Class initialization and instantiation

initialization ： Execute only once when the class is loaded , Static will be executed at this time , Create a storage space to store static data .

Instantiation ： It refers to the process of creating an object . This process will open up memory in the heap , Put some non static methods , Variables are stored inside . In the process of program execution , You can create multiple objects , Both multiple instantiation . Each instantiation will open up a new piece of memory .