arrays - How to achive dynamic binding with ArrayList<T> in Java? -

it looks arraylist in java not support dynamic binding. when tried following code gave compile time error.
code:

class value {     <some variables>     <some methods> }  class integervalue extends value { int value; }  class charactervalue extends value { char value;    }  class main{  arraylist<value> values = null; public static void main(string args[]) {     swtich(args[1])     {         case "integer":         values = new arraylist<integervalue>();         break;          case "character":         values = new arraylist<charactervalue>();         break;          default:         values = new arraylist<value>();      } } } 

looks arraylist not support dynamic binding array does. when did value[] values = new integervalue[maxsize], did compiled creating references of superclass type. if dont know size @ beginning , want dynamic behaviour data structure (something arraylist can do) ? there other way achieve ? there other data structures ?

in advance.