Question

I am working on a parser which parses delimited text. Example

position 1-10: field a
position 11-20: field b
position 21-30: field c
etc

Any design patterns I can use to implement? I believe I should be using Visitor pattern

Answer 1

Visitor pattern?! Just read the file line by line and use substring():

String line = //...
String a = line.substring(0, 10);
String b = line.substring(10, 20);
String c = line.substring(20, 30);

Am I missing something? Can you clarify your question?