Wissen Software Developer interview questions

Round 1 was as normal only like hashset hashmap questions related to what happen if we take object as a key to hashmap pre condition check should be immutable object should and equal and hashcode should be written properly then what if we return 1 to hashcode how it will behave what if update object post insertions how map will behave then character frequency dsa question immutable class and rest full form what rest api do then round 2 difficult output based inhertiance questions two three and then what id we remove @Service annotation with component and then inventory only one stcok senario based like what happen what sort of db lock etc operation you performed then questions of rotate array from k positon then a stupid questions of number to word very edge case question i explained the approach but didn't comeup to solutions so not selected

The first round is Hacker Rank Second is DSA with Mysql , Oops , Multi Threating Third would be Manager Round with DSA Foruth is HR After Joining the company you have give clinet level interview . After that you will get Project