How to Reverse HashMap, key becomes values and vice-versa

I have a HashMap with key-values. Sometime, I need to know key for a given value. Could anyone let me know how to do that ?
vinay_delhiAsked:
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applekannaCommented:
import java.util.*


  HashMap h = new HashMap();
     Iterator i = h.entrySet().iterator();
     while(i.hasNext())
     {
      Map.Entry entry = (Map.Entry)i.next();
     System.out.println(entry.getKey() + "/" + entry.getValue());
   //  if((Object) entry.getValue() == your code to compare
     }
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applekannaCommented:
Assuming you have string for both key and value
     {
      Map.Entry entry = (Map.Entry)i.next();
     System.out.println(entry.getKey() + "/" + entry.getValue());
     String key =  (String) entry.getValue()
     String value = (String) entry.getValue();
   //  if(value.equals("some")
     }
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