A parameter to a mutator method with the same name as the instance variable being changed hides the instance variable.

Name: A parameter to a mutator method with the same name as the instance variable being changed hides the instance variable.
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In Java, if a parameter has the same name as an instance variable, the parameter will hide the instance variable within the method's scope. To refer to the instance variable, the 'this' keyword is used.

A Parameter to a Mutator Method with the Same Name