--- a/src/extensions.st	Tue Feb 21 20:08:15 2012 +0000
+++ b/src/extensions.st	Wed Feb 22 22:30:38 2012 +0000
@@ -1,5 +1,19 @@
 "{ Package: 'stx:libjava' }"!
 
+!Behavior methodsFor:'queries'!
+
+isInterface
+    "return true, if the receiver is a Java interface"
+
+    ^ false
+
+    "
+     True isInterface
+    "
+
+    "Created: / 22-02-2012 / 21:53:20 / Jan Vrany <jan.vrany@fit.cvut.cz>"
+! !
+
 !Boolean class methodsFor:'queries'!
 
 isJavaPrimitiveType