Onsite interview 1: A paper test, questions including Java syntax, SQL, JavaScript, code review. Java syntax question is: given a method: int exchange(int a), we need: if a == 1 return 2, if a == 2 return 1. Give 4 methods to implement the method, "if" statement cannot be used. SQL question was about nested queries and aggregation. JavaScript question was to write a JavaScript function, when a radiobox is checked then alert sth. Code review question is an implementation of tree level traverse algorithm, lot of errors.

Onsite interview 2: Algorithm questions and OOD. 1, sort a deck of cards, you can choose your own sorting algorithm, you need to show how the algorithm work to the interviewer. 2, How to shuffle the cards. 3, using OOD to represent math expression like 1 + 2 * 3, need to implement calculate and toString methods.

Onsite interview 3: Some Java and OOP questions., then a code review, cannot remember exactly, Just remember, you need to check null pointers, make unused object point to null in order to make it eligible for garbage collection, synchronization if the methods were used in a multi-thread system. Last question is given an axis and lots of points. You are given a point as the the centre of a circle, and given the radius of the circle, find out how many points in the circle.