make(java): Update examples to use maven (#202)

* Fix RandomTsp.java

examples/java/FlowExample.java

@@ -10,21 +10,14 @@
 // 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 com.google.ortools.examples;
+package com.google.ortools.java;
 
+import com.google.ortools.Loader;
 import com.google.ortools.graph.MaxFlow;
 import com.google.ortools.graph.MinCostFlow;
 
-/**
- * Sample showing how to model using the flow solver.
- *
- */
-
+/** Sample showing how to model using the flow solver. */
 public class FlowExample {
-  static {
-    System.loadLibrary("jniortools");
-  }
-
   private static void solveMinCostFlow() {
     System.out.println("Min Cost Flow Problem - Simple interface");
     final int numSources = 4;
@@ -83,6 +76,7 @@ public class FlowExample {
   }
 
   public static void main(String[] args) throws Exception {
+    Loader.loadNativeLibraries();
     FlowExample.solveMinCostFlow();
     FlowExample.solveMaxFlow();
   }