Oracle

in round 1 first they asked me to explain one particular project by pointing it so i explained that in some 10mins then he gave a paper and asked some dsa questions. he started from basics like what does stack do like that and asked 2 to 3 dsa questions(1 array,2 stack related) easy-medium level ones in round2-first i was asked another dsa question this time on arrays again and then asked me oops concepts like what is difference between encapsulation and abstraction like that and told me to create a class using real world situation random one to test how am i thinking in round3 (hr type round)-here he asked me to explain any project from my resume then discussed some basic hr questions and stuff and again was asked basic oops question