question: set up a day equal to 31 december 9999 . request the next day , it should be null . concode_field_sep PlaceHolder placeHolder concode_field_sep void testDateConstructor1 concode_elem_sep void testGetStart concode_elem_sep void test1Jan1900Next concode_elem_sep void testGetSerialIndex concode_elem_sep void testGetLastMillisecond concode_elem_sep void test1Jan1900Previous concode_elem_sep void testGetFirstMillisecondWithTimeZone concode_elem_sep void testNext concode_elem_sep void testGetLastMillisecondWithTimeZone concode_elem_sep void testGetFirstMillisecond concode_elem_sep void test31Dec9999Previous concode_elem_sep void testSerialization concode_elem_sep void testDateConstructor2 concode_elem_sep void testEqualsSelf concode_elem_sep void testGetLastMillisecondWithCalendar concode_elem_sep void testGetFirstMillisecondWithCalendar concode_elem_sep void testGetEnd concode_elem_sep void testParseDay concode_elem_sep void testHashcode concode_elem_sep void testNotCloneable concode_elem_sep void testEquals
target: void function ( ) { Day loc0 = new Day ( 31 , MonthConstants . DECEMBER , 9999 ) ; Day loc1 = ( Day ) loc0 . loc1 ( ) ; assertNull ( loc1 ) ; }