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premaseempremaseem
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Chain of Responsibility design pattern - Money Dispenser Project
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‎pattern/src/com/premaseem/ATMmoneyDispenser/Client.java‎

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package com.premaseem.ATMmoneyDispenser;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import java.util.Scanner;
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public class Client {
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public static void main(String[] args) {
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System.out.println("Welcome to ATM Money dispenser program designed using Chain of Responsibility");
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Scanner scan = new Scanner(System.in);
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MoneyChainHandler thousandollarHandler_1000 = new ThousandollarHandler_1000(1000);
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MoneyChainHandler FiveHundredollarHandler_500 = new FiveHundredollarHandler_500(500);
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MoneyChainHandler HundrendollarHandler_100 = new HundrenDollarHandler_100(100);
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MoneyChainHandler FiftydollarHandler_50 = new FiftyDollarHandler_50(50);
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MoneyChainHandler TendollarHandler_10 = new TenDollarHandler_10(10);
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MoneyChainHandler FivedollarHandler_5 = new FiveDollarHandler_5(5);
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MoneyChainHandler TwodollarHandler_2 = new TwoDollarHandler_2(2);
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MoneyChainHandler OnedollarHandler_1 = new OneDollarHandler_1(1);
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// Setting up the change
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thousandollarHandler_1000.setNextHandler(FiveHundredollarHandler_500);
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FiveHundredollarHandler_500.setNextHandler(HundrendollarHandler_100);
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HundrendollarHandler_100.setNextHandler(FiftydollarHandler_50);
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FiftydollarHandler_50.setNextHandler(TendollarHandler_10);
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TendollarHandler_10.setNextHandler(FivedollarHandler_5);
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FivedollarHandler_5.setNextHandler(TwodollarHandler_2);
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TwodollarHandler_2.setNextHandler(OnedollarHandler_1);
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String repeatRunFlag = "y";
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while (!repeatRunFlag.equalsIgnoreCase("no")) {
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System.out.println("Please enter amount you want to withdraw eg 3450 ");
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int choice = scan.nextInt();
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thousandollarHandler_1000.handler(choice);
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System.out.println("=============================");
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System.out.println("Press No to Exit and any other character to repeat .... ");
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try {
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repeatRunFlag = scan.next();
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} catch (Exception e) {
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repeatRunFlag = "n";
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}
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}
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$ Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$$ www.premaseem.me $$$$$$$$$$$$$$$$$$$$$$ \n ");
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}
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}

‎pattern/src/com/premaseem/ATMmoneyDispenser/MoneyChainHandler.java‎

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package com.premaseem.ATMmoneyDispenser;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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public abstract class MoneyChainHandler {
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MoneyChainHandler nextHandler = null;
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Integer noteDenomination = 0;
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public MoneyChainHandler setNextHandler (MoneyChainHandler nextHandler) {
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this.nextHandler = nextHandler;
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return this.nextHandler;
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}
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public void handler (int dollarBill) {
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int notes = dollarBill / noteDenomination;
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int remainingAmount = dollarBill % noteDenomination;
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if (notes > 0) {
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System.out.printf("dispatched %d X %d = %d handled by %s \n", noteDenomination, notes, (noteDenomination * notes), this.getClass().getSimpleName());
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}
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if (nextHandler != null && remainingAmount > 0) {
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nextHandler.handler(remainingAmount);
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}
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}
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}
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class HundrenDollarHandler_100 extends MoneyChainHandler {
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public HundrenDollarHandler_100 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}
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class FiftyDollarHandler_50 extends MoneyChainHandler {
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public FiftyDollarHandler_50 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}
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class TenDollarHandler_10 extends MoneyChainHandler {
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public TenDollarHandler_10 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}
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class FiveDollarHandler_5 extends MoneyChainHandler {
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public FiveDollarHandler_5 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}
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class TwoDollarHandler_2 extends MoneyChainHandler {
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public TwoDollarHandler_2 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}
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class OneDollarHandler_1 extends MoneyChainHandler {
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public OneDollarHandler_1 (Integer noteDenomination) {
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this.noteDenomination = noteDenomination;
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}
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}

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