Difference between Bridge pattern and Adapter pattern

Question

What is the difference between the Bridge and Adapter patterns?

Answer 1

There are plenty of answers To distinguish between Adapter and Bridge. But as ppl are looking for code examples, I would give one example for Adapter Design Pattern crafted into a timeline story :

    //---------------------------------------External Vendor/Provider--------------------------------
   
            //Adaptee | RussianTankInterface is adaptee | adaptee lives in is own lala land and do not care about any other class or interface
            RussianTankInterface smerch9K58 = new RussianTank("The Russian Artillery bought by India in October 2015");
                smerch9K58.aboutMyself();
                smerch9K58.stuff();
                smerch9K58.rotate();
                smerch9K58.launch();
        
   
    //---------------------------------2016 : India manufactures Bharat52 ------------------------------ 
    
            //Client_1 :: IndianTank 
            EnemyAttacker bharat52Attacker = new IndianTank("Tank built in India delivered to Army in Jul 2016"); 
   
            // behaves normally -------------------------(1)
                bharat52Attacker.aboutMe();
                bharat52Attacker.load();
                bharat52Attacker.revolve();
                bharat52Attacker.fireArtillery();
                
    //---------------------------------2019 : India mnufactures Pinaka, and thought about fusion with Russian technology - so adaption required ------------------------------ 
                  
            //Client_2 :: IndianTank 
            EnemyAttacker pinakaAttacker = new IndianTank("Tank built in India in 1998 got upgraded_v1 in 9 Sep 2019"); 
            
            
            
#####----Bilateral-Coalition happens----## 
#####       India  : I want a fusion artillery technology with 
#####                       1) Indian materials and brain-power but
#####                       2) Russian machine-parts-movement technology 
#####       Russia : Give me your Interface - at max we can help by providing an Adapter 
    
    //---------------------------------------External Vendor/Provider-----------------------------------
    
            //Adapter :: RussianTechnologyAdapter | Russia gets EnemyAttacker interface only from India & creates RussianTechnologyAdapter 
            RussianTechnologyAdapter russianTechnologyAdapter = new RussianTechnologyAdapter(smerch9K58);
           
           
            //Target | EnemyAttacker was initially ClientInterface but later becomes the Target as story evolves | <- client owns this Interface
            EnemyAttacker dhanushAttacker = russianTechnologyAdapter;
            
#####----Russia keeps her Word----## 
#####       Russia to India : Here you go! Take Dhanush, a wrapper over our encapsulated adapter, and plug-in anything conforming to your EnemyAttacker.
#####       India : Thanks a lot!

    //--------------------------------- 2020 : India returns back happily with dhanushAttacker--------------------------------------- 
            
            //Client_2 - adapted behavior -------------------------(2)
                dhanushAttacker.setNavigationCapability(pinakaAttacker.getCuttingEdgeNavigableTargets());
                dhanushAttacker.aboutMe(); //calls RussianInstance -> aboutMyself()
                dhanushAttacker.load();    //calls RussianInstance -> stuff()
                dhanushAttacker.revolve(); //calls RussianInstance -> rotate()
                dhanushAttacker.fireArtillery();  //calls RussianInstance -> launch()
                       
          

Carefully notice :

• Same API in (1) & (2) behaves differently
• India can push its brain into wireFrame of Russia e.g dhanushAttacker.setNavigationCapability(pinakaAttacker.get(..))

Noteworthy points

Client side owns:

-  Invoker /Use(uses Adapter later point)/Client
-  ClientInterface (a.k.a Target )

Shared later:

- ClientInterface  ( becomes Target after sharing)

Receiver side owns :

- Adapter (later shared directly or as a wrapper )  
- Adaptee

     

Hoping someone gives an inline for Bridge too :)