When you define the package to be used outside, if you do not follow certain norms, it will appear annoying green stripe pattern, but also a warning:
While not affect the operation, but also annoying, so how to solve this problem?
Add as a structure or a variable or method comment, and the name must start with a structure or a variable or method, plus a space, plus description
So that no annoying green stripe pattern, and also need to pay attention to the need to specify the name when declaring the structure, namely q * Queue, can not use this to refer to q or self, or there will be a warning:
