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Is
00, 000, or 000...
an integer in Java? Or is it an octal? If is it an octal is
001 or 0005
an octal?
829
If an integer constant begins with 0x or 0X, it is hexadecimal. If it begins with the digit 0, it is octal. Otherwise, it is assumed to be decimal.
Octal is a number system where a number is represented in powers of 8. So all the integers can be represented as an octal number. Also, all the digit in an octal number is between 0 and 7. In java, we can store octal numbers by just adding 0 while initializing. They are called Octal Literals.
An integer in Java is a memory location that can hold an integer, a positive or negative non-decimal number. It is denoted by the keyword, 'int'.
Zeros are ignored at the start of an int . If you need the zeros to be displayed, store the number as a String instead. If you need to use it for calculations later, you can convert it to an int using Integer.
All are integers, but...
1 is decimal
0 is decimal
01 is octal
00 is octal
From Java Language Specification (emphasis mine):
Note that octal numerals always consist of two or more digits; 0 is always considered to be a decimal numeral - not that it matters much in practice, for the numerals 0, 00, and 0x0 all represent exactly the same integer value.
99
Number literal representation examples in Java will give you the answer:
int decimal = 100;
int octal = 0144;
int hex = 0x64;
int binary = 0b1100100;
So 00, 000 and 0000 are all octal(base-8) integers.
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