'Category' and 'Kind' terms are used to describe same thing.

[Dmitry Lazutkin]

Hi. I found two sentences that use different wording to describe diversity
of Java types.

In introduction to *Chapter 4:*

*The types of the Java programming language are divided into two
categories: primitive types and reference types.*

And further right at the beginning of *4.1. The Kinds of Types and Values:*

*There are two kinds of types in the Java programming language: primitive
types (§4.2
<https://docs.oracle.com/javase/specs/jls/se14/html/jls-4.html#jls-4.2>)
and reference types (§4.3
<https://docs.oracle.com/javase/specs/jls/se14/html/jls-4.html#jls-4.3>).*

IMHO: For me, as non-native English reader the terms 'Category' and 'Kind'
in that context mean pretty much the same thing but have some subtle
differences so I think that it would be better to use only one term
(personally I vote for 'Category')