Question

I’m trying to save a .properties file with entries sorted alphabetically using this class:
SortedProperties

Like this:

File file = new File(fullPathToCfgFile);
FileOutputStream os = new FileOutputStream(file);
getProperties().store(os, null);
os.close();

private static SortedProperties getProperties() {
    SortedProperties properties = new SortedProperties();
    Field[] fields = Settings.class.getDeclaredFields();
    for (int i = 0; i < fields.length; i++) {
        String fieldName = fields[i].getName();
        if (fieldName.startsWith("_")) {
            try {
                properties.put(fieldName, "" + fields[i].get(null));
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    return properties;
}

The problem is keys() from SortedProperties is never called, so the saved file is not sorted.

Answer 1

I tested your code and keys() is definitely invoked by store().

I don’t know what issues you are encountering, but it doesn’t look to be in SortedProperties.