update java petstore sample

samples/client/petstore/java/retrofit/src/main/java/io/swagger/client/api/FakeApi.java

@@ -6,6 +6,7 @@ import retrofit.Callback;
 import retrofit.http.*;
 import retrofit.mime.*;
 
+import io.swagger.client.model.Client;
 import org.joda.time.LocalDate;
 import org.joda.time.DateTime;
 import java.math.BigDecimal;
@@ -16,6 +17,31 @@ import java.util.List;
 import java.util.Map;
 
 public interface FakeApi {
+  /**
+   * To test \"client\" model
+   * Sync method
+   * 
+   * @param body client model (required)
+   * @return Client
+   */
+  
+  @PATCH("/fake")
+  Client testClientModel(
+    @Body Client body
+  );
+
+  /**
+   * To test \"client\" model
+   * Async method
+   * @param body client model (required)
+   * @param cb callback method
+   * @return void
+   */
+  
+  @PATCH("/fake")
+  void testClientModel(
+    @Body Client body, Callback<Client> cb
+  );
   /**
    * Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
    * Sync method

samples/client/petstore/java/retrofit/src/main/java/io/swagger/client/model/Client.java

@@ -0,0 +1,99 @@
+/**
+ * Swagger Petstore
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * OpenAPI spec version: 1.0.0
+ * Contact: apiteam@swagger.io
+ *
+ * NOTE: This class is auto generated by the swagger code generator program.
+ * https://github.com/swagger-api/swagger-codegen.git
+ * Do not edit the class manually.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package io.swagger.client.model;
+
+import java.util.Objects;
+import com.google.gson.annotations.SerializedName;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+
+
+/**
+ * Client
+ */
+
+public class Client   {
+  @SerializedName("client")
+  private String client = null;
+
+  public Client client(String client) {
+    this.client = client;
+    return this;
+  }
+
+   /**
+   * Get client
+   * @return client
+  **/
+  @ApiModelProperty(example = "null", value = "")
+  public String getClient() {
+    return client;
+  }
+
+  public void setClient(String client) {
+    this.client = client;
+  }
+
+
+  @Override
+  public boolean equals(java.lang.Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Client client = (Client) o;
+    return Objects.equals(this.client, client.client);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(client);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Client {\n");
+    
+    sb.append("    client: ").append(toIndentedString(client)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(java.lang.Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
+