diff --git a/src/main/java/com/google/api/generator/engine/ast/JavaDocComment.java b/src/main/java/com/google/api/generator/engine/ast/JavaDocComment.java
index 733223df06..12300b862c 100644
--- a/src/main/java/com/google/api/generator/engine/ast/JavaDocComment.java
+++ b/src/main/java/com/google/api/generator/engine/ast/JavaDocComment.java
@@ -92,9 +92,7 @@ public Builder addSampleCode(String sampleCode) {
       Arrays.stream(sampleCode.split("\\r?\\n"))
           .forEach(
               line -> {
-                // TODO(summerji): Temporary solution to escape character @ in <pre>{@code...}
-                // markdown code block.
-                componentsList.add(line.replace("@Override", "{@literal @}Override"));
+                componentsList.add(line);
               });
       componentsList.add("}</pre>");
       return this;
diff --git a/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java
index fa6de000a1..9fe1ff6eca 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/ClientLibraryPackageInfoComposer.java
@@ -20,6 +20,8 @@
 import com.google.api.generator.engine.ast.JavaDocComment;
 import com.google.api.generator.engine.ast.PackageInfoDefinition;
 import com.google.api.generator.engine.ast.TypeNode;
+import com.google.api.generator.engine.ast.VaporReference;
+import com.google.api.generator.gapic.composer.samplecode.ServiceClientSampleCodeComposer;
 import com.google.api.generator.gapic.composer.utils.ClassNames;
 import com.google.api.generator.gapic.model.GapicContext;
 import com.google.api.generator.gapic.model.GapicPackageInfo;
@@ -111,7 +113,16 @@ private static CommentStatement createPackageInfoJavadoc(GapicContext context) {
       javaDocCommentBuilder =
           javaDocCommentBuilder.addParagraph(
               String.format(SAMPLE_CODE_HEADER_PATTERN, javaClientName));
-      // TODO(summerji): Add package-info.java sample code here.
+      TypeNode clientType =
+          TypeNode.withReference(
+              VaporReference.builder()
+                  .setPakkage(service.pakkage())
+                  .setName(ClassNames.getServiceClientClassName(service))
+                  .build());
+      String packageInfoSampleCode =
+          ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
+              service, clientType, context.resourceNames(), context.messages());
+      javaDocCommentBuilder.addSampleCode(packageInfoSampleCode);
     }
 
     return CommentStatement.withComment(javaDocCommentBuilder.build());
diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java
index 29a9c4db1e..45757f71bd 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java
@@ -129,7 +129,8 @@ public GapicClass generate(
 
     ClassDefinition classDef =
         ClassDefinition.builder()
-            .setHeaderCommentStatements(createClassHeaderComments(service, typeStore))
+            .setHeaderCommentStatements(
+                createClassHeaderComments(service, typeStore, resourceNames, messageTypes))
             .setPackageString(pakkage)
             .setAnnotations(createClassAnnotations(pakkage, typeStore))
             .setScope(ScopeNode.PUBLIC)
@@ -161,9 +162,15 @@ private static List<TypeNode> createClassImplements(TypeStore typeStore) {
   }
 
   private static List<CommentStatement> createClassHeaderComments(
-      Service service, TypeStore typeStore) {
+      Service service,
+      TypeStore typeStore,
+      Map<String, ResourceName> resourceNames,
+      Map<String, Message> messageTypes) {
     TypeNode clientType = typeStore.get(ClassNames.getServiceClientClassName(service));
     TypeNode settingsType = typeStore.get(ClassNames.getServiceSettingsClassName(service));
+    String classMethodSampleCode =
+        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
+            service, clientType, resourceNames, messageTypes);
     String credentialsSampleCode =
         ServiceClientSampleCodeComposer.composeClassHeaderCredentialsSampleCode(
             clientType, settingsType);
@@ -171,7 +178,7 @@ private static List<CommentStatement> createClassHeaderComments(
         ServiceClientSampleCodeComposer.composeClassHeaderEndpointSampleCode(
             clientType, settingsType);
     return ServiceClientCommentComposer.createClassHeaderComments(
-        service, credentialsSampleCode, endpointSampleCode);
+        service, classMethodSampleCode, credentialsSampleCode, endpointSampleCode);
   }
 
   private static List<MethodDefinition> createClassMethods(
diff --git a/src/main/java/com/google/api/generator/gapic/composer/comment/ServiceClientCommentComposer.java b/src/main/java/com/google/api/generator/gapic/composer/comment/ServiceClientCommentComposer.java
index 7275ef7627..004082568a 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/comment/ServiceClientCommentComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/comment/ServiceClientCommentComposer.java
@@ -110,7 +110,10 @@ public class ServiceClientCommentComposer {
               + " operation returned by another API method call.");
 
   public static List<CommentStatement> createClassHeaderComments(
-      Service service, String credentialsSampleCode, String endpointSampleCode) {
+      Service service,
+      String classMethodSampleCode,
+      String credentialsSampleCode,
+      String endpointSampleCode) {
     JavaDocComment.Builder classHeaderJavadocBuilder = JavaDocComment.builder();
     if (service.hasDescription()) {
       classHeaderJavadocBuilder =
@@ -122,7 +125,7 @@ public static List<CommentStatement> createClassHeaderComments(
 
     // Service introduction.
     classHeaderJavadocBuilder.addParagraph(SERVICE_DESCRIPTION_INTRO_STRING);
-    // TODO(summerji): Add sample code here.
+    classHeaderJavadocBuilder.addSampleCode(classMethodSampleCode);
 
     // API surface description.
     classHeaderJavadocBuilder.addParagraph(
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java
index 8f8f59d5e6..07abeb9a17 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/SampleCodeWriter.java
@@ -30,6 +30,8 @@ public static String write(List<Statement> statements) {
     for (Statement statement : statements) {
       statement.accept(visitor);
     }
-    return SampleCodeJavaFormatter.format(visitor.write());
+    String formattedSampleCode = SampleCodeJavaFormatter.format(visitor.write());
+    // Escape character "@" in the markdown code block <pre>{@code...} tags.
+    return formattedSampleCode.replaceAll("@", "{@literal @}");
   }
 }
diff --git a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java
index a3adb6486a..1951beb93b 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposer.java
@@ -44,6 +44,7 @@
 import com.google.api.generator.gapic.model.Method.Stream;
 import com.google.api.generator.gapic.model.MethodArgument;
 import com.google.api.generator.gapic.model.ResourceName;
+import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.utils.JavaStyle;
 import com.google.common.base.Preconditions;
 import java.util.ArrayList;
@@ -56,8 +57,31 @@
 
 public class ServiceClientSampleCodeComposer {
 
+  public static String composeClassHeaderMethodSampleCode(
+      Service service,
+      TypeNode clientType,
+      Map<String, ResourceName> resourceNames,
+      Map<String, Message> messageTypes) {
+    // Use the first pure unary RPC method's sample code as showcase, if no such method exists, use
+    // the first method in the service's methods list.
+    Method method =
+        service.methods().stream()
+            .filter(m -> m.stream() == Stream.NONE && !m.hasLro() && !m.isPaged())
+            .findFirst()
+            .orElse(service.methods().get(0));
+    if (method.stream() == Stream.NONE) {
+      if (method.methodSignatures().isEmpty()) {
+        return composeRpcDefaultMethodHeaderSampleCode(
+            method, clientType, resourceNames, messageTypes);
+      }
+      return composeRpcMethodHeaderSampleCode(
+          method, clientType, method.methodSignatures().get(0), resourceNames, messageTypes);
+    }
+    return composeStreamCallableMethodHeaderSampleCode(
+        method, clientType, resourceNames, messageTypes);
+  }
+
   public static String composeClassHeaderCredentialsSampleCode(
-      // TODO(summerji): Add unit tests for composeClassHeaderCredentialsSampleCode.
       TypeNode clientType, TypeNode settingsType) {
     // Initialize clientSettings with builder() method.
     // e.g. EchoSettings echoSettings =
@@ -130,7 +154,6 @@ public static String composeClassHeaderCredentialsSampleCode(
   }
 
   public static String composeClassHeaderEndpointSampleCode(
-      // TODO(summerji): Add unit tests for composeClassHeaderEndpointSampleCode.
       TypeNode clientType, TypeNode settingsType) {
     // Initialize client settings with builder() method.
     // e.g. EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint("myEndpoint").build();
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
index 9d9e299fa1..caf5f4108e 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
@@ -34,6 +34,12 @@ import javax.annotation.Generated;
  * This class provides the ability to make remote calls to the backing service through method calls
  * that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (EchoClient echoClient = EchoClient.create()) {
+ *   EchoResponse response = echoClient.echo();
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the EchoClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
index e68742165d..ea5a23008b 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
@@ -24,6 +24,15 @@ import javax.annotation.Generated;
  * This class provides the ability to make remote calls to the backing service through method calls
  * that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (IdentityClient identityClient = IdentityClient.create()) {
+ *   String parent = UserName.of("[USER]").toString();
+ *   String displayName = "displayName1714148973";
+ *   String email = "email96619420";
+ *   User response = identityClient.createUser(parent, displayName, email);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the IdentityClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java
index 85bba288e8..0b42cae251 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/samplecode/ServiceClientSampleCodeComposerTest.java
@@ -30,14 +30,19 @@
 import com.google.api.generator.gapic.model.MethodArgument;
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.ResourceReference;
+import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
 import com.google.api.generator.testutils.LineFormatter;
 import com.google.protobuf.Descriptors.FileDescriptor;
+import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
 import org.junit.Test;
 
 public class ServiceClientSampleCodeComposerTest {
@@ -45,6 +50,268 @@ public class ServiceClientSampleCodeComposerTest {
   private static final String LRO_PACKAGE_NAME = "com.google.longrunning";
   private static final String PROTO_PACKAGE_NAME = "com.google.protobuf";
 
+  // =============================== Class Header Sample Code ===============================//
+  @Test
+  public void composeClassHeaderMethodSampleCode_unaryRpc() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map<String, ResourceName> resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    ServiceDescriptor echoService = echoFileDescriptor.getServices().get(0);
+    Set<ResourceName> outputResourceNames = new HashSet<>();
+    List<Service> services =
+        Parser.parseService(
+            echoFileDescriptor, messageTypes, resourceNames, Optional.empty(), outputResourceNames);
+    Service echoProtoService = services.get(0);
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results = ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(echoProtoService, clientType, resourceNames, messageTypes);
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoResponse response = echoClient.echo();\n",
+            "}");
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeClassHeaderMethodSampleCode_firstMethodIsNotUnaryRpc() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map<String, ResourceName> resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Operation").setPakkage(LRO_PACKAGE_NAME).build());
+    TypeNode responseType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode metadataType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("WaitMetadata")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    LongrunningOperation lro = LongrunningOperation.withTypes(responseType, metadataType);
+    TypeNode ttlTypeNode =
+        TypeNode.withReference(
+            VaporReference.builder().setName("Duration").setPakkage(PROTO_PACKAGE_NAME).build());
+    MethodArgument ttl =
+        MethodArgument.builder()
+            .setName("ttl")
+            .setType(ttlTypeNode)
+            .setField(
+                Field.builder()
+                    .setName("ttl")
+                    .setType(ttlTypeNode)
+                    .setIsMessage(true)
+                    .setIsContainedInOneof(true)
+                    .build())
+            .build();
+    Method method =
+        Method.builder()
+            .setName("Wait")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setLro(lro)
+            .setMethodSignatures(Arrays.asList(Arrays.asList(ttl)))
+            .build();
+    Service service = Service.builder()
+        .setName("Echo")
+        .setDefaultHost("localhost:7469")
+        .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+        .setPakkage(SHOWCASE_PACKAGE_NAME)
+        .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+        .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+        .setOverriddenName("Echo")
+        .setMethods(Arrays.asList(method))
+        .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
+            service, clientType, resourceNames, messageTypes);
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  Duration ttl = Duration.newBuilder().build();\n",
+            "  WaitResponse response = echoClient.waitAsync(ttl).get();\n",
+            "}");
+    assertEquals(results, expected);
+  }
+
+  @Test
+  public void composeClassHeaderMethodSampleCode_firstMethodHasNoSignatures() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map<String, ResourceName> resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder().setName("EchoResponse").setPakkage(SHOWCASE_PACKAGE_NAME).build());
+    Method method =
+        Method.builder()
+            .setName("Echo")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setMethodSignatures(Collections.emptyList())
+            .build();
+    Service service = Service.builder()
+        .setName("Echo")
+        .setDefaultHost("localhost:7469")
+        .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+        .setPakkage(SHOWCASE_PACKAGE_NAME)
+        .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+        .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+        .setOverriddenName("Echo")
+        .setMethods(Arrays.asList(method))
+        .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
+            service, clientType, resourceNames, messageTypes);
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  EchoRequest request =\n",
+            "      EchoRequest.newBuilder()\n",
+            "          .setName(FoobarName.ofProjectFoobarName(\"[PROJECT]\", \"[FOOBAR]\").toString())\n",
+            "          .setParent(FoobarName.ofProjectFoobarName(\"[PROJECT]\", \"[FOOBAR]\").toString())\n",
+            "          .setFoobar(Foobar.newBuilder().build())\n",
+            "          .build();\n",
+            "  EchoResponse response = echoClient.echo(request);\n",
+            "}");
+    assertEquals(results, expected);
+  }
+
+  @Test
+  public void composeClassHeaderMethodSampleCode_firstMethodIsStream() {
+    FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
+    Map<String, ResourceName> resourceNames = Parser.parseResourceNames(echoFileDescriptor);
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    TypeNode inputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("ExpandRequest")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode outputType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoResponse")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    Method method =
+        Method.builder()
+            .setName("Expand")
+            .setInputType(inputType)
+            .setOutputType(outputType)
+            .setStream(Stream.SERVER)
+            .build();
+    Service service = Service.builder()
+        .setName("Echo")
+        .setDefaultHost("localhost:7469")
+        .setOauthScopes(Arrays.asList("https://www.googleapis.com/auth/cloud-platform"))
+        .setPakkage(SHOWCASE_PACKAGE_NAME)
+        .setProtoPakkage(SHOWCASE_PACKAGE_NAME)
+        .setOriginalJavaPackage(SHOWCASE_PACKAGE_NAME)
+        .setOverriddenName("Echo")
+        .setMethods(Arrays.asList(method))
+        .build();
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results = ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(service, clientType, resourceNames, messageTypes);
+    String expected =
+        LineFormatter.lines(
+            "try (EchoClient echoClient = EchoClient.create()) {\n",
+            "  ExpandRequest request =\n",
+            "      ExpandRequest.newBuilder().setContent(\"content951530617\").setInfo(\"info3237038\").build();\n",
+            "  ServerStream<EchoResponse> stream = echoClient.expandCallable().call(request);\n",
+            "  for (EchoResponse response : stream) {\n",
+            "    // Do something when a response is received.\n",
+            "  }\n",
+            "}");
+    assertEquals(results, expected);
+  }
+
+  @Test
+  public void composeClassHeaderCredentialsSampleCode() {
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode settingsType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoSettings")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        ServiceClientSampleCodeComposer.composeClassHeaderCredentialsSampleCode(clientType, settingsType);
+    String expected =
+        LineFormatter.lines(
+            "EchoSettings echoSettings =\n",
+            "    EchoSettings.newBuilder()\n",
+            "        .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))\n",
+            "        .build();\n",
+            "EchoClient echoClient = EchoClient.create(echoSettings);");
+    assertEquals(expected, results);
+  }
+
+  @Test
+  public void composeClassHeaderEndpointSampleCode() {
+    TypeNode clientType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoClient")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    TypeNode settingsType =
+        TypeNode.withReference(
+            VaporReference.builder()
+                .setName("EchoSettings")
+                .setPakkage(SHOWCASE_PACKAGE_NAME)
+                .build());
+    String results =
+        ServiceClientSampleCodeComposer.composeClassHeaderEndpointSampleCode(clientType, settingsType);
+    String expected =
+        LineFormatter.lines(
+            "EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint(myEndpoint).build();\n",
+            "EchoClient echoClient = EchoClient.create(echoSettings);");
+    assertEquals(expected, results);
+  }
+
   // =======================================Unary RPC Method Sample Code=======================//
   @Test
   public void validComposeRpcMethodHeaderSampleCode_pureUnaryRpc() {
@@ -1894,17 +2161,17 @@ public void validComposeStreamCallableMethodHeaderSampleCode_clientStream() {
             "try (EchoClient echoClient = EchoClient.create()) {\n",
             "  ApiStreamObserver<EchoRequest> responseObserver =\n",
             "      new ApiStreamObserver<EchoRequest>() {\n",
-            "        @Override\n",
+            "        {@literal @}Override\n",
             "        public void onNext(EchoResponse response) {\n",
             "          // Do something when a response is received.\n",
             "        }\n",
             "\n",
-            "        @Override\n",
+            "        {@literal @}Override\n",
             "        public void onError(Throwable t) {\n",
             "          // Add error-handling\n",
             "        }\n",
             "\n",
-            "        @Override\n",
+            "        {@literal @}Override\n",
             "        public void onCompleted() {\n",
             "          // Do something when complete.\n",
             "        }\n",
diff --git a/test/integration/goldens/asset/AssetServiceClient.java b/test/integration/goldens/asset/AssetServiceClient.java
index 66f9f6589e..b838391926 100644
--- a/test/integration/goldens/asset/AssetServiceClient.java
+++ b/test/integration/goldens/asset/AssetServiceClient.java
@@ -46,6 +46,18 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
+ *   BatchGetAssetsHistoryRequest request =
+ *       BatchGetAssetsHistoryRequest.newBuilder()
+ *           .setParent(FeedName.ofProjectFeedName("[PROJECT]", "[FEED]").toString())
+ *           .addAllAssetNames(new ArrayList<String>())
+ *           .setReadTimeWindow(TimeWindow.newBuilder().build())
+ *           .build();
+ *   BatchGetAssetsHistoryResponse response = assetServiceClient.batchGetAssetsHistory(request);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the AssetServiceClient object to clean up resources such
  * as threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/asset/package-info.java b/test/integration/goldens/asset/package-info.java
index e57f641808..1d38c8e91e 100644
--- a/test/integration/goldens/asset/package-info.java
+++ b/test/integration/goldens/asset/package-info.java
@@ -22,6 +22,18 @@
  * <p>Service Description: Asset service definition.
  *
  * <p>Sample for AssetServiceClient:
+ *
+ * <pre>{@code
+ * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
+ *   BatchGetAssetsHistoryRequest request =
+ *       BatchGetAssetsHistoryRequest.newBuilder()
+ *           .setParent(ProjectName.of("[PROJECT]").toString())
+ *           .addAllAssetNames(new ArrayList<String>())
+ *           .setReadTimeWindow(TimeWindow.newBuilder().build())
+ *           .build();
+ *   BatchGetAssetsHistoryResponse response = assetServiceClient.batchGetAssetsHistory(request);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.asset.v1;
diff --git a/test/integration/goldens/credentials/IamCredentialsClient.java b/test/integration/goldens/credentials/IamCredentialsClient.java
index 6dd22974d7..dd6d14576c 100644
--- a/test/integration/goldens/credentials/IamCredentialsClient.java
+++ b/test/integration/goldens/credentials/IamCredentialsClient.java
@@ -42,6 +42,17 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
+ *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
+ *   List<String> delegates = new ArrayList<>();
+ *   List<String> scope = new ArrayList<>();
+ *   Duration lifetime = Duration.newBuilder().build();
+ *   GenerateAccessTokenResponse response =
+ *       iamCredentialsClient.generateAccessToken(name, delegates, scope, lifetime);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the IamCredentialsClient object to clean up resources such
  * as threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/credentials/package-info.java b/test/integration/goldens/credentials/package-info.java
index dd29f50059..44fccd4d71 100644
--- a/test/integration/goldens/credentials/package-info.java
+++ b/test/integration/goldens/credentials/package-info.java
@@ -29,6 +29,17 @@
  * self-signed JSON Web Tokens (JWTs), and more.
  *
  * <p>Sample for IamCredentialsClient:
+ *
+ * <pre>{@code
+ * try (IamCredentialsClient iamCredentialsClient = IamCredentialsClient.create()) {
+ *   ServiceAccountName name = ServiceAccountName.of("[PROJECT]", "[SERVICE_ACCOUNT]");
+ *   List<String> delegates = new ArrayList<>();
+ *   List<String> scope = new ArrayList<>();
+ *   Duration lifetime = Duration.newBuilder().build();
+ *   GenerateAccessTokenResponse response =
+ *       iamCredentialsClient.generateAccessToken(name, delegates, scope, lifetime);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.iam.credentials.v1;
diff --git a/test/integration/goldens/library/LibraryServiceClient.java b/test/integration/goldens/library/LibraryServiceClient.java
index 8cb759bc3a..71f65f763b 100644
--- a/test/integration/goldens/library/LibraryServiceClient.java
+++ b/test/integration/goldens/library/LibraryServiceClient.java
@@ -66,6 +66,13 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
+ *   Shelf shelf = Shelf.newBuilder().build();
+ *   Shelf response = libraryServiceClient.createShelf(shelf);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the LibraryServiceClient object to clean up resources such
  * as threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/library/package-info.java b/test/integration/goldens/library/package-info.java
index 17a7499dac..708b4eb1d1 100644
--- a/test/integration/goldens/library/package-info.java
+++ b/test/integration/goldens/library/package-info.java
@@ -29,6 +29,13 @@
  * `shelves/&#42;/books/&#42;`
  *
  * <p>Sample for LibraryServiceClient:
+ *
+ * <pre>{@code
+ * try (LibraryServiceClient libraryServiceClient = LibraryServiceClient.create()) {
+ *   Shelf shelf = Shelf.newBuilder().build();
+ *   Shelf response = libraryServiceClient.createShelf(shelf);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.example.library.v1;
diff --git a/test/integration/goldens/logging/ConfigClient.java b/test/integration/goldens/logging/ConfigClient.java
index 5e50999446..d36cf98868 100644
--- a/test/integration/goldens/logging/ConfigClient.java
+++ b/test/integration/goldens/logging/ConfigClient.java
@@ -75,6 +75,18 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (ConfigClient configClient = ConfigClient.create()) {
+ *   GetBucketRequest request =
+ *       GetBucketRequest.newBuilder()
+ *           .setName(
+ *               LogBucketName.ofProjectLocationBucketName("[PROJECT]", "[LOCATION]", "[BUCKET]")
+ *                   .toString())
+ *           .build();
+ *   LogBucket response = configClient.getBucket(request);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the ConfigClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/logging/LoggingClient.java b/test/integration/goldens/logging/LoggingClient.java
index c4941027e1..777f7cec46 100644
--- a/test/integration/goldens/logging/LoggingClient.java
+++ b/test/integration/goldens/logging/LoggingClient.java
@@ -60,6 +60,13 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (LoggingClient loggingClient = LoggingClient.create()) {
+ *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+ *   loggingClient.deleteLog(logName);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the LoggingClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/logging/MetricsClient.java b/test/integration/goldens/logging/MetricsClient.java
index 15bb6d7de2..75f52ead30 100644
--- a/test/integration/goldens/logging/MetricsClient.java
+++ b/test/integration/goldens/logging/MetricsClient.java
@@ -51,6 +51,13 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (MetricsClient metricsClient = MetricsClient.create()) {
+ *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
+ *   LogMetric response = metricsClient.getLogMetric(metricName);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the MetricsClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/logging/package-info.java b/test/integration/goldens/logging/package-info.java
index e9e35d3456..33fd7ef3d9 100644
--- a/test/integration/goldens/logging/package-info.java
+++ b/test/integration/goldens/logging/package-info.java
@@ -23,17 +23,43 @@
  *
  * <p>Sample for LoggingClient:
  *
+ * <pre>{@code
+ * try (LoggingClient loggingClient = LoggingClient.create()) {
+ *   LogName logName = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+ *   loggingClient.deleteLog(logName);
+ * }
+ * }</pre>
+ *
  * <p>======================= ConfigClient =======================
  *
  * <p>Service Description: Service for configuring sinks used to route log entries.
  *
  * <p>Sample for ConfigClient:
  *
+ * <pre>{@code
+ * try (ConfigClient configClient = ConfigClient.create()) {
+ *   GetBucketRequest request =
+ *       GetBucketRequest.newBuilder()
+ *           .setName(
+ *               LogBucketName.ofProjectLocationBucketName("[PROJECT]", "[LOCATION]", "[BUCKET]")
+ *                   .toString())
+ *           .build();
+ *   LogBucket response = configClient.getBucket(request);
+ * }
+ * }</pre>
+ *
  * <p>======================= MetricsClient =======================
  *
  * <p>Service Description: Service for configuring logs-based metrics.
  *
  * <p>Sample for MetricsClient:
+ *
+ * <pre>{@code
+ * try (MetricsClient metricsClient = MetricsClient.create()) {
+ *   LogMetricName metricName = LogMetricName.of("[PROJECT]", "[METRIC]");
+ *   LogMetric response = metricsClient.getLogMetric(metricName);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.logging.v2;
diff --git a/test/integration/goldens/redis/CloudRedisClient.java b/test/integration/goldens/redis/CloudRedisClient.java
index aa220493f0..7b1a0e27f6 100644
--- a/test/integration/goldens/redis/CloudRedisClient.java
+++ b/test/integration/goldens/redis/CloudRedisClient.java
@@ -67,6 +67,13 @@
  * <p>This class provides the ability to make remote calls to the backing service through method
  * calls that map to API methods. Sample code to get started:
  *
+ * <pre>{@code
+ * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
+ *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+ *   Instance response = cloudRedisClient.getInstance(name);
+ * }
+ * }</pre>
+ *
  * <p>Note: close() needs to be called on the CloudRedisClient object to clean up resources such as
  * threads. In the example above, try-with-resources is used, which automatically calls close().
  *
diff --git a/test/integration/goldens/redis/package-info.java b/test/integration/goldens/redis/package-info.java
index 34ceb21ccf..9aa6d67fa9 100644
--- a/test/integration/goldens/redis/package-info.java
+++ b/test/integration/goldens/redis/package-info.java
@@ -41,6 +41,13 @@
  * </ul>
  *
  * <p>Sample for CloudRedisClient:
+ *
+ * <pre>{@code
+ * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
+ *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+ *   Instance response = cloudRedisClient.getInstance(name);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.redis.v1beta1;