Parse command line in java

public static void main(String[] args) throws Exception
	{
		// parse arguments
		Map<String, String> params = new HashMap<String, String>();
		for (int i = 0; i < args.length; i++) {
			String k = args[i], v = null;
			assert (k.startsWith("-"));
 
			// see if there's a value following
			int j = i + 1;
			if (j < args.length) {
				String _v = args[j];
				if (!_v.startsWith("-")) {
					v = _v;
					i++;
				}
			}
 
			params.put(k, v);
		}
	}