public void start(String[] args){
		try{
			if(args.length == 0){
				processDirectoryTree(new File("."));
			}
			else{
				for(String arg:args){
					File fileArg = new File(arg);
					if(fileArg.isDirectory()){
						processDirectoryTree(fileArg);
					}
					else{
						if(!arg.endsWith("."+ext)){
							arg += "." + ext;
						}
						strategy.process(new File(arg).getCanonicalFile());
					}
				}
			}
		}catch(IOException e){
			throw new RuntimeException(e);
		}
	}