Including sealing information Class.toGenericString()

Summary

Include sealed/non-sealed conceptual modifiers in the output of Class.toGenericString().

Problem

While appearing as a modifier in Java source, neither sealed nor non-sealed is not included in the output of Class.toGenericString(), which tends to include more information than Class.toString().

Solution

Update the specification and implementation of Class.toGenericString() to include sealed/non-sealed information for a class or interface.

Consistent with omitted implements and extends information, the list of permitted classes/interfaces is omitted by Class.toGenericString().

Specification

--- a/src/java.base/share/classes/java/lang/Class.java
+++ b/src/java.base/share/classes/java/lang/Class.java
@@ -261,7 +261,8 @@ public String toString() {

     /**
      * Returns a string describing this {@code Class}, including
-     * information about modifiers and type parameters.
+     * information about modifiers, {@link #isSealed() sealed}/{@code
+     * non-sealed} status, and type parameters.
      *
      * The string is formatted as a list of type modifiers, if any,
      * followed by the kind of type (empty string for primitive types