Java - Write hashmap to a csv file

Question

I have a hashmap with a String key and String value. It contains a large number of keys and their respective values.

For example:

key | value
abc | a         


        

Answer 1

Something like this should do the trick:

String eol = System.getProperty("line.separator");

try (Writer writer = new FileWriter("somefile.csv")) {
  for (Map.Entry entry : myHashMap.entrySet()) {
    writer.append(entry.getKey())
          .append(',')
          .append(entry.getValue())
          .append(eol);
  }
} catch (IOException ex) {
  ex.printStackTrace(System.err);
}