Remove Setting Method §

Problem §

The value of a field should be set only when it’s created, and not change at any time after that.

classDiagram
  class Customer{
    SetImmutableValue()
  }

Solution §

So remove methods that set the field’s value.

classDiagram
  class Customer

Why Refactor §

You want to prevent any changes to the value of a field.

How to Refactor §

1. The value of a field should be changeable only in the constructor. If the constructor doesn’t contain a parameter for setting the value, add one.

2. Find all setter calls.

   • If a setter call is located right after a call for the constructor of the current class, move its argument to the constructor call and remove the setter.

   • Replace setter calls in the constructor with direct access to the field.

3. Delete the setter.