CODEWITHSUNDEEP
javacollectionsdictionarystruts2arraylist
arvin_codeHunk
arvin_codeHunk

Reputation: 2390

Retrieve values based on keys from map inside maps

I working on a project where I have to connect the specific database based on the bank_name.I am using java,struts2,hibernate. for example:

{'sbi': 
   {'host':'111.111.15.45','port':3306,'username':'xxxx','password':'xxxx','database':'sbidb'}

Here sbi is a bank_name which is a key,then as a value there is another map. so I want to retrieve all values such as host,port,db based on bank_name(ex: 'sbi'). How to achieve this?

Upvotes: 1

Views: 3637

Answers (3)

Alpesh Gediya
Alpesh Gediya

Reputation: 3794

You can use following data structure to achieve this

Map<String, Map<String,String> bankdetails =  new HashMap<String, Map<String,String> ();

to put details of sbi,

first populate sbi specific details

HashMap<String, String> details =  new HashMap<String,String>();

   details.put("host","XXXX);

   details.put("port", "101111");

  ......

then use to put details of sbi as below

bankdetails.put(sbi ,details);

Upvotes: 0

Masood_mj
Masood_mj

Reputation: 1184

You should have a Map<String,Map<String,String>>. To get the keys for the interior map use the keySet() function of the map. Ex:

Map<String,Map<String,String>> X;
Set<String> sbikeys = X.get('sbi').keySet();

Upvotes: 0

Yogendra Singh
Yogendra Singh

Reputation: 34367

This is simple.

You Map is something like this:

 Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();
 .....

Now you can retrieve the key value pair from inner map as below:

  Map<String,String> sbiMap = map.get("sbi");
  Set<String> keys = sbiMap.keySet();
  for(String key: keys){
    System.out.println("key="+key+" value = " + sbiMap.get(key));
  }

This will print all inner keys and corresponding values in the map for sbi.

Upvotes: 1

Related Questions