java CollationKey sorting wrong

I have a problem in comparing strings.I want to compare two "éd" and "ef" french texts like this

Collator localeSpecificCollator = Collator.getInstance(Locale.FRANCE);
CollationKey a = localeSpecificCollator.getCollationKey("éd");
CollationKey b = localeSpecificCollator.getCollationKey("ef");
System.out.println(a.compareTo(b));

This will print -1, but in french alphabet e come before é. But when we compare only e and é like this

Collator localeSpecificCollator = Collator.getInstance(Locale.FRANCE);
CollationKey a = localeSpecificCollator.getCollationKey("é");
CollationKey b = localeSpecificCollator.getCollationKey("e");
System.out.println(a.compareTo(b));

result is 1. Can you tell we what is wrong in first part of code?