File stream question

Question

I need to read characters or integers from a .txt file and do some calculation to the integer or do something to the characters.
taken from tutorial
import java.io.*;
public class Copy {
public static void main(String[] args) throws IOException {
     File inputFile = new File("farrago.txt");
     File outputFile = new File("outagain.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
while ((c = in.read()) != -1)
out.write(c);
in.close();
out.close();
i need to read in the integers from a .txt file and put it in an array. example
in the somenumber.txt file.
12 34 1
1 3
12 23
Question 1: Is there a way to convert the code from .txt file to an int?
Question 2: What code is the .txt represented in? ANSI? unicode? Is there a URL for the code-table?
Question 3: is the character a in the text == char 'a' ?

Answer 1

The character encoding of a file is independant of the java virtual machine. If you use the FileReader and FileWriter classes, I believe they use the default system encoding. If you know the format of the file then you should be able to do what you want fairly easily. You can use the StringTokenizer class to break up the lines of the file and use Integer.parseInt() to convert the string representations of number into their binary equivalent. Also, if you are using Java 1.4, you may be able to use regex to break the text up and verify proper format at the same time. This would save you the trouble of checking for a NumberFormatException when you call Integer.parseInt()