Understanding Mutator Methods in Programming

The video tutorial explains how changing a phone case is similar to changing an attribute of an object in programming. It introduces mutator methods, which are used to change the value of an instance variable. The tutorial guides viewers through writing a mutator method for a cell phone class, focusing on the method signature, return type, and parameter. It then demonstrates how to implement and use the method to change the case color of a cell phone object, emphasizing the flexibility mutator methods provide in altering object states without creating new objects.

What is the main reason for changing a phone case according to the video?

• To upgrade the phone model

• To change an attribute of the phone

• To improve phone performance

• To increase phone storage

What is a mutator method primarily used for?

• To create new objects

• To change the value of an instance variable

• To print object details

• To delete instance variables

What is the first word in the method signature of a mutator method?

• Static

• Protected

• Private

• Public

What should the return type be for a mutator method that only performs an action?

• int

• String

• void

• boolean

What is the typical naming convention for mutator methods?

• getVariableName

• setVariableName

• changeVariableName

• updateVariableName

What data type should the parameter of the setCaseColor method be?

• boolean

• double

• String

• int

What is the purpose of the parameter in the setCaseColor method?

• To store the old value

• To create a new instance variable

• To specify the new value for the instance variable

• To delete the instance variable

How do you change the case color of a cell phone object in the tester class?

• By creating a new object

• By using the setCaseColor method

• By deleting the old case

• By calling a print method

What happens when you run the code with myCellPhone.setCaseColor('green')?

• The phone model changes

• The phone's battery life improves

• The phone's case color changes to green

• The phone's storage increases

Why don't we need to create a new object every time an attribute changes?

• Because new objects are expensive to create

• Because attributes never change

• Because mutator methods allow us to change the state of an object

• Because objects are immutable