# close method

1. @override
2. @mustCallSuper

Future<void> close()
override

Closes this output stream and releases any system resources associated with this stream.

A closed stream cannot perform output operations and cannot be reopened. The close method of OutputStream calls flush before closing the stream.

## Example

    final output = FileOutputStream('output.txt');
    try {
      await output.writeString('Hello, World!');
      // flush() is called automatically by close()
    } finally {
      await output.close(); // Always close in finally block
    }

Throws IOException if an I/O error occurs.

## Implementation

    @override
    @mustCallSuper
    Future<void> close() async {
      if (!_closed) {
        _closed = true;
      }
    }