AOP1

src/main/java/org/springframework/samples/petclinic/proxy/Cash.java

@@ -0,0 +1,11 @@
+package org.springframework.samples.petclinic.proxy;
+
+public class Cash implements Payment {
+
+	@Override
+	public void pay(int amount) {
+		System.out.println(amount + "현금 결재" );
+
+	}
+}
+

src/main/java/org/springframework/samples/petclinic/proxy/CreditCard.java

@@ -0,0 +1,14 @@
+package org.springframework.samples.petclinic.proxy;
+
+public class CreditCard implements Payment {
+	Payment cash = new Cash();
+
+	@Override
+	public void pay(int amount) {
+		if (amount > 100) {
+			System.out.println(amount + " 신용 카드");
+		} else {
+			cash.pay(amount);
+		}
+	}
+}

src/main/java/org/springframework/samples/petclinic/proxy/Payment.java

@@ -0,0 +1,6 @@
+package org.springframework.samples.petclinic.proxy;
+
+public interface Payment {
+
+	void pay(int amount);
+}

src/main/java/org/springframework/samples/petclinic/proxy/Store.java

@@ -0,0 +1,14 @@
+package org.springframework.samples.petclinic.proxy;
+
+public class Store {
+
+	Payment payment;
+
+	public Store(Payment payment) {
+		this.payment = payment;
+	}
+
+	public void buySomething() {
+		payment.pay(100);
+	}
+}