How can I write Java properties in a defined order?

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As per “The New Idiot’s” suggestion, this stores in alphabetical key order.

Properties tmp = new Properties() {
    @Override
    public synchronized Enumeration<Object> keys() {
        return Collections.enumeration(new TreeSet<Object>(super.keySet()));
    }
};
tmp.putAll(properties);
tmp.store(new FileWriter(file), null);

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