Pull Up Field

Goal

A field declared identically in two or more subclasses moves to the shared superclass.

Before the refactoring

class Manager  extends Employee { _name; }
class Engineer extends Employee { _name; }

After the refactoring

class Employee { _name; }
class Manager  extends Employee {}
class Engineer extends Employee {}

Savings

One source of truth for the field's type and default; subclasses focus on what they actually specialize.

Note

Pulling up a field that subclasses use differently (different default, different visibility) creates surprise — verify the field semantics are identical.