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Combined demonstration - phase 2
this example from a Well House Consultants training course
Source code: Combo2.java Module: J050
/* Combined demonstration - phase 2
*/ // ----------------------------------------- Framework.java import java.util.*; public class Framework { public static void main (String [] args) { MyStream StationSource = new MyStream("rstats2014.xyz"); HashMap NationalRail = Station.factory(StationSource); System.out.println(NationalRail.get("LAS")); ArrayList Codes = MyUtils.sortedList(NationalRail); MyUtils.print(NationalRail,Codes); } } // ----------------------------------------- MyStream.java import java.io.*; public class MyStream { BufferedReader Source; String Refname; public MyStream (String name) { Source = null; try { Source = new BufferedReader(new FileReader(name)); Refname = name; } catch (Exception e) { } } public String readLine() { try { return Source.readLine(); } catch (Exception e) { return null; } } } // ----------------------------------------- MyUtils.java import java.util.*; public class MyUtils { public static ArrayList sortedList(HashMap NationalRail) { // A way of stepping through all the elements of a HashMap Set stepThru = NationalRail.keySet(); Iterator stepIt = stepThru.iterator(); // Step through them and put them (keys) into an ArrayList // (which IS Sortable) ArrayList Codes = new ArrayList(); while (stepIt.hasNext()) { String tlc = (String)stepIt.next(); Codes.add(tlc); } // Phew! we can sort it! Collections.sort(Codes); return Codes; } public static void print(HashMap NationalRail, ArrayList Codes) { // Step through the sorted ArrayList, selecting each item from the HashMap in the // sorted order for (int k=0; k<Codes.size(); k++) { Station xxx = (Station)(NationalRail.get((String)(Codes.get(k)))); System.out.println(xxx); } } } // ----------------------------------------- Station.java import java.util.*; public class Station { /* Sample data record 4223 LAS SA7 9RY SS 697976 51.6615015093 -3.8847136298 Llansamlet 20397 20031 18530 22670 30572 25558 32330 32550 34008 33200 */ String tlc; float lati; float longi; String name; int pc; private Station(String TLC, float lati, float longi, String name, int annualPassengers) { this.tlc = TLC; this.lati = lati; this.longi = longi; this.name = name; this.pc = annualPassengers; } public static Station producer(String raw) { String [] f = raw.split("\t"); Station current = null; try { current = new Station( f[1], /* Three letter code */ Float.parseFloat(f[4]), Float.parseFloat(f[5]), f[6], /* Name */ Integer.parseInt(f[f.length-1]) ); } catch (Exception e) { } return current; } public static HashMap factory(MyStream Source) { HashMap NationalRail = new HashMap(); String record ; while ((record = Source.readLine()) != null) { Station current = Station.producer(record); if (current != null) { String tlc = current.getTLC(); NationalRail.put(tlc,current); // System.out.println(current); } } return NationalRail; } public String getTLC() { return tlc; } public String toString() { return name + " [" + tlc + "]"; } } Learn about this subject
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