feat(hw-03): implement Proxy pattern

hw-03/project-root/app/src/main/java/org/example/App.java

@@ -7,6 +7,7 @@ import org.example.adapter.*;
 import org.example.builder.*;
 import org.example.chain.*;
 import org.example.decorator.*;
+import org.example.proxy.*;
 
 public class App {
   public static void main(String[] args) {
@@ -18,6 +19,7 @@ public class App {
     checkBuilderPattern();
     checkChainPattern();
     checkDecoratorPattern();
+    checkProxyPattern();
   }
 
   private static void checkAdapterPattern() {
@@ -48,4 +50,11 @@ public class App {
 
     decorator.operation();
   }
+
+  private static void checkProxyPattern() {
+    Service service = new ConcreteService();
+    Service proxy = new ServiceProxy(service);
+
+    proxy.execute();
+  }
 }

hw-03/project-root/app/src/main/java/org/example/proxy/ConcreteService.java

@@ -0,0 +1,10 @@
+package org.example.proxy;
+
+/** Concrete Service */
+public class ConcreteService implements Service {
+
+  @Override
+  public void execute() {
+    System.out.println("ConcreteService выполняет операцию");
+  }
+}

hw-03/project-root/app/src/main/java/org/example/proxy/Service.java

@@ -0,0 +1,6 @@
+package org.example.proxy;
+
+/** Service */
+public interface Service {
+  void execute();
+}

hw-03/project-root/app/src/main/java/org/example/proxy/ServiceProxy.java

@@ -0,0 +1,17 @@
+package org.example.proxy;
+
+/** Service Proxy */
+public class ServiceProxy implements Service {
+
+  public ServiceProxy(Service service) {
+    this.service = service;
+  }
+
+  @Override
+  public void execute() {
+    System.out.println("ServiceProxy разрешает выполнение операции");
+    service.execute();
+  }
+
+  private final Service service;
+}