design pattern to decouple abstraction from implementation?

We can use Bridge design pattern to detach the implementation from the abstraction.

Bridge is mainly used for separation of concern in design. We can create an implementation and store it in the interface, which is an abstraction. Where as specific implementation of other features can be done in concrete classes that implement the interface.

Often Bridge design pattern is implemented by using Adapter pattern.

E.g. we have Shape interface. We want to make Square and Circle shapes. But further we want to make RedSquare, BlackSquare shapes and GreenCircle, WhiteCircle shapes. In this case rather than creating one hierarchy of all the shapes, we separate the Color concern from Shape hierarchy.

So we create two hierarchies. One is Shape to Square and Shape to Circle hierarchy. Another one is Color to Red, Black, Green, White hierarchy. In this way we can create multiple types of shapes with multiple colors with Bridge design pattern.