Introduction to OOP

Chapter 23: Object Interconnections :

Subclass Coupling

Subclass coupling describes the relationship between a parent class and a child class.

Ideally the parent has no strong connection to the child, so the connection is one way. Can understand the parent in isolation from the child.

class Parent {
	...
}

class Child extends Parent {
	...
}

A very weak form of coupling. Which makes it a good design choice.