SAP Software Developer In Test interview questions

Applied it online through Employee Referral, got a call from Recruiter within 2 days and then followed by Telephonic interview by the Hiring Manager within a week . After the telephonic interview, I was called for onsite interview with 5 more people. The interview process was fairly decent. However, I am yet to receive any update from the recruiter.

Telephonic and 3 rounds of java questions and all the java rounds or on core java in depth in collection framework,threads and Interface class diff,inheritance and basic oops concepts,method overloading and method overriding,type casting of objects, file handling ,runtime polymorphism and compile time polymorphism ,string speciality in java,what is immutable in java