--- old/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	2017-10-29 18:24:33.000000000 +0530
+++ new/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	2017-10-29 18:24:33.000000000 +0530
@@ -884,18 +884,26 @@
             NSPoint p = [NSEvent mouseLocation];
             NSRect frame = [self.nsWindow frame];
             NSRect contentRect = [self.nsWindow contentRectForFrameRect:frame];
-
+            
+            JNIEnv *env = [ThreadUtilities getJNIEnvUncached];
+            jobject platformWindow = [self.javaPlatformWindow jObjectWithEnv:env];
+            
             // Check if the click happened in the non-client area (title bar)
             if (p.y >= (frame.origin.y + contentRect.size.height)) {
-                JNIEnv *env = [ThreadUtilities getJNIEnvUncached];
-                jobject platformWindow = [self.javaPlatformWindow jObjectWithEnv:env];
                 if (platformWindow != NULL) {
-                    // Currently, no need to deliver the whole NSEvent.
-                    static JNF_MEMBER_CACHE(jm_deliverNCMouseDown, jc_CPlatformWindow, "deliverNCMouseDown", "()V");
-                    JNFCallVoidMethod(env, platformWindow, jm_deliverNCMouseDown);
-                    (*env)->DeleteLocalRef(env, platformWindow);
+                    // Toggle full screen upon double click on title bar.
+                    if([event clickCount] == 2) {
+                        static JNF_MEMBER_CACHE(jm_deliverNCDblClick, jc_CPlatformWindow, "deliverNCDblClick", "()V");
+                        JNFCallVoidMethod(env, platformWindow, jm_deliverNCDblClick);
+                    } else {
+                        // Currently, no need to deliver the whole NSEvent.
+                        static JNF_MEMBER_CACHE(jm_deliverNCMouseDown, jc_CPlatformWindow, "deliverNCMouseDown", "()V");
+                        JNFCallVoidMethod(env, platformWindow, jm_deliverNCMouseDown);
+                    }
                 }
             }
+            
+            (*env)->DeleteLocalRef(env, platformWindow);
         }
 }
 
--- old/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2017-10-29 18:24:34.000000000 +0530
+++ new/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2017-10-29 18:24:34.000000000 +0530
@@ -1074,6 +1074,13 @@
         }
     }
 
+    /* Do toggle full screen upon double click
+     * on non-client area(i.e., title bar)
+     */
+    private void deliverNCDblClick() {
+        execute(this::_toggleFullScreenMode);
+    }
+
     /*
      * Our focus model is synthetic and only non-simple window
      * may become natively focusable window.