public void load(String fileName, String encoding)
		throws IOException
	{
		data = Utils.readFile(fileName, encoding);
		this.n = data.length;
	}
This is an {@link ANTLRInputStream} that is loaded from a file all at once
when you construct the object.

@deprecated as of 4.7 Please use {@link CharStreams} interface.
runtime/Java/src/org/antlr/v4/runtime/ANTLRFileStream.java