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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Class of objects from file or URL, factory, Vector and HashMap, select, sort, output
Network Programming example from a Well House Consultants training course
More on Network Programming [link]

This example is described in the following article(s):
   • Flexibility in input - read from file, web resource or keyboard - [link]

Source code: Station.java Module: J808
import java.io.*;
import java.util.*;
import java.net.*;

Read and maipulate station data

Sample data:
8860 PLN AB12 4JS NO 923967 57.061363668 -2.126616063Portlethen 10722 14887 21073 22055 19906 15186 18382 19078 28000

Class of objects from file or URL, factory, Vector and HashMap, select, sort, output

public class Station implements Comparable {
        String tlc;
        String name;
        int pcount;
        public static Station factory(String raw) {
                String [] pieces = raw.split("\t");
                Station added = null;
                try {
                added = new Station(pieces[1],pieces[6],Integer.parseInt(pieces[7]));
                } catch (NumberFormatException e) {}

                return added;
        public Station(String tlc, String name, int pcount) {
                this.tlc = tlc;
                this.name = name;
                this.pcount = pcount;
        public int getPassengers() {
                return this.pcount;
        public String toString() {
                String say = tlc + " " + pcount + " " + name;
                return say;
        public int compareTo(Object that) {
                return this.pcount - ((Station)that).pcount;

// ----------------------------

public static void main(String [] args) throws FileNotFoundException,
                        IOException {

        Vector<Station> nationalRail = new Vector<Station>();
        HashMap codes = new HashMap();
        int counter = 0;

        InputStreamReader instream = null;

        try {
                if (args[0].equals("w"))
                    instream = new InputStreamReader((new URL(args[1])).openStream());
                if (args[0].equals("f"))
                    instream = new FileReader(args[1]);
        } catch (Exception e) {

        if (instream == null) {
                System.err.println("Usage: java Stations w|f url|filename");

        BufferedReader source =
                new BufferedReader(instream);

        String lyne;
        while ((lyne = source.readLine()) != null) {
                Station current = Station.factory(lyne);
                if (current == null) continue;
                int peeps = current.getPassengers();
                if (peeps < 30000 && peeps > 25000) {
        System.out.println("Count of little places " + counter);


        System.out.println("Selected mediumish stations in order");
        for (int k=0; k<nationalRail.size(); k++) {



Learn about this subject
This module and example are covered on our public Java Extra course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

Books covering this topic
Yes. We have over 700 books in our library. Books covering Java and associated technologies are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Network Programming" training module. You'll find a description of the topic and some other closely related examples on the "Network Programming" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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• And there's a global index here.

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