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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]
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) { System.err.println(e); } if (instream == null) { System.err.println("Usage: java Stations w|f url|filename"); System.exit(1); } 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) { nationalRail.add(current); } codes.put(current.tlc,current); } System.out.println("Count of little places " + counter); Collections.sort(nationalRail); System.out.println("Selected mediumish stations in order"); for (int k=0; k<nationalRail.size(); k++) { System.out.println(nationalRail.get(k)); } System.out.println(((Station)codes.get("SWA")).name); } } Learn about this subject
This module and example are covered on our public Java Extra course. If you have a group of
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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.
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