$/**$

Initialize an empty sequence with an initial capacity of INITIAL$\_$CAPACITY.

The append method works

efficiently $($without needing more memory$)$ until this capacity is reached.

@param $-$ none

@postcondition

This sequence is empty and has an initial capacity of INITIAL$\_$CAPACITY

@exception OutOfMemoryError

Indicates insufficient memory for initial array.

$**!$

public BallSeq$()$

$\{$

$//$ NB: NEVER assert the invariant at the START of the constructor.

$//($Why not? Think about it$.)$

$//$ TODO: Implement this code.

assert wellFormed$()$ : "Invariant false at end of constructor";

$\}$

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