public Set<String> getSectionNames() {
        return Collections.unmodifiableSet(sections.keySet());
    }
Returns the names of all sections managed by this {@code Ini} instance or an empty collection if there are
no sections.

@return the names of all sections managed by this {@code Ini} instance or an empty collection if there are
no sections.
config/core/src/main/java/org/apache/shiro/config/Ini.java