src/java.desktop/share/classes/javax/swing/plaf/synth/SynthButtonUI.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -193,11 +193,11 @@
             throw new IllegalArgumentException(
                     "Width and height must be >= 0");
         }
         AbstractButton b = (AbstractButton)c;
         String text = b.getText();
-        if (text == null || "".equals(text)) {
+        if (text == null || text.isEmpty()) {
             return -1;
         }
         Insets i = b.getInsets();
         Rectangle viewRect = new Rectangle();
         Rectangle textRect = new Rectangle();