CIS 260 CreateData02.java

Code

/*
    CreateData02.java
    David Klick
    2005-01-26

    Create population binary data file for assignment 2
    from text data file.
*/

import java.io.*;
import java.util.StringTokenizer;

class CreateData02 {
    public static void main(String[] args) throws IOException {
        String filename = "popdata";

        // open input file (plain text, field separator = ' ')      
        BufferedReader ifile = new BufferedReader(
            new FileReader(filename + ".txt"));

        // open output file
        DataOutputStream ofile = new DataOutputStream(
            new FileOutputStream(filename + ".dat"));

        String linein = ifile.readLine();
        while (linein != null) {  // readLine returns null at end of file
            // each record is a country name followed by 16 ints
            byte[] bytCountry;
            int[] pop = new int[16];

            // grab country name, replace '_' chars with ' '
            // (spaces within names were replaced with '_' since
            //  spaces are being used as field separators)
            StringTokenizer tok = new StringTokenizer(linein);
            bytCountry = tok.nextToken().replace('_', ' ').getBytes();

            // grab 16 int fields
            // should add error-checking, but this will only be run once
            for (int i=0; i<pop.length; i++) pop[i] = Integer.parseInt(tok.nextToken());
            System.out.println(bytCountry.length + ", " +
                new String(bytCountry) + ", " + pop[0]);

            // write country name to output file, pad with spaces if needed
            int nchars = 0;
            while (nchars<20 && nchars<bytCountry.length) {
                ofile.writeByte((int)bytCountry[nchars++]);
            }
            while (nchars++<20) ofile.writeByte((int) ' ');

            // write poulation data to output file
            for (int i=0; i<pop.length; i++) ofile.writeInt(pop[i]); 
            linein = ifile.readLine();
        }
        ifile.close();
        ofile.close();
    }
}