Editing Adapter pattern (section)

===Implementation of the adapter pattern===
When implementing the adapter pattern, for clarity, one can apply the class name {{Java|[ClassName]To[Interface]Adapter}} to the provider implementation; for example, {{Java|DAOToProviderAdapter}}. It should have a constructor method with an adaptee class variable as a parameter. This parameter will be passed to an instance member of {{Java|[ClassName]To[Interface]Adapter}}. When the clientMethod is called, it will have access to the adaptee instance that allows for accessing the required data of the adaptee and performing operations on that data that generates the desired output.

====Java====
<syntaxhighlight lang=Java>
interface ILightningPhone {
    void recharge();
    void useLightning();
}

interface IMicroUsbPhone {
    void recharge();
    void useMicroUsb();
}

class Iphone implements ILightningPhone {
    private boolean connector;

    @Override
    public void useLightning() {
        connector = true;
        System.out.println("Lightning connected");
    }

    @Override
    public void recharge() {
        if (connector) {
            System.out.println("Recharge started");
            System.out.println("Recharge finished");
        } else {
            System.out.println("Connect Lightning first");
        }
    }
}

class Android implements IMicroUsbPhone {
    private boolean connector;

    @Override
    public void useMicroUsb() {
        connector = true;
        System.out.println("MicroUsb connected");
    }

    @Override
    public void recharge() {
        if (connector) {
            System.out.println("Recharge started");
            System.out.println("Recharge finished");
        } else {
            System.out.println("Connect MicroUsb first");
        }
    }
}
/* exposing the target interface while wrapping source object */
class LightningToMicroUsbAdapter implements IMicroUsbPhone {
    private final ILightningPhone lightningPhone;

    public LightningToMicroUsbAdapter(ILightningPhone lightningPhone) {
        this.lightningPhone = lightningPhone;
    }

    @Override
    public void useMicroUsb() {
        System.out.println("MicroUsb connected");
        lightningPhone.useLightning();
    }

    @Override
    public void recharge() {
        lightningPhone.recharge();
    }
}

public class AdapterDemo {
    static void rechargeMicroUsbPhone(IMicroUsbPhone phone) {
        phone.useMicroUsb();
        phone.recharge();
    }

    static void rechargeLightningPhone(ILightningPhone phone) {
        phone.useLightning();
        phone.recharge();
    }

    public static void main(String[] args) {
        Android android = new Android();
        Iphone iPhone = new Iphone();

        System.out.println("Recharging android with MicroUsb");
        rechargeMicroUsbPhone(android);

        System.out.println("Recharging iPhone with Lightning");
        rechargeLightningPhone(iPhone);

        System.out.println("Recharging iPhone with MicroUsb");
        rechargeMicroUsbPhone(new LightningToMicroUsbAdapter (iPhone));
    }
}
</syntaxhighlight>

Output
<pre>
Recharging android with MicroUsb
MicroUsb connected
Recharge started
Recharge finished
Recharging iPhone with Lightning
Lightning connected
Recharge started
Recharge finished
Recharging iPhone with MicroUsb
MicroUsb connected
Lightning connected
Recharge started
Recharge finished
</pre>

====Python====
<syntaxhighlight lang="python">
"""
Adapter pattern example.
"""
from abc import ABCMeta, abstractmethod

NOT_IMPLEMENTED = "You should implement this."

RECHARGE = ["Recharge started.", "Recharge finished."]

POWER_ADAPTERS = {"Android": "MicroUSB", "iPhone": "Lightning"}

CONNECTED = "{} connected."
CONNECT_FIRST = "Connect {} first."

class RechargeTemplate(metaclass=ABCMeta):

    @abstractmethod
    def recharge(self):
        raise NotImplementedError(NOT_IMPLEMENTED)

class FormatIPhone(RechargeTemplate):
    @abstractmethod
    def use_lightning(self):
        raise NotImplementedError(NOT_IMPLEMENTED)

class FormatAndroid(RechargeTemplate):
    @abstractmethod
    def use_micro_usb(self):
        raise NotImplementedError(NOT_IMPLEMENTED)

class IPhone(FormatIPhone):
    __name__ = "iPhone"

    def __init__(self):
        self.connector = False

    def use_lightning(self):
        self.connector = True
        print(CONNECTED.format(POWER_ADAPTERS[self.__name__]))

    def recharge(self):
        if self.connector:
            for state in RECHARGE:
                print(state)
        else:
            print(CONNECT_FIRST.format(POWER_ADAPTERS[self.__name__]))

class Android(FormatAndroid):
    __name__ = "Android"

    def __init__(self):
        self.connector = False

    def use_micro_usb(self):
        self.connector = True
        print(CONNECTED.format(POWER_ADAPTERS[self.__name__]))

    def recharge(self):
        if self.connector:
            for state in RECHARGE:
                print(state)
        else:
            print(CONNECT_FIRST.format(POWER_ADAPTERS[self.__name__]))

class IPhoneAdapter(FormatAndroid):
    def __init__(self, mobile):
        self.mobile = mobile

    def recharge(self):
        self.mobile.recharge()

    def use_micro_usb(self):
        print(CONNECTED.format(POWER_ADAPTERS["Android"]))
        self.mobile.use_lightning()

class AndroidRecharger:
    def __init__(self):
        self.phone = Android()
        self.phone.use_micro_usb()
        self.phone.recharge()

class IPhoneMicroUSBRecharger:
    def __init__(self):
        self.phone = IPhone()
        self.phone_adapter = IPhoneAdapter(self.phone)
        self.phone_adapter.use_micro_usb()
        self.phone_adapter.recharge()

class IPhoneRecharger:
    def __init__(self):
        self.phone = IPhone()
        self.phone.use_lightning()
        self.phone.recharge()

print("Recharging Android with MicroUSB recharger.")
AndroidRecharger()
print()

print("Recharging iPhone with MicroUSB using adapter pattern.")
IPhoneMicroUSBRecharger()
print()

print("Recharging iPhone with iPhone recharger.")
IPhoneRecharger()
</syntaxhighlight>

==== C# ====
<syntaxhighlight lang="c#">
public interface ILightningPhone
{
	void ConnectLightning();
	void Recharge();
}

public interface IUsbPhone
{
	void ConnectUsb();
	void Recharge();
}

public sealed class AndroidPhone : IUsbPhone
{
	private bool isConnected;

	public void ConnectUsb()
	{
		this.isConnected = true;
		Console.WriteLine("Android phone connected.");
	}

	public void Recharge()
	{
		if (this.isConnected)
		{
			Console.WriteLine("Android phone recharging.");
		}
		else
		{
			Console.WriteLine("Connect the USB cable first.");
		}
	}
}

public sealed class ApplePhone : ILightningPhone
{
	private bool isConnected;

	public void ConnectLightning()
	{
		this.isConnected = true;
		Console.WriteLine("Apple phone connected.");
	}

	public void Recharge()
	{
		if (this.isConnected)
		{
			Console.WriteLine("Apple phone recharging.");
		}
		else
		{
			Console.WriteLine("Connect the Lightning cable first.");
		}
	}
}

public sealed class LightningToUsbAdapter : IUsbPhone
{
	private readonly ILightningPhone lightningPhone;

	private bool isConnected;

	public LightningToUsbAdapter(ILightningPhone lightningPhone)
	{
		this.lightningPhone = lightningPhone;
	}

	public void ConnectUsb()
	{
		this.lightningPhone.ConnectLightning();
	}

	public void Recharge()
	{
		this.lightningPhone.Recharge();
	}
}

public void Main()
{
	ILightningPhone applePhone = new ApplePhone();
	IUsbPhone adapterCable = new LightningToUsbAdapter(applePhone);
	adapterCable.ConnectUsb();
	adapterCable.Recharge();
}
</syntaxhighlight>Output:<syntaxhighlight lang="output">
Apple phone connected.
Apple phone recharging.
</syntaxhighlight>