java - Why output is not 311?

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65882494/why-output-is-not-311

Answer 1

Literals with a leading zero are octal literals. Any number prefixed with a 0 is considered octal. Octal numbers can only use digits 0-7, just like decimal can use 0-9, and binary can use 0-1. To define integer literals as octal value in Java is effortless.