Why is C++ more picky than other language on making an array from a variable?

Question

Java
Int x = 5;
Int[] y = new int[x];
✓ all good
C++
Int x= 5;
Int y[x];
Nope
Even if x is a constant going through a method C++ is picky about it

Const int x = 5
Method(x);
}

Method ( const int x){
Int y[x];
}
Again it hates that

Answer 1

Author seems to compare dynamical array in java with constant array in cpp? But there are many ways to make dynamical array in c or cpp: malloc & realloc in c, instruction new in cpp or even STL vector. So, what's the problem?)

Answer 2

good

Answer 3

Ace thanks, it makes alot of sense now