HashMap Keys and Values

I'm trying to get the keys with corresponding values out of a HashMap.  It's easy to get the values, but how do I get the corresponding key?

Here's my code -- assume the hashmap has been filled.

HashMap hm;

Iterator it = hm.values().iterator();
while (it.hasNext()) {

    String value = (String) it.next();
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Iterator it = hm.entrySet().iterator();
while (it.hasNext()) {
    Entry e = (Entry)it.next();
    String key = e.getKey().toString();
    String value = e.getValue().toString();

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iterate on the key:

Iterator it = hm.keySet().iterator();
while (it.hasNext()) {

    String key = (String) it.next();
    String value = (String) hm.get(key);
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