Walgreens Boots Alliance interview question

1) How Java JVM works 2) Talk about Java data structures 3) Big O notations and tradeoffs 4) LinkedHashMap 4) Thread safety 5) JSON Library in Java 6) Java Script > Hoisting 7) Currency in Java 8) Handle rounding errors in Java 9) SQL Injections in Java Microservices failures 10) What project you would scratch and redo it? 11) How do you learn new tech? 12) Top 2 improvements made by you.