Managing resources#

Files, sockets, and response bodies need to close when you finish using them. Use with to register that close operation for the end of a block, including early returns and errors.

1. Using with
2. Closing a resource
3. Implementing Closeable
4. Cleanup order
5. Cleanup failures

A reference keeps an object accessible; it does not keep a closed resource open. See mutation and references . Continue with files and paths for a concrete library API.