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this video presents a stack implementation whose underlying implementation is a chain of linked nodes later in the video Java code will be provided but the basic principles behind this implementation apply to other languages as well as long as they support either reference types or pointers the link stack is made up of several nodes a node is a simple data structure consisting of two variables data and a reference to a next node now this is drawn in simple form here where we simply assume the first box as the data in the second box is the link to the following node note that sometimes that next link will be null in which case we put a slash through that box the stack always maintains a reference to its top node now if the stack is empty then this one variable will simply have a slash through it because it will be a null reference if we are then to push a value onto it we will create a new node and put that value into the data portion and have the null reference be the next link of tha