Why can't Java initialize variables of different types in a for clause?

Question

Java

?Why can't you create a structure like

for(int i = 1, double j = 1.0; i<=10, j<=9.99; i++, j++) {}

But you can

for(double i = 1.0, j = 2.8; i<=10.0 || j<=9.99; i++, j+=0.38) {}

Why do the variables initialized in the first block of conditions of the for loop have to be of the same type?

Answer 1

Probably because you can't initialize variables this way outside of the for loop.
You can't write:
int a, double d
But you can like this:
int a; double d;
And in the cycle, the semicolon will already be the division of the block.
If you really feel like iterating over two variables, you can get around this like this:

int i = 1;
double j = 1.0;
for(; i<=10, j<=9.99; i++, j++) {}