关于新版本中的exception classes

在sap6.10版本里,exception classes已经取代了catchable runtime errors,Each exception class includes

message texts 下面是异常类的继承层结构,想要查看每个类的描述,用类制作器进行查看
CX_SY_ROOT
  |
  |--CX_STATIC_CHECK :
  |
  |--CX_DYNAMIC_CHECK
  |    |
  |    |--CX_SY_ARITHMETIC_ERROR
  |    |    |
  |    |    |-- CX_SY_ZERODIVIDE
  |    |    |
  |    |    |-- CX_SY_ARITHMETIC_OVERFLOW
  |    |    |
  |    |    |-- CX_SY_ARG_OUT_OF_DOMAIN
  |    |    |
  |    |    |-- CX_SY_PRECISION_LOSS
  |    |
  |    |--CX_SY_ASSIGN_ERROR
  |    |    |
  |    |    |-- CX_SY_ASSIGN_CAST_ERROR
  |    |    |    |
  |    |    |    |-- CX_SY_ASSIGN_CAST_ILLEGAL_CAST
  |    |    |    |
  |    |    |    |-- CX_SY_ASSIGN_CAST_UNKNOWN_TYPE
  |    |    |
  |    |    |-- CX_SY_ASSIGN_OUT_OF_RANGE
  |    |
  |    |--CX_SY_CODEPAGE_CONVERTER_INIT
  |    |
  |    |--CX_SY_CONVERSION_ERROR
  |    |    |
  |    |    |-- CX_SY_CONVERSION_OVERFLOW
  |    |    |
  |    |    |-- CX_SY_CONVERSION_NO_NUMBER
  |    |    |
  |    |    |-- CX_SY_CONVERSION_CODEPAGE
  |    |    |
  |    |    |-- CX_SY_CONVERSION_BASE64
  |    |    |
  |    |    |-- CX_SY_CONV_ILLEGAL_DATE_TIME
  |    |
  |    |--CX_SY_CREATE_ERROR
  |    |    |
  |    |    |-- CX_SY_CREATE_OBJECT_ERROR
  |    |    |
  |    |    |-- CX_SY_CREATE_DATA_ERROR
  |    |
  |    |--CX_SY_DATA_ACCESS_ERROR
  |    |    |
  |    |    |-- CX_SY_RANGE_OUT_OF_BOUNDS
  |    |    |
  |    |    |-- CX_SY_OFFSET_NOT_ALLOWED
  |    |
  |    |--CX_SY_DYN_CALL_ERROR
  |    |    |
  |    |    |-- CX_SY_DYN_CALL_ILLEGAL_CLASS
  |    |    |
  |    |    |-- CX_SY_DYN_CALL_ILLEGAL_FORM
  |    |    |
  |    |    |-- CX_SY_DYN_CALL_ILLEGAL_FUNC
  |    |    |
  |    |    |-- CX_SY_DYN_CALL_ILLEGAL_METHOD
  |    |    |
  |    |    |-- CX_SY_DYN_CALL_PARAMETER_ERROR
  |    |         |
  |    |         |-- CX_SY_DYN_CALL_EXCP_NOT_FOUND
  |    |         |
  |    |         |-- CX_SY_DYN_CALL_ILLEGAL_TYPE
  |    |         |
  |    |         |-- CX_SY_DYN_CALL_PARAM_MISSING
  |    |         |
  |    |         |-- CX_SY_DYN_CALL_PARAM_NOT_FOUND
  |    |
  |    |--CX_SY_FILE_ACCESS_ERROR
  |    |    |
  |    |    |-- CX_SY_FILE_AUTHORITY
  |    |    |
  |    |    |-- CX_SY_FILE_CLOSE
  |    |    |
  |    |    |-- CX_SY_FILE_IO
  |    |    |
  |    |    |-- CX_SY_FILE_OPEN
  |    |    |
  |    |    |-- CX_SY_FILE_OPEN_MODE
  |    |    |
  |    |    |-- CX_SY_FILE_POSITION
  |    |    |
  |    |    |-- CX_SY_FILE_TRUNCATE
  |    |
  |    |--CX_SY_GEN_SOURCE_TOO_WIDE
  |    |
  |    |--CX_SY_IMPORT_MISMATCH_ERROR
  |    |
  |    |--CX_SY_MOVE_CAST_ERROR
  |    |
  |    |--CX_SY_PROGRAM_NOT_FOUND
  |    |
  |    |--CX_SY_PROVIDE_EXCEPTION
  |    |    |
  |    |    |-- CX_SY_PROVIDE_INTERVAL_OVERLAP
  |    |    |
  |    |    |-- CX_SY_PROVIDE_TABLE_NOT_SORTED
  |    |
  |    |--CX_SY_READ_SRC_LINE_TOO_LONG
  |    |
  |    |--CX_SY_REF_IS_INITIAL
  |    |
  |    |--CX_SY_REPLACE_INFINITE_LOOP
  |    |
  |    |--CX_SY_SCAN_SOURCE_TOO_WIDE
  |    |
  |    |--CX_SY_SQL_ERROR
  |    |    |
  |    |    |-- CX_SY_OPEN_SQL_ERROR
  |    |    |    |
  |    |    |    |-- CX_SY_OPEN_SQL_DB
  |    |    |    |
  |    |    |    |-- CX_SY_DYNAMIC_OSQL_ERROR
  |    |    |         |
  |    |    |         |--CX_SY_DYNAMIC_OSQL_SEMANTICS
  |    |    |         |
  |    |    |         |--CX_SY_DYNAMIC_OSQL_SYNTAX
  |    |    |
  |    |    |-- CX_SY_NATIVE_SQL_ERROR
  |    |
  |    |--CX_SY_WRITE_SRC_LINE_TOO_LONG
  |    |
  |    |--CX_XSLT_EXCEPTION
  |         |
  |         |--CX_XSLT_SYSTEM_ERROR
  |             |
  |             |-- CX_XSLT_ABAP_CALL_ERROR
  |             |
  |             |-- CX_XSLT_DESERIALIZATION_ERROR
  |             |
  |             |-- CX_XSLT_FORMAT_ERROR
  |             |
  |             |-- CX_XSLT_RUNTIME_ERROR
  |             |
  |             |-- CX_XSLT_SERIALIZATION_ERROR
  |
  |--CX_NO_CHECK
       |
       |--CX_SY_EXPORT_NO_SHARED_MEMORY
       |
       |--CX_SY_EXPORT_BUFFER_NO_MEMORY
       |
       |--CX_SY_GENERATE_SUBPOOL_FULL
       |
       |--CX_SY_LOCALIZATION_ERROR
       |
       |--CX_SY_NO_HANDLER
       |
       |--CX_SY_PIPES_NOT_SUPPORTED
       |
       |--CX_SY_PIPE_REOPEN
       |
       |--CX_SY_REMOTE_CALL_ERROR
       |    |
       |    |--CX_SY_RMC_COMM_FAILURE
       |    |
       |    |--CX_SY_RMC_INVALID_STATUS
       |    |
       |    |--CX_SY_RMC_SYSTEM_FAILURE
       |
       |--CX_SY_TOO_MANY_FILES

举个例子
使用exception classes
data MYREF type ref to CX_SY_ARITHMETIC_ERROR.
data ERR_TEXT type STRING.
data RESULT type I.
try.
    RESULT = 1 / 0.
  catch cx_sy_arithmetic_error into MYREF.
    ERR_TEXT = MYREF->GET_TEXT( ).
………………
endtry.
这各写法在java里的
===================================
使用catchable runtime errors

data RESULT type I.
catch system-exceptions ARITHMETIC_ERRORS = 4.
  RESULT = 1 / 0.
endcatch.
if SY-SUBRC = 4.
  ...
endif.