if ( args.length < 2 ) {
System.out.println("Usage: WordSort inputfile outputfile");
return;
}
String inputfile = args[0];
String outputfile = args[1];
/* Create the word map. Each key is a word and each value is an
Integer that represents the number of times the word occurs
in the input file.
*/
Map<String,Integer> map = new TreeMap<String,Integer>();
Scanner scanner = new Scanner( new File(inputfile) );
while ( scanner.hasNext() ) {
String word = scanner.next();
Integer count = map.get( word );
count = ( count == null ? 1 : count +1 );
map.put( word, count );
}
scanner.close();
// get the map's keys
List<String> keys = new ArrayList<String>( map.keySet() );
//Collections.sort( keys );
// write the results to the output file
PrintWriter out = new PrintWriter( new FileWriter(outputfile) );
for ( String key : keys )
out.println( key + " : " + map.get(key) );
out.close();
