I am having below ArrayList and wanted to split and create sublists and keep those in hashmap.Can anyone help.

public class SomeClass{

private String appNo;
private String status;
private String userName;

}

ArrayList:

 [

  {
   "appNo":"123",
   "status":"done",
   "userName":"abc"
  },

  {
   "appNo":"123",
   "status":"pending",
   "userName":"aaa"
 },
 {
   "appNo":"234",
   "status":"pending",
   "userName":"aaa"
 }

 ]

now i need to create sublist and entries against the appNo.

and i am expecting the output like below(with HashMap)

 HashMap map = new HashMap<String,List<SomeClass>>();

and here string is the appNo and corresponding same appNo entries needs to keep it the list.

    map key : 123
        value : list of 2 entries having the 123 appNo
    map key : 234
        value : list of 1 entry having the 234 appNO