Add this method inside the concrete class:Its precondition is a valid receiver, including an empty one. Its postcondition leaves and prints the entries of from left to right in the displayed bracket format, followed by a newline. The loop invariant says that the printed entries are precisely the chain before
def display: Unit = {
print("[")
var current = first
var separator = ""
while (current != null) {
print(separator)
print(current.datum)
separator = ", "
current = current.next
}
println("]")
}current; the not-yet-printed entries are the chain starting there. Advancing along the acyclic chain terminates after its length. Printing changes the output stream, but it changes neither links nor payloads. Articles by others on the same topic
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