这是什么？

没有明确目的的代码集合

可能类似于随笔、涂鸦、草稿等等

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What's this?

A group of code without explicit purpose.

Maybe just essay, scrawl, draft and the like.

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JAVA

Antlr demo for version 4.7

Open replicator demo

Jackson demo

Python

Opencv step by step

Http practice: a simple tcp chatroom