How deep one understands database indicates how fast one can debug and in general, how good one is at full-stack development… Says Michael Ball, my Software Engineering professor (My Database professor didn’t say something like this though).

A framework update for the whole site and the end of summer holidays.

Various scenarios of undoing commits in Git discussed.

A view in Java Collections Framework is a special lightweight object which implements Map or Collection.

The first questions that keep coming up during the first months using Git probably look like these: How do I undo git add? How do I undo git commit? How do I undo xxx?

Just some random Java design patterns stuff…

Java standard library has several interfaces for collections of objects. For a structure map, see here.

When we write f(n) = O(n) what we truly should write is f(n) ∈ O(n).

How to batch convert file encoding in Bash.

我们这地球上的人，从出生开始，就一直在鬼门关前面排着队。医生的作用，则是把付钱给他的人拽到队伍后面去。