How does the insertmethod enforce the precondition of getNodeAt?
What will be an ideal response?
getNodeAt’s precondition is (position >= 1) && (position <= itemCount). Before insert invokes getNodeAt, the boolean expression (newPosition >= 1) && (newPosition <= itemCount + 1) must be true. The call getNodeAt(newPosition - 1)occurs only if newPosition> 1 and sets its parameter,position, to newPosition – 1. Therefore, position >= 1 is true. Further, since newPosition <= itemCount + 1, newPosition – 1 <= itemCount, which implies that position <= itemCount.
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