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The code for a class Ball has been started below.

The following links give specifications of three further methods that you should add to the code already given.

$($a$)$ equals: publicboolean equals$($object obj$).$

Overrides: equals in class object

Parameters: obj$-$ object to compare with this object for equality

Returns: true if obj is a ball$($or subclass of$)$ whose diameter and x position are the same as this object, otherwise return false

$($b$)$ compareTo: public int compareTo $($ ball bb$)$

Specified by: compareTo in interface comparable

Parameters: bb$-$ a ball object to compare with this object

Returns: an integer greater than o if this ball has a greater diameter than the given ball, o if this ball has the same diameter as the given ball, an integer less than o if this ball has a smaller diameter than the given ball

$($c$)$ hashCode: public int hashcode$()$

Overrides: hashCode in class object

Returns: an integer hash of the diameter and xPosition in that order using the objects.hash

Make any other alterations to the sa$11$ class required to implement the above methods.

Answer: $($penalty regime: $0\%)$

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