Prefer String.contains() over String.indexOf() != -1

src/java/org/jivesoftware/openfire/http/ResourceServlet.java

@@ -60,7 +60,7 @@ public class ResourceServlet extends HttpServlet {
 
         if (!disableCompression) {
             if (request.getHeader("accept-encoding") != null &&
-                request.getHeader("accept-encoding").indexOf("gzip") != -1) {
+                    request.getHeader("accept-encoding").contains("gzip")) {
                 compress = true;
             }
             else if (request.getHeader("---------------") != null) {

src/java/org/jivesoftware/openfire/launcher/BrowserLauncher.java

@@ -312,7 +312,7 @@ public class BrowserLauncher {
             }
         }
         else if (osName.startsWith("Windows")) {
-            if (osName.indexOf("9") != -1) {
+            if (osName.contains("9")) {
                 jvm = WINDOWS_9x;
             }
             else {

src/java/org/jivesoftware/openfire/pubsub/NodeAffiliate.java

@@ -105,7 +105,7 @@ public class NodeAffiliate {
                     //        Alternate solution needed when XEP-0163 version > 1.0 is released.
                     //
                     // If the node ID looks like a JID, replace it with the published item's node ID.
-                    if (getNode().getNodeID().indexOf("@") >= 0) {
+                    if (getNode().getNodeID().contains("@")) {
                         items.addAttribute("node", publishedItem.getNodeID());                        
                     }