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Java Language Specification,Chapter 3.10.1 Integer Literals
An integer literal may be expressed in decimal (base 10),hexadecimal
(base 16),octal (base 8),or binary (base 2).[…]
An octal numeral consists of an ASCII digit 0 followed by one or more
of the ASCII digits 0 through 7 interspersed with underscores,and can
represent a positive,zero,or negative integer.
现在你应该明白为什么010是8.