You need to sign in to do that
Don't have an account?

call a standard process in a class
How do you call a standard process like Submit for Approval (Workflow Approval process) in a Custom controller class?
You need to sign in to do that
Don't have an account?
So you can use that class to submit that record for approval.
You will get more information in apex language reference guide.
Link is here http://www.salesforce.com/us/developer/docs/apexcode/index.htm