[JAVA-14174] Renamed paterns to paterns-module (#12718)

* [JAVA-14174] Renamed paterns to paterns-module

* [JAVA-14174] naming fixes

Co-authored-by: panagiotiskakos <panagiotis.kakos@libra-is.com>

patterns-modules/design-patterns-structural/src/main/java/com/baeldung/proxy/ExpensiveObject.java

@@ -0,0 +1,5 @@
+package com.baeldung.proxy;
+
+public interface ExpensiveObject {
+    void process();
+}

patterns-modules/design-patterns-structural/src/main/java/com/baeldung/proxy/ExpensiveObjectImpl.java

@@ -0,0 +1,20 @@
+package com.baeldung.proxy;
+
+import static com.baeldung.util.LoggerUtil.LOG;
+
+public class ExpensiveObjectImpl implements ExpensiveObject {
+
+    public ExpensiveObjectImpl() {
+        heavyInitialConfiguration();
+    }
+
+    @Override
+    public void process() {
+        LOG.info("processing complete.");
+    }
+
+    private void heavyInitialConfiguration() {
+        LOG.info("Loading initial configuration..");
+    }
+
+}

patterns-modules/design-patterns-structural/src/main/java/com/baeldung/proxy/ExpensiveObjectProxy.java

@@ -0,0 +1,13 @@
+package com.baeldung.proxy;
+
+public class ExpensiveObjectProxy implements ExpensiveObject{
+    private static ExpensiveObject object;
+
+    @Override
+    public void process() {
+        if(object == null) {
+            object = new ExpensiveObjectImpl();
+        }
+        object.process();
+    }
+}

patterns-modules/design-patterns-structural/src/main/java/com/baeldung/proxy/ProxyPatternDriver.java

@@ -0,0 +1,9 @@
+package com.baeldung.proxy;
+
+public class ProxyPatternDriver {
+    public static void main(String[] args) {
+        ExpensiveObject object = new ExpensiveObjectProxy();
+        object.process();
+        object.process();
+    }
+}