question: public static void checkProxyMethod ( Object proxy , Method method ) { if ( proxy == null || ! Proxy . isProxyClass ( proxy . getClass ( ) ) ) { throw new IllegalArgumentException ( "Not a Proxy instance" ) ; } if ( Modifier . isStatic ( method . getModifiers ( ) ) ) { throw new IllegalArgumentException ( "Can't handle static method" ) ; } Class < ? > c = method . getDeclaringClass ( ) ; if ( c == Object . class ) { String name = method . getName ( ) ; if ( name . equals ( "hashCode" ) || name . equals ( "equals" ) || name . equals ( "toString" ) ) { return ; } } if ( isSuperInterface ( proxy . getClass ( ) , c ) ) { return ; } throw new IllegalArgumentException ( "Can't handle: " + method ) ; }
target:  Check if the given method is a method declared in the proxy interface implemented by the given proxy instance.