Create a Array from HashMap in Java

Create a Array from HashMap in Java

I want to create a Array of String from a Hashmap In java?
My HashMap is like this
HashMap<String, String> param = new HashMap<String, String>();
param.put("A", "2");
param.put("B", "3");
param.put("C", "2");
I want to create a Array of String like this .
String[] list = {"A 1", "A 2","B 1","B 2","B 3","C 1","C 2"};
I am new In Java .Please help to how could i do this .Thanks