fix inconsistent java naming (#6624)

samples/client/petstore/java/feign/src/main/java/io/swagger/client/api/AnotherFakeApi.java

@@ -0,0 +1,30 @@
+package io.swagger.client.api;
+
+import io.swagger.client.ApiClient;
+import io.swagger.client.EncodingUtils;
+
+import io.swagger.client.model.Client;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import feign.*;
+
+
+public interface AnotherFakeApi extends ApiClient.Api {
+
+
+  /**
+   * To test special tags
+   * To test special tags
+    * @param body client model (required)
+   * @return Client
+   */
+  @RequestLine("PATCH /another-fake/dummy")
+  @Headers({
+    "Content-Type: application/json",
+    "Accept: application/json",
+  })
+  Client testSpecialTags(Client body);
+}

samples/client/petstore/java/feign/src/test/java/io/swagger/client/api/AnotherFakeApiTest.java

@@ -0,0 +1,40 @@
+package io.swagger.client.api;
+
+import io.swagger.client.ApiClient;
+import io.swagger.client.model.Client;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * API tests for AnotherFakeApi
+ */
+public class AnotherFakeApiTest {
+
+    private AnotherFakeApi api;
+
+    @Before
+    public void setup() {
+        api = new ApiClient().buildClient(AnotherFakeApi.class);
+    }
+
+    
+    /**
+     * To test special tags
+     *
+     * To test special tags
+     */
+    @Test
+    public void testSpecialTagsTest() {
+        Client body = null;
+        // Client response = api.testSpecialTags(body);
+
+        // TODO: test validations
+    }
+
+    
+}