Java string. Length ()

The string class in Java is in the Java. lang package.
String STR = new string ();
Str. length () is used to prevent Str. length = 4.
In addition, STR and length () have a feature that both Chinese and English are regarded as one length, rather than calculating the length based on the number of bytes occupied.
Why? I think it may be to block a Chinese character while intercepting a string.
You can use the string. getbytes () method.
Byte [] B _str = Str. getbytes ();
In this case, the B _str.length attribute is calculated based on the byte length.
At this time, if you want to truncate a string based on the actual length, you have to face the problem that Chinese characters may be intercepted. What should you do?