Shulou(Shulou.com)05/31 Report--

This article is about how to analyze Buffer objects in Java NIO, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

In the buffer, the following three most important attributes work together to track changes in the internal state of the buffer:

Position: specifies the next element index to be written or read, whose value is automatically updated by the get () / put () method, and position is initialized to 0 when a new Buffer object is created.

Limit: specify how much data still needs to be fetched (when writing to the channel from the buffer), or how much space is left to put the data (when reading from the channel into the buffer).

Capacity: specifies the most big data capacity that can be stored in the buffer. In fact, it specifies the size of the underlying array, or at least the capacity of the underlying array that we are allowed to use.

There are some relative relationships between the above four attribute values: 0

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