im very new to programming. I try to learn from Code Gym. But I still don’t understand some things. For example why is it crucial to put StackTraceElement[]… in last method on the chain in order for it to print all the methods that were used in that “chain”. Why can’t I start use this code in the main method like in second block of code. Sorry if it sounds stupid I just don’t get it.

when creating a stack, one data type is created, but it is not possible to create more than one type for the same stack. Can this problem be solved?? I am looking for a scientific journal to solve this problem , can someone help with this problem
when creating a stack, one data type is created, but it is not possible to create more than one type for the same stack. Can this problem be solved?? I am looking for a scientific journal to solve this problem , can someone help with this problem