dependency injection

package payment;

interface PaymentProvider{
	public void pay();
}

class Balea implements PaymentProvider{

	@Override
	public void pay() {
		// TODO Auto-generated method stub
		System.out.println("Pay baela");
	}
	
}

class CreditCard implements PaymentProvider{

	@Override
	public void pay() {
		// TODO Auto-generated method stub
		System.out.println("Pay CreditCard");
	}
	
}
class Order {
	private PaymentProvider obj;
	
	public Order(PaymentProvider obj) {
		this.obj = obj;
	}
	public void create() {
	   this.obj.pay();
	}
}

class PaymentProviderFactory {
	public PaymentProvider getProvider(String country) throws Exception {
		switch (country) {
		case "EG":
			return new Balea();
		case "AU":
			return new CreditCard();
		}
		
		throw new Exception("hello");
	}
}

public class main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		PaymentProviderFactory factory = new PaymentProviderFactory();
		
		PaymentProvider bb = null;
		try {
			bb = factory.getProvider("AU");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		};
		Order orderObj = new Order(bb);
		PaymentProvider cc = new CreditCard();
//		Order orderObjCC = new Order(cc);
//		orderObj.create();
		orderObj.create();
	}

}