int num = 00000010;
System.out.println(num);

int num = 00000100;
System.out.println(num);

int num = 00000010 << 1;
System.out.println(num);

00000010 => 1*8^1 + 0*8^0 => 8
00000100 => 1*8^2 + 0*8^1 + 0*8^0 => 64

00000100 => 00001000
(8 => 16)

0b000010 => 2