sahoosunilkumar

import 'package:flutter/material.dart';

const NormalText = TextStyle(fontSize: 16.0, color: Colors.black);
const TitleText =
    TextStyle(fontSize: 28.0, color: Colors.black, fontWeight: FontWeight.bold);

sahoosunilkumar

final class Party {

	private final String place;
	private final String name;
	private final String starter;
	private final String maincourse;
	private final String desert;
	private final String danceType;

	private Party(PartyBuilder builder) {

sahoosunilkumar

public class MakePayment {
	public static void main(String args[]) {

		IPayment payment = PaymentFactoryMethod.createPayment(PaymentType.PAYTM);
		payment.pay();

		payment = PaymentFactoryMethod.createPayment(PaymentType.GOOGLEPAY);
		payment.pay();

		payment = PaymentFactoryMethod.createPayment(PaymentType.PAYPAL);

sahoosunilkumar

public class PaymentFactoryMethod {

	public static IPayment createPayment(PaymentType type) {
		IPayment payment = null;

		switch (type) {
		case PAYTM:
			payment = new PaytmPayment();
			break;
		case GOOGLEPAY:

sahoosunilkumar

interface IPayment {
	void pay();
}

abstract class Payment implements IPayment {
	public Payment() {
		initialize();
	}

	protected abstract void initialize();

sahoosunilkumar

class PaytmPayment {
	public PaytmPayment() {
		initializePaytm();
	}
	private void initializePaytm() {
		// setup with paytm server
		System.out.println("paytm server initialized");
	}

	public void payUsingPaytm() {

sahoosunilkumar

public class Payment {
	public Payment() {
		initializePaytm();
		initializeGooglePay();
		initializePaypal();
	}

	private void initializePaytm() {
		// setup with paytm server
		System.out.println("paytm server initialized");

sahoosunilkumar

public class MakePayment {
	public static void main(String args[]) {
		//Pay using paytm
		Payment payment = new Payment();
		payment.pay();
	}
}

sahoosunilkumar

public class Payment {
	public Payment() {
		initializePaytm();
	}

	private void initializePaytm() {
		// setup with paytm server
		System.out.println("paytm server initialized");
	}