Dealing with integer by different radix

In Java, numbers can be written by various radix.

// radix 10
int value = 255;

// radix 16
value = 0xff; // starts from 0x
value = 0xFF; // ff can be written as upper case, but not common
value = 0Xff; // x can be upper case, but not common

// radix 8
value = 0377; // starts from 0

// radix 2
value = 0b11111111; // starts from 0b
value = 0b1111_1111; // under score can be put for separation

These are all same values essentially and given for convenience for programmers when reading.

Reference
https://gihyo.jp/book/2014/978-4-7741-6685-8