storing hashMap in a hashMap

Question

i am reading data from a text file and want to store HashMap in another HashMap..

HashMap<string,HashMap<string,value>> 

how to store data and retrieve it? any sample code will be appreciated... thank u

Answer 1

Example:

Creating and populating the maps

Map<String, Map<String, Value>> outerMap = new HashMap<String, HashMap<String, Value>>(); Map<String, Value> innerMap = new HashMap<String, Value>();     innerMap.put("innerKey", new Value()); 

Storing a map

outerMap.put("key", innerMap); 

Retrieving a map and its values

Map<String, Value> map = outerMap.get("key"); Value value = map.get("innerKey"); 

Answer 2

Creating two Simple Hashmaps: InnerMap and OuterMap

    HashMap<String, HashMap<String, String>> outerMap = new HashMap<String, HashMap<String,String>>();     HashMap<String, String> innerMap = new HashMap<String, String>(); 

Populating the HashMaps

    innerMap.put("InnerKey", "InnerValue");     outerMap.put("OuterKey", innerMap); 

Retreiving values from HashMaps

    String value = ((HashMap<String, String>)outerMap.get("OuterKey")).get("InnerKey").toString();     System.out.println("Retreived value is : " + value);