java - Java中变量名的长度限制

Question

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Answer 1

根据 the class file format spec (在第 4.11 节下):

The length of field and method names, field and method descriptors, and other constant string values is limited to 65535 characters by the 16-bit unsigned length item of the CONSTANT_Utf8_info structure (§4.4.7). Note that the limit is on the number of bytes in the encoding and not on the number of encoded characters. UTF-8 encodes some characters using two or three bytes. Thus, strings incorporating multibyte characters are further constrained.

这也适用于局部变量，因为 LocalVariableTable指向变量名称的 CONSTANT_Utf8_info 值。