Java - comma operator outside for loop declaration

Question

I know I can use the comma operator like this

for (int i = 1, j = 15; j>10; i++, j--) {
    // do something neat
}

but some articles see

Answer 1

https://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.27

15.27. Expression

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Unlike C and C++, the Java programming language has no comma operator.