Hello Guys help me..LinkedList code

Question

https://code.sololearn.com/crP73lVS4tH6/?ref=app..
here in line no 31 we used first=first.next ....due to which first becomes null and we can remove 1st value...is it p0ossible that in remove () function i do
just like
ptr=first;
ptr=ptr.next;
due to which i can make ptr as null and delete first value....
is this poasible or not...if it s not possible then why???

Answer 1

here in Java, variables ptr and first stores reference (address) to object of type Node, but it is not called pointer.

Answer 2

you can do this, but it is redundant

public void removeFront2() {
ptr=first; //first=x; ptr=x
ptr=ptr.next; //first=x; ptr=y
first=ptr; //first=y; ptr=y
}

Answer 3

zemiak here why u put first=ptr. ....

Answer 4

you need to store head object to variable first, not to ptr

Answer 5

here please clarify... i am really confused what is pointer and what is variable..can variable store address???

Answer 6

means (first) variable will only stores address oif Object