How can I write Java properties in a defined order?

Question

I\'m using java.util.Properties\'s store(Writer, String) method to store the properties. In the resulting text file, the properties are stored in a haphazard order.

Answer 1

Steve McLeod's answer used to work for me, but since Java 11, it doesn't.

The problem seemed to be EntrySet ordering, so, here you go:

@SuppressWarnings("serial")
private static Properties newOrderedProperties() 
{
    return new Properties() {
        @Override public synchronized Set> entrySet() {
            return Collections.synchronizedSet(
                    super.entrySet()
                    .stream()
                    .sorted(Comparator.comparing(e -> e.getKey().toString()))
                    .collect(Collectors.toCollection(LinkedHashSet::new)));
        }
    };
}

I will warn that this is not fast by any means. It forces iteration over a LinkedHashSet which isn't ideal, but I'm open to suggestions.