Advice to first go through some Java Basics concept and during interview preparation go through all the questions deeply , you can search the solution on google or any AI tool believe me if you did these questions seriously it's more then enough to clear any Java interview,

it's only contains questions that was asked to me in around 50+ interview company like MasterCard, Oracle, Nielson, UKG, Cars24,Infosys,Wielson

and many more...