Answer :
Mutator method Modification of private instance variables.
In computer science, the mutator method is a method used to control changes in a variable. They are also widely known as method setters. Often a setter is accompanied by a getter (also known as an accessor), which returns the value of a private member variable. While accessor methods have a return type and no parameters, mutator methods have no return type (they are void methods) and have parameters (the value the object will change to).
For mutators, method names must be property names with "=” appended. As long as an accessor matching a particular property name is defined on the enclosing type, this convention will enable the call site mutation syntax reflecting the assignment.
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