Iterate thru a HashMap() to view its keys and values

Question

I need to iterate over the hashmap to view its keys and values
but the hashmap in 1.5 doesnt return itearor
is there another way to view the key and value in the hashMap
HashMap<String, Integer> colMap = new HashMap<String, Integer>();
String[] array = { "Internal", "Transfer ", "Settle",  };
  List<String> colnames = Arrays.asList(array);
  for (int i = 0; i < cols; i++) {
    if (colnames.contains(headers.get(i))) {
                colMap.put(headers.get(i), new Integer(i));
  // I need to iterate over this map to get key and values
  // The code below doesnt give me the key and values
     for (Iterator iter = colMap.iterator(); iter.hasNext();)
       Map.Entry entry = (Map.Entry)iter.next();
       String key = (String)entry.getKey();
       String value = (String)entry.getValue();
 

Answer 1

Maps provide methods called keySet(), values() and entrySet(). Each of those returns a Collection (Set/Collection/Set respectively) that represents a view on the Map. You can get those and get a iterator of that objects.
If you need both the key and the value in a loop, then you should use the entrySet method.