The Subject object has several methods, some of which are as follows:

• subject.getPrincipals() returns a set of Principal objects. Because the result is a Set, the operations remove(), add(), and contains() apply.
  
  
• subject.getPublicCredentials() returns a set of the publicly accessible credentials associated with the Subject.
  
  
• subject.getPrivateCredentials() returns a set of the privately accessible credentials associated with the Subject.