What kind of questions can be expected for Oracle senior Java developer interview ?

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I had an interview with the oracle last week. The interview started with a simple program and then he asked me some basic collection questions that's it. Within 5min I got a call from the recruiter saying that you are selected for the next rounds. That's it.

1. The program was very simple. He just wanted to count the words in the string and then total unique characters from that string.
2. The basics collection questions, like what is the difference between treeset and HashSet and linkedHashset

3. And some questions on project that's it.

What level did you interview for?

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