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Final example application
this example from a Well House Consultants training course
Source code: MF.java Module: J715
import java.io.*; import java.util.*; public class MF { public static void main(String [] args) { Hashtable info = read_data("postcodes"); report_on(info,args[0]); } private static Hashtable read_data(String infile) { File Source = new File(infile); if (! Source.exists()) { System.err.println("No data file available"); } BufferedReader Input=null; try { Input = new BufferedReader( new FileReader(Source)); } catch (IOException e) { System.err.println("Cannot open file for read"); } boolean havedata = true; Place current; Hashtable Lookup = new Hashtable(); while (havedata) { try { String FromFile = Input.readLine(); if (FromFile != null) { current = Place.make(FromFile); if (current != null) { String atplace = current.getName(); Stack Table = (Stack) Lookup.get(atplace); if (Table == null) { Table = new Stack(); Table.push(current); Lookup.put(atplace,Table); } else { Table.push(current); } } } else { havedata=false; } } catch (IOException e) { System.err.println("Problem reading data"); havedata=false; } } return (Lookup); } private static void report_on(Hashtable Lookup,String where) { Vector report = (Vector)(Lookup.get(where)); for (int i=0;i<report.size();i++) { Place current = (Place) (report.elementAt(i)); System.out.print(where+" - "+current.getCounty()); System.out.print(" ... postcode is "+current.getPostcode()); System.out.println(" ... Area is "+current.getArea()); } } } Learn about this subject
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