$/**$

Accessor method to determine whether this sequence has a specified

current element $($a Ball or nu$1$l$)$ that can be retrieved with the

getCurrent method. This depends on the status of the cursor.

Eparam $-$ none

greturn

true $($there is a current element$)$ or false $($there is no current element at the moment$)$

$**/$

public boolean isCurrent$(()$

$\{$

assert wellFormed$()$ : "invariant failed at start of isCurrent";

$//$ TODO: Implement this code.

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