Adapter Design Pattern
By: Klementinus Kennyvito Salim
What is Adapter?
• Adapter design pattern is basically similar to a hardware adapter , except
now it is for a program class.
• It converts the interface of a class into another interface that the client class
can accept and work together with
Adapter Diagram
Geeksforgeeks.com
Sample Code
interface Cat
{
public void walk();
public void meow();
}
class Persian implements Cat
{
public void walk()
{
System.out.println("Walking");
}
public void meow()
{
System.out.println("Meow
Meow");
}
}
interface Cat_Toy
{
// target interface
// Just a toy not walking
public void makeSound();
}
class Calling_Cat implements Cat_toy
{
public void makeSound()
{
System.out.println("Squeak");
}
}
Sample Code
class Adapter implements Cat_Toy
{
// You need to implement the
interface your
// client expects to use.
Cat cat;
public Adapter(Cat cat)
{
// reference to object we adapted
this.cat = cat;
}
public void makeSound()
{
// translate the methods
appropriately
cat.meow();
}
}
class Main
{
public static void main(String args[])
{
Persian persian = new Persian();
Cat_Toy toy = new Cat_Toy();
// Calling the adapter class to make the interface
compatible
Cat_Toy Adapter = new Adapter(persian);
System.out.println("Cat_toy...");
toyDuck.makeSound();
System.out.println("Adapter...");
Adapter.makeSound();
}
}
The Advantages and Disadvantages of using
Adapter Design Pattern
Advantages
•
Achieve flexibility and reusability of classes
and functions
Disadvantages
•
Sometimes many adaptations are required
among many adapters so that a certain type is
reached
Thank You