--- a/src/java.base/share/classes/java/lang/Number.java	Wed May 15 16:21:51 2019 -0700
+++ b/src/java.base/share/classes/java/lang/Number.java	Mon May 20 10:32:10 2019 -0700
@@ -54,6 +54,11 @@
  */
 public abstract class Number implements java.io.Serializable {
     /**
+     * Constructor for subclasses to call.
+     */
+    public Number() {super();}
+
+    /**
      * Returns the value of the specified number as an {@code int}.
      *
      * @return  the numeric value represented by this object after conversion