问题:

I am taking a String variable from request.

String issueField = request.getParameter("issueno");

This may or may not have a hyphen in the middle. I want to be able to traverse through the String and divide the string when hyphen is seen.

回答1:

Use String#split:

String[] parts = issueField.split("-");

Then you can use parts[0] to get the first part, parts[1] for the second, ...

回答2:

String.split

回答3:

Although String.split will do the job, Guava's Splitter class doesn't silently discard trailing separators, and it's API doesn't force using a regex when it's not needed:

http://guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/common/base/Splitter.html

With respect to your question, here's a code snippet:

Iterable<String> parts = Splitter.on('-').split(issueField);

Some additional bonuses with using Splitter instead of String.split:

The returned Iterable is lazy. In other words, it won't actually do the work until you are iterating over it.
It doesn't split all of the tokens and store them in memory. You can iterate over a huge string, token-by-token, w/o doubling up on memory usage.

The only reason not to use Splitter is if you don't want to include Guava in your classpath.