Question

I have a hashmap having four values a,b,c,d and list having only a i want to see if the hashmap has the value a and print it.

hashmap.get('data') results a,b,c,d

list l is having a

how will i print only the value a

Answer 1

A Map stores Key-Value pairs. It offers a values() method to get a collection of all values from the map.

So basically you have to take your own list, get the values from the hashmap and check for every item in the list if it is a map value:

public static Collection<String> contains(Map<String, String> map, List<String> list) {

   Collection<String> values = map.values();
   Set<String> result = new HashSet<String>();
   for (String listItem:list) {
     if (values.contains(listItem) {
       result.add(listItem);
     }
   }
   return result;  // contains a collection of all list items that are values of the map
}