Openspace Services Software Developer interview questions

First aptitude test of 30 questions from html, DBMS and java (10 question each sec) then one on one interview with their senior developer. Ask everything from basic to advanced Java, made me solve 3 questions one java program, 1 API connection and requests and 1 database design. At the end she suggested my answers were correct but need to be more detailed. Don't just give one line answer give details along with implementation.