, don't hesitate to ask!
I need to save my informazioni in this way:
var1=number1
var2=number2
var3=number3If you wish to access these variables in a Java program, you could split up your file into tokens and then place the values in a map (variable/value pairs). I don't know how efficient this is, but it works nicely. You can change this for arrays, objects, etc.. right now it's only set up for ints.
Here's a very simple example with some code. Below is the text file...
my_var = 123
my_age = 16
x_pos  = 2
err=2 //syntax error. must separate tokens with whitespaceTo get your variables from the text file:
Map<String, Integer> map;
//read text file and put it into string
//then use tokenExample to get a Map for that string
map = tokenExample(textfileString); //see below
//and finally assign your variables
int my_var = map.get("my_var");
int my_age = map.get("my_age");
int x_pos  = map.get("x_pos");
The tokenExample(String) method
This method breaks the speified string into tokens, and returns a Map with all of the variable name/value pairs in the string.
  public static Map<String, Integer> tokenExample(String text) {
       //Sets up our tokens.
     final String ASSIGN   = "=";
       final String NUMBER   = "\\d+";
       final String VARIABLE = "[a-zA-Z]([a-zA-Z]|_|[0-9])*";       
       //Map for our variable/value pairs
       Map<String, Integer> variables = new Hashtable<String, Integer>();
       String[] splitText = text.split("\\s+"); //Splits by whitespace
       String varName = null;
       boolean assigning = false;
       //cycles through each token and decides what to do
       for(String value : splitText) {        
         //if it's a variable, we set up it's name for later
         if (value.matches(VARIABLE)) {
          varName = value;
         //if it's an assignment operator, we get ready to assign the variable
         else if (value.matches(ASSIGN)) {
           assigning = true;
         //if it's a number, we put it into our hashmap
         else if (value.matches(NUMBER)) {
              //if there's no problem with the last two tokens
           if (varName!=null & assigning==true) {
             variables.put(varName, Integer.parseInt(value));
             assigning=false; //reset for next time
             varName=null;
         //some sort of syntax error
         else {
           assigning=false;
           varName=null;
           System.err.println("Syntax error: cannot find token "+value);
       }//end loop
       return variables;
  }See also:
http://mindprod.com/jgloss/regex.html
http://java.sun.com/docs/books/tutorial/extra/regex/
http://www.javaregex.com/tutorial.html