Java - write output stream to memory (OutputStream to byte array)

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import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

class Program {

    public static void main(String[] args) throws IOException {

        byte[] bytes; 
        try (ByteArrayOutputStream memoryStream = new ByteArrayOutputStream()) {
            OutputStream outputStream = (OutputStream) memoryStream;
            // ...
            bytes = memoryStream.toByteArray();
        }
        // ...
    }
}