java develop interview questions summary (update)

1. What is sql injection, how to prevent sql injection (two kinds) 

2, database index

3, interfaces and abstract classes What is the difference

4, collections (containers) in Java

5、HashMap & HashTable

6、StringBuffer & StringBuilder

7, thread creation method

8, how to implement thread synchronization

9, runtime exception

10, database optimization

. 11, Spring Framework (IOC, AOP)

12 reasons for the slow page loads, the solution

13, the storage engine

14、statement & preparedstatement