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。

我真的希望我们之间随便谁赶紧接个电话离去算了，可是今天是周日，现在是中午，外面有阳光，但是很冷。

Some bit manipulation tricks.