QuinStreet Interview Question

1. difference between set and list, which one is better for delete and insert 2. Array.size(), what will it return 3. String a = "abc" , String b = "abc". What will a== b return? 4. Difference between declaring String a = "abc"and String b = new String(abc) 5. Difference between stack and heap 4. what is lazy loading, hibernate, left join, explain plan, how will you tune a query? 5. Question on hibernate annotations 6. What do you use Maven for