extracting keys from treemap object

This question already has an answer here:

Iterate through a HashMap [duplicate] 7 answers

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You're throwing away the results from your iterator. Keep the entry and you can access the key and value for printing:

Iterator<Map.Entry<String, String>> i = emailDetailTree.entrySet().iterator();
while(i.hasNext()) {
    Map.Entry<String, String> entry = i.next();
    ...

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