Question: If non-mutator methods in a class needs to change the value of one of the class's instance variables they should always use the instance variable's

If non-mutator methods in a class needs to change the value of one of the class's instance variables they should always use the instance variable's mutator Why?

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If non-mutator methods in a class needs to change the value of one of the class's instance variables they should always use the instance variable's mutator Why?

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