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What is the adapter design pattern in Java?

What is the adapter design pattern in Java?

An Adapter pattern acts as a connector between two incompatible interfaces that otherwise cannot be connected directly. An Adapter wraps an existing class with a new interface so that it becomes compatible with the client’s interface.

What is adapter pattern with example?

This pattern involves a single class which is responsible to join functionalities of independent or incompatible interfaces. A real life example could be a case of card reader which acts as an adapter between memory card and a laptop.

How does the adapter pattern work?

The adapter pattern convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces. The client sees only the target interface and not the adapter. The adapter implements the target interface.

What is an Adaptor Java?

Adapter is a structural design pattern, which allows incompatible objects to collaborate. The Adapter acts as a wrapper between two objects. It catches calls for one object and transforms them to format and interface recognizable by the second object.

Why do we use adapter design pattern?

The adapter pattern is often used to make existing classes work with others without modifying their source code. Adapter patterns use a single class (the adapter class) to join functionalities of independent or incompatible interfaces/classes.

When should we use Adapter pattern?

When To Use It?

  1. When we are working with two incompatible systems or class or interface, the adapter pattern can be very powerful to use.
  2. Whenever we have several objects or methods doing something but have different implementations or different syntaxes, an adapter pattern can be definitely a good option!

When should we use adapter pattern?

Why do we need adapter pattern?

What is the difference between adapter and bridge pattern?

A Bridge pattern can only be implemented before the application is designed. Allows an abstraction and implementation to change independently whereas an Adapter pattern makes it possible for incompatible classes to work together.

What are the two variations of adapter pattern?

If you do some research on the adapter pattern, you will find two different versions of it: The class adapter pattern that implements the adapter using inheritance. The object adapter pattern that uses composition to reference an instance of the wrapped class within the adapter.

Where we can use adapter design pattern?

You can use the Adapter design pattern when you have to deal with different interfaces with similar behavior (which usually means classes with similar behavior but with different methods). An example of it would be a class to connect to a Samsung TV and another one to connect to a Sony TV.

How to implement adapter design pattern in Java?

The adapter design pattern is a structural design pattern that allows two unrelated/uncommon interfaces to work together.

  • Interfaces may be incompatible,but the inner functionality should match the requirement.
  • The adapter pattern is often used to make existing classes work with others without modifying their source code.
  • How to create a builder design pattern in Java?

    The parameters to the constructor are reduced and are provided in highly readable method calls.

  • Builder design pattern also helps in minimizing the number of parameters in constructor and thus there is no need to pass in null for optional parameters to the constructor.
  • Object is always instantiated in a complete state
  • How to design a performant adapter?

    Design how each element in the list is going to look and behave. Based on this design, extend the ViewHolder class. Your version of ViewHolder provides all the functionality for your list items. Your view holder is a wrapper around a View, and that view is managed by RecyclerView. Define the Adapter that associates your data with the ViewHolder views.

    How to create singleton design pattern in Java?

    Make constructor private.

  • Make a private constant static instance (class-member) of this Singleton class.
  • Write a static/factory method that returns the object of the singleton class that we have created as a class-member instance.
  • We can also mark a static member as public to access constant static instance directly.