Is 00 integer or octal in Java?

Question

Is an

00, 000 or 000 ...

integer in java? Or is it an octal? If it is an octal value

001 or 0005

octal?

Answer 1

All are integers , but ...

1  is decimal
0  is decimal
01 is octal
00 is octal

From the Java Language Specification (highlighted by me):

Note that octal digits always consist of two or more digits; 0 is always considered a decimal digit , but this is not very important in practice, since the numbers 0, 00 and 0x0 represent exactly the same integer value.

Answer 2

Java :

int decimal = 100;
int octal = 0144;
int hex = 0x64;
int binary = 0b1100100;

, 00 000 0000 - ( 8) .

Answer 3

Directly from the specification

The octal digit consists of the ASCII digit 0, followed by one or more ASCII digits from 0 to 7, and may represent a positive, zero, or negative integer.

You can check 0 though 7