Underscores in Integer Literals

When you are writing large numbers 1000000000 isn't very visually distinct from 10000000000.

To help with the legibility you are allowed to insert underscores between digits in an integer literal.

void main() {
int x = 1_000_000_000;
int y = 10_000_000_000;

IO.println(x);
IO.println(y);
}

This works with hexadecimal integer literals as well.

void main() {
int white = 0xFF_FF_FF;

IO.println(Integer.toHexString(white));
}