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-rw-r--r--libjava/java/text/DateFormat.java2
1 files changed, 2 insertions, 0 deletions
diff --git a/libjava/java/text/DateFormat.java b/libjava/java/text/DateFormat.java
index df2b270e4f3..76bf535577a 100644
--- a/libjava/java/text/DateFormat.java
+++ b/libjava/java/text/DateFormat.java
@@ -151,6 +151,8 @@ public abstract class DateFormat extends Format implements Cloneable
{
if (obj instanceof Number)
obj = new Date(((Number) obj).longValue());
+ else if (! (obj instanceof Date))
+ throw new IllegalArgumentException ("Cannot format given Object as a Date");
return format ((Date) obj, buf, pos);
}
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