[JAVA] Which octal literals can be used depends on the programming language

(This article is a multipost with Go to the Horizon)

There are three main grammars for noting octal numbers. (The second and third are confusing, but they are zero o [^ octet])

• Prefix with 0 (eg 0123)
• Add 0o as a prefix (eg 0o123)
• Add 0O as a prefix (eg 0O123)

Of these, the table summarizes which grammar each programming language uses.

Consideration

• C, Java, etc. only use the prefix 0
• Scala and Python used the prefix 0 but stopped
• C # and Kotlin don't use octal notation in the first place
• As a recent trend, the prefix 0o has been adopted.

"I write the octal number as 0123 "may be old.

[^ octet]: octet (8-piece set) o [^ js]: However, if 0 is followed by 8 or 9, it is a decimal number. Reference: lexical grammar --JavaScript | MDN