src/macosx/classes/sun/lwawt/LWWindowPeer.java

@@ -534,11 +534,20 @@
         return windowState;
     }
 
     @Override
     public void setMaximizedBounds(Rectangle bounds) {
-        // TODO: not implemented
+        if (bounds == null) {
+            platformWindow.setMaximizedBounds(-1, -1, -1, -1);
+        } else {
+            platformWindow.setMaximizedBounds(
+                    bounds.x == Integer.MAX_VALUE ? -1 : bounds.x,
+                    bounds.y == Integer.MAX_VALUE ? -1 : bounds.y,
+                    bounds.width == Integer.MAX_VALUE ? -1 : bounds.width,
+                    bounds.height == Integer.MAX_VALUE ? -1 : bounds.height
+            );
+        }
     }
 
     @Override
     public void setBoundsPrivate(int x, int y, int width, int height) {
         setBounds(x, y, width, height, SET_BOUNDS | NO_EMBEDDED_CHECK);