Fixing String in echoedData, Adding Deep copy snippet and test

README.md

@@ -1938,6 +1938,36 @@ public class HttpPostSnippet {
   }
 }
 ```
+## Object
+
+### Deep Copy
+
+```java
+public class DeepCopySnippet {
+
+  /**
+   * Performs a deep copy of a Serializable object.
+   */
+  @SuppressWarnings("unchecked")
+  public static <T extends Serializable> T deepCopy(T obj) {
+    try {
+      ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+      ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
+      objectOutputStream.writeObject(obj);
+
+      ObjectInputStream objectInputStream = new ObjectInputStream(
+          new ByteArrayInputStream(byteArrayOutputStream.toByteArray()));
+
+      return (T) objectInputStream.readObject();
+
+    } catch (Exception e) {
+      throw new RuntimeException("Deep copy failed", e);
+    }
+  }
+}
+
+```
+
 
 ## String
 

build.gradle

@@ -37,7 +37,7 @@ sonarqube {
 repositories {
     // Use 'jcenter' for resolving your dependencies.
     // You can declare any Maven/Ivy/file repository here.
-    jcenter()
+    mavenCentral()
 }
 
 // In this section you declare the dependencies for your production and test code

src/main/java/object/DeepCopySnippet.java

@@ -0,0 +1,60 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package object;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/**
+ * This class provides a method to perform a deep copy of a Serializable object. It uses
+ * serialization and deserialization to create a new instance that is independent of the original
+ * object.
+ */
+
+public class DeepCopySnippet {
+
+  /**
+   * Performs a deep copy of a Serializable object.
+   */
+  @SuppressWarnings("unchecked")
+  public static <T extends Serializable> T deepCopy(T obj) {
+    try {
+      ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+      ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
+      objectOutputStream.writeObject(obj);
+
+      ObjectInputStream objectInputStream = new ObjectInputStream(
+          new ByteArrayInputStream(byteArrayOutputStream.toByteArray()));
+
+      return (T) objectInputStream.readObject();
+
+    } catch (Exception e) {
+      throw new RuntimeException("Deep copy failed", e);
+    }
+  }
+}

src/test/java/network/HttpPostSnippetTest.java

@@ -46,7 +46,7 @@ void testHttpPost() throws IOException, InterruptedException {
     var result = HttpPostSnippet.httpPost("https://postman-echo.com/post", arguments);
     //This postman endpoint echoes the HTTP headers, request parameters, the contents
     //of the request body and the complete URI requested.
-    var echoedData = "\"data\": \"Hello World\"";
+    var echoedData = "\"data\":\"Hello World\"";
     assertThat(result.body(), containsString(echoedData));
   }
 }

src/test/java/object/DeepCopySnippetTest.java

@@ -0,0 +1,63 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package object;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+
+import java.io.Serializable;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit test for {@link DeepCopySnippet}.
+ */
+public class DeepCopySnippetTest {
+
+  @Test
+  public void testDeepCopy() {
+    // SETUP
+    Owner alice = new Owner("Alice");
+    Animal animal = new Animal("Dog", alice);
+
+    // EXECUTE
+    Animal deepCopiedAnimal = DeepCopySnippet.deepCopy(animal);
+
+    // VERIFY
+    assertNotSame(animal, deepCopiedAnimal);
+    assertEquals(animal.name(), deepCopiedAnimal.name());
+    assertNotSame(animal.owner(), deepCopiedAnimal.owner());
+    assertEquals(animal.owner().name(), deepCopiedAnimal.owner().name());
+  }
+
+  /**
+   *  Owner record.
+   */
+  record Owner(String name) implements Serializable {}
+
+  /**
+   * Animal record.
+   */
+  record Animal(String name, Owner owner) implements Serializable {}
+}