Best practice when compare enum (iluwatar#869)

Author: hoangnam2261

chain/src/main/java/com/iluwatar/chain/OrcCommander.java

@@ -35,7 +35,7 @@ public OrcCommander(RequestHandler handler) {
 
   @Override
   public void handleRequest(Request req) {
-    if (req.getRequestType().equals(RequestType.DEFEND_CASTLE)) {
+    if (RequestType.DEFEND_CASTLE == req.getRequestType()) {
       printHandling(req);
       req.markHandled();
     } else {

chain/src/main/java/com/iluwatar/chain/OrcOfficer.java

@@ -35,7 +35,7 @@ public OrcOfficer(RequestHandler handler) {
 
   @Override
   public void handleRequest(Request req) {
-    if (req.getRequestType().equals(RequestType.TORTURE_PRISONER)) {
+    if (RequestType.TORTURE_PRISONER == req.getRequestType()) {
       printHandling(req);
       req.markHandled();
     } else {

chain/src/main/java/com/iluwatar/chain/OrcSoldier.java

@@ -35,7 +35,7 @@ public OrcSoldier(RequestHandler handler) {
 
   @Override
   public void handleRequest(Request req) {
-    if (req.getRequestType().equals(RequestType.COLLECT_TAX)) {
+    if (RequestType.COLLECT_TAX == req.getRequestType()) {
       printHandling(req);
       req.markHandled();
     } else {