Question

Class Test is my separate class which has two field of String and Float type, I am using this class with List Collections which will be finally populated as values into HashMap.

But when I try to populate the Map with a key and the List objects (values) into the map, Java does not seem to accept it as it is not valid syntax:

ArrayList <Test> list = new ArrayList <Test> ();

Map<Integer, ArrayList <Test>> mp = new HashMap<Integer, ArrayList <Test>>();  

list.add(new Telephone ( 0.9 , "A"));
list.add(new Telephone(5.1 , "A"));

mp.put(0,list.get(0)); // this Does Not work :(, it should work

Output:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
The method put(Integer, ArrayList<Telephone>) in the type  
   Map<Integer,ArrayList<Telephone>> is not applicable for the arguments 
   (int,   Telephone) at Main.main(Main.java:64)

Answer 1

Going by your requirement you told in comments and question above I think you need following syntax for Map declaration:

Map<Integer,Test> mp = new HashMap<Integer,Test>();

EDIT

OK here is the Edit:

ArrayList<Test> list = new ArrayList<Test>();
Map<Integer,ArrayList<Test>> mp = new HashMap<Integer,ArrayList<Test>>();
list.add(new Test(0.1,"A"));
list.add(new Test(0.2,"B"));
mp.put(1,list);

and if you again want to put more Test objects at key 1 then do as follows:

List<Test> value = mp.get(1);
value.add(0.3,"c");
value.add(0.5,"E");

mp.put(1,value);