How to check a file if exists with wildcard in Java?

Question

I have a directory, and inside it are files are named \"a_id_XXX.zip\".

How do check if a file exists given an id and File dir

Answer 1

Java 7 has some good support for pattern matching (PathMatcher) and recursive directory walking (Files.walkFileTree()). In the context of the original question, this page in Oracle's Java documentation is a good start:

Finding Files: http://docs.oracle.com/javase/tutorial/essential/io/find.html