Data: lv_value1 type ref to cl_bsp_messages()

Question

i have a small doubt, I am confusing a lot
1)Data: lv_value1 type ref to cl_bsp_messages
In this case what should i call lv_value1 is instance/reference/object ?
2) In do_finish_input() we have Global_messages import parameter which refers cl_bsp_messages as well
In this case what should i call Global_messages is instance/reference/object ?
3)In do_validate_input i wrote some of following code for my requirement
data: lv_value2 type ref to cl_bsp_wd_message_service
lv_value2 =  me->view_manager->get_message_service()
the rv_result  of get_message_service is  cl_bsp_wd_message_service
my question is  ,
In this case what should i call lv_value2 is instance/reference/object ?
4) data: lv_value3 type ref to CL_CRM_BOL_DQUERY_SERVICE.
lv_value3 = CL_CRM_BOL_DQUERY_SERVICE=>get_instance()
In this case what should i call lv_value3 is instance/reference/object ?

Answer 1

hi ,
1) Data: lv_value1 type ref to cl_bsp_messages
up to here you create an instance for this class cl_bsl_meassage
when you write create object then memory is allocated for this instance then it is called object.
for example if you have class to add two values , and we create two objects name as obj1 and obj2
so there we can multiple input vales at a time means using objec1 you can pass input values as 1 1 and result 2
using obj2 you can pass another 2 input values as 2 2 then result is 4,  how it will be done
when create an object it allocates separate memory for that object . using data statement you can just assign this object replies to this class.
2.In do_finish_outpu() the returing parameter type ref to cl_bsp_messages so that , using that attribute you can access all the methods and attributes of that class.
3 ) it is an object it holds the returning values of that methods , if you want get data from this object , you have some methods in that class
4 ) here also it is an object , using that method we are getting total instance of that class in to object lv_value3.