add client for server; do some refactoring

pom.xml

@@ -111,6 +111,14 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>11</source>
+          <target>11</target>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

src/main/java/com/gmgauthier/client/CalculatorClient.java

@@ -0,0 +1,68 @@
+package com.gmgauthier.client;
+
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+public class CalculatorClient {
+
+    private static final String ROOT_URL = "http://localhost:8000/";
+    static URI targetURI;
+    static HttpClient httpClient;
+
+    public static void main(String[] args)
+            throws URISyntaxException, IOException, InterruptedException {
+        httpClient = HttpClient.newHttpClient();
+
+        System.out.println(getSum(10,20));
+        System.out.println(getProduct(123, 444));
+        System.out.println(getDifference(846, 233));
+        System.out.println(getQuotient(999, 4));
+
+    }
+
+    public static Integer getSum(Integer operanda, Integer operandb)
+            throws URISyntaxException, IOException, InterruptedException {
+        URI addUrl = new URI(ROOT_URL + "sum");
+        JSONObject postJson = new JSONObject().put("values", new Integer[] {operanda, operandb});
+        return (Integer) new JSONObject(makeRequest(addUrl, postJson).body()).get("sum");
+    }
+
+    public static Integer getDifference(Integer operanda, Integer operandb)
+            throws URISyntaxException, IOException, InterruptedException {
+        URI addUrl = new URI(ROOT_URL + "difference");
+        JSONObject postJson = new JSONObject().put("values", new Integer[] {operanda, operandb});
+        return (Integer) new JSONObject(makeRequest(addUrl, postJson).body()).get("difference");
+    }
+
+    public static Integer getProduct(Integer operanda, Integer operandb)
+            throws URISyntaxException, IOException, InterruptedException {
+        URI addUrl = new URI(ROOT_URL + "product");
+        JSONObject postJson = new JSONObject().put("values", new Integer[] {operanda, operandb});
+        return (Integer) new JSONObject(makeRequest(addUrl, postJson).body()).get("product");
+    }
+
+    public static BigDecimal getQuotient(Integer operanda, Integer operandb)
+            throws URISyntaxException, IOException, InterruptedException {
+        URI addUrl = new URI(ROOT_URL + "quotient");
+        JSONObject postJson = new JSONObject().put("values", new Integer[] {operanda, operandb});
+        return (BigDecimal) new JSONObject(makeRequest(addUrl, postJson).body()).get("quotient");
+    }
+
+    private static HttpResponse<String> makeRequest(URI uri, JSONObject jsonBody)
+            throws IOException, InterruptedException {
+        HttpRequest httpRequest = HttpRequest.newBuilder()
+                .header("Content-Type","application/json")
+                .uri(uri)
+                .POST(HttpRequest.BodyPublishers.ofString(String.valueOf(jsonBody)))
+                .build();
+        return httpClient.send(httpRequest, HttpResponse.BodyHandlers.ofString());
+    }
+
+}

src/main/java/com/gmgauthier/server/CalculatorServer.java

@@ -1,4 +1,4 @@
-package com.gmgauthier;
+package com.gmgauthier.server;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -8,8 +8,8 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
  * Spring Boot application starter class
  */
 @SpringBootApplication
-public class Application {
+public class CalculatorServer {
     public static void main(String[] args) {
-        SpringApplication.run(Application.class, args);
+        SpringApplication.run(CalculatorServer.class, args);
     }
 }

src/main/java/com/gmgauthier/server/controllers/CalculatorController.java

@@ -1,4 +1,4 @@
-package com.gmgauthier.controllers;
+package com.gmgauthier.server.controllers;
 
 import org.json.JSONObject;
 import org.springframework.http.HttpStatus;

src/test/java/com/gmgauthier/client/requests/CalculatorClientTests.java

@@ -0,0 +1,13 @@
+package com.gmgauthier.client.requests;
+
+import org.junit.Test;
+
+public class CalculatorClientTests {
+
+    @Test
+    public void testDummy() throws Exception {
+        assert true;
+    }
+
+
+}

src/test/java/com/gmgauthier/server/requests/CalculatorControllerTest.java

@@ -1,4 +1,4 @@
-package com.gmgauthier.requests;
+package com.gmgauthier.server.requests;
 
 import com.hackerrank.test.utility.OrderedTestRunner;
 import com.hackerrank.test.utility.TestWatchman;