1 Static variables and methods What are the characteristics that can not access non-static member, and why?
Static methods can not be overridden, and why. Parent-child class method call access order
Abstract classes and interfaces member variables What is the difference, class access
HashSet how to achieve the underlying
HashMap how traversal
What are linear structures, binary trees belong to you?
Binary tree has the maximum number of nodes? How many k-level nodes?
Bubble sort how to achieve, how to optimize, two layers of each loop is doing.
The difference between multiple threads wait and sleep methods, lock
How to achieve the MVC pattern, process description.
Hibernate how the upper and interaction, which databases used, how much understanding.
Handwritten sql: query from 6.1 to now review the number of daily; the number of reviews is greater than 1000 (note the date function)