RxLogix Corporation Java J2EE Developer interview questions

1. Different ways of implementing Abstraction? 2. Flow of spring 3. Rest web service requests? 4. one programming question from array ( easy-level ) 5. Singleton class and its usage? 6. Given class what all changes to be made to make it String class ? 7.How do spring get particular Spring Beans in Dependency Injection , which method it uses?