Does Java have a limit on the class name length?

The Java Language Specification states that identifiers are unlimited in length.

In practice though, the filesystem will limit the length of the resulting file name.

65535 characters I believe. From the Java virtual machine specification:

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.

here:

https://docs.oracle.com/javase/specs/jvms/se6/html/ClassFile.doc.html#88659