Java: How to implement duplicate key for a HashMap?

Question

Example
Map data = new HashMap();
data.put("a","America");
data.put("a","Africa");
data.put("b","Bangladesh");

Need to have both "America" and "Africa" as value against key "a". Is there any mechanism to achieve this scenario.

Answer 1

use

Map<String,List> data = new HashMap();

{a:[America,Africa] ,b:[Bangaldesh]}