String.java (toString): Check for this == null and throw NullPointerException.

1999-07-01  Bryce McKinlay  <bryce@albatross.co.nz>
        * java/lang/String.java (toString): Check for this == null and throw
        NullPointerException.

From-SVN: r27895

libjava/ChangeLog

+1999-07-01  Bryce McKinlay  <bryce@albatross.co.nz>
+
+	* java/lang/String.java (toString): Check for this == null and throw
+	NullPointerException.
+
 1999-07-01  Warren Levy  <warrenl@cygnus.com>
 
 	* gnu/gcj/convert/BytesToUnicode.java (read): Changed outlength

libjava/java/lang/String.java

@@ -115,6 +115,9 @@ public final class String
 
   public String toString ()
   {
+    // because String is final, we actually get this far on a null reference
+    if (this == null)
+      throw new NullPointerException();
     return this;
   }