SAP ABAP 理解RAWSTRING(XSTRING) 类型

用F1查看的时候，这里是这样说的：

The types RAWSTRING and STRING have a variable length. A maximum length for these types can be specified, but has no upper limit.

The type SSTRING is available as of release 6.10 and it has a variable length. Its maximum length must be specified and is limited to 255. The advantage of this type compared with CHAR, is that it is assigned to the ABAP type string.

效果如下：

用几个例子说明一下

例子1：

 DATA str TYPE sSTRING.

DATA str1 TYPE string.

DATA str2 TYPE xstring."这个就是rawstring类型

DATA STR3 TYPE STRING.

str = '好好学习'.

str1 = str.

str2 = str.

WRITE :/ 'str1:',str1.

ULINE.

WRITE :/ 'str2:',str2.

ULINE.

STR3 = STR2.

WRITE :/ 'str3:',STR3.

ULINE.

结果：