Behavioral Design Pattern - Chain of Responsibility Pattern

com/javadevjournal/design/behavioral/cor/ATMDispenser.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+import java.util.Scanner;
+/**
+ * @author Kunwar Vikas
+ */
+public class ATMDispenser {
+	private DispenseChain dispenseChain1;
+	public ATMDispenser() {
+		// initialize the chain
+		this.dispenseChain1 = new Dollar50Dispenser();
+		DispenseChain dispenseChain2 = new Dollar20Dispenser();
+		DispenseChain dispenseChain3 = new Dollar10Dispenser();
+
+		// set the chain of responsibility
+		dispenseChain1.setNextChain(dispenseChain2);
+		dispenseChain2.setNextChain(dispenseChain3);
+	}
+
+	public static void main(String[] args) {
+		ATMDispenser atmDispenser = new ATMDispenser();
+			int amount = 0;
+			System.out.print("Enter amount to dispense: ");
+			Scanner input = new Scanner(System.in);
+			amount = input.nextInt();
+			if (amount % 10 != 0) {
+				System.out.println("Amount should be in multiple of 10s.");
+				return;
+			}
+			// process the request
+			atmDispenser.dispenseChain1.dispense(new Currency(amount));
+	}
+}

com/javadevjournal/design/behavioral/cor/Currency.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+
+/**
+ * @author Kunwar Vikas
+ */
+public class Currency {
+	private int amount;
+
+	public Currency(int amount){
+		this.amount=amount;
+	}
+	public int getAmount(){
+		return this.amount;
+	}
+}

com/javadevjournal/design/behavioral/cor/DispenseChain.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+
+/**
+ * @author Kunwar Vikas
+ */
+public interface DispenseChain {
+	void setNextChain(DispenseChain nextChain);
+	void dispense(Currency currency);
+}

com/javadevjournal/design/behavioral/cor/Dollar10Dispenser.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+
+/**
+ * @author Kunwar Vikas
+ */
+public class Dollar10Dispenser implements DispenseChain {
+	private DispenseChain dispenseChain;
+	
+	@Override
+	public void setNextChain(DispenseChain nextChain) {
+		this.dispenseChain =nextChain;
+	}
+
+	@Override
+	public void dispense(Currency currency) {
+		if(currency.getAmount() >= 10){
+			int num = currency.getAmount()/10;
+			int remainder = currency.getAmount() % 10;
+			System.out.println("Dispensing "+num+" 10$ note");
+			if(remainder !=0) this.dispenseChain.dispense(new Currency(remainder));
+		}else{
+			this.dispenseChain.dispense(currency);
+		}
+	}
+
+}

com/javadevjournal/design/behavioral/cor/Dollar20Dispenser.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+
+/**
+ * @author Kunwar Vikas
+ */
+public class Dollar20Dispenser implements DispenseChain {
+	private DispenseChain dispenseChain;
+
+	@Override
+	public void setNextChain(DispenseChain nextChain) {
+		this.dispenseChain = nextChain;
+	}
+	@Override
+	public void dispense(Currency currency) {
+		if (currency.getAmount() >= 20) {
+			int num = currency.getAmount() / 20;
+			int remainder = currency.getAmount() % 20;
+			System.out.println("Dispensing " + num + " 20$ note");
+			if (remainder != 0) this.dispenseChain.dispense(new Currency(remainder));
+		} else {
+			this.dispenseChain.dispense(currency);
+		}
+	}
+}
+

com/javadevjournal/design/behavioral/cor/Dollar50Dispenser.java

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+package main.com.kunwar.designpatterns.behavioral.cor;
+
+/**
+ * @author Kunwar Vikas
+ */
+public class Dollar50Dispenser implements DispenseChain {
+	private DispenseChain dispenseChain;
+	
+	@Override
+	public void setNextChain(DispenseChain nextChain) {
+		this.dispenseChain =nextChain;
+	}
+	@Override
+	public void dispense(Currency currency) {
+		if(currency.getAmount() >= 50){
+			int num = currency.getAmount()/50;
+			int remainder = currency.getAmount() % 50;
+			System.out.println("Dispensing "+num+" 50$ note");
+			if(remainder !=0) this.dispenseChain.dispense(new Currency(remainder));
+		}else{
+			this.dispenseChain.dispense(currency);
+		}
+	}
+}