Java - Converting byte array to a python dictionary-like object

Question

I'm trying to migrate an application from Python to Java, which I'm a complete noob, but I have encountered a problem.

In python I receive bytes through the serial ports and I'm able to split the data in a single line by doing just like so:

temp = temp.decode("utf-8").split(',')

Example data:

S,24,31479873,00000,00000,00000,3296,

So it'd be divided to a list of elements, like so:

['S', '24', '31479873', '00000', '00000', '00000', '3296', '\r\n']

And I'd be able to loop through a key list and relate that list to this split list. Appending the result to a list of dictionaries called "packages".

key = ["type", "line_number", "timestamp", "hits", "pulses", "hits_acc", "voltage", "unused"]
self.packages.append({key[i]:temp[i] for i in range(len(key))})

I want the exact same functionality in Java. Can anyone guide me through this? Sorry if I'm being too vague but I'm a complete beginner when it comes to Java.

Looks like you're trying to create a csv structure keyed by column name. You could either roll your own using Map<String, List<String>> (keys are column headers, values are a list of column values) or use a csv API such as OpenCSV, which generally allow the data columns to be accessed using the column header as a key — g00se
– g00se, Commented Sep 8, 2022 at 23:31

Daniel · Accepted Answer · 2022-09-09 06:25:21Z

1

Java is strong typed language , so the code may seems a little complex, as follows:

String line = "S,24,31479873,00000,00000,00000,3296,x";
        String [] parts = line.split(",");
        String [] cols = {"type", "line_number", "timestamp", "hits", "pulses", "hits_acc", "voltage", "unused"};
        if (parts.length != cols.length) {
            System.out.println("Data invalid");
            System.exit(-1);
        }
        Map<String, String> result = new HashMap<>();
        for (int i = 0; i < cols.length; i++) {
            String key = cols[i];
            String val = parts[i];
            result.put(key, val);
        }

answered Sep 9, 2022 at 6:25

Daniel

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1 Comment

Vinícius Over a year ago

Thanks! I implemented this using a Stringbuffer since I'm receiving data from a serial interface. I think it'll work porperly now!

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