Question:
Is this legal? Will this throw a compilation error?
long socialSecurityNumber = 999_99_9999L;
Answer:
In JavaSE7 and later, this is legal.
Using Underscore Characters in Numeric Literalsn Java SE 7 and later, any number of underscore characters (_) can appear anywhere between digits in a numerical literal. This feature enables you, for example. to separate groups of digits in numeric literals, which can improve the readability of your code.
For instance, if your code contains numbers with many digits, you can use an underscore character to separate digits in groups of three, similar to how you would use a punctuation mark like a comma, or a space, as a separator.
The following example shows other ways you can use the underscore in numeric literals:
long creditCardNumber = 1234_5678_9012_3456L;
long socialSecurityNumber = 999_99_9999L;
float pi = 3.14_15F;
long hexBytes = 0xFF_EC_DE_5E;
You can place underscores only between digits; you cannot place underscores in the following places:
At the beginning or end of a number
Adjacent to a decimal point in a floating point literal
Prior to an F or L suffix
In positions where a string of digits is expected
The following examples demonstrate valid and invalid underscore placements in numeric literals:
float pi1 = 3_.1415F; // Invalid; cannot put underscores adjacent to a decimal point
float pi2 = 3._1415F; // Invalid; cannot put underscores adjacent to a decimal point
long socialSecurityNumber1
= 999_99_9999_L; // Invalid; cannot put underscores prior to an L suffix
int x1 = _52; // This is an identifier, not a numeric literal
int x2 = 5_2; // OK (decimal literal)
int x3 = 52_; // Invalid; cannot put underscores at the end of a literal
int x4 = 5_______2; // OK (decimal literal)
int x5 = 0_x52; // Invalid; cannot put underscores in the 0x radix prefix
int x6 = 0x_52; // Invalid; cannot put underscores at the beginning of a number
int x7 = 0x5_2; // OK (hexadecimal literal)
int x8 = 0x52_; // Invalid; cannot put underscores at the end of a number
int x9 = 0_52; // OK (octal literal)
int x10 = 05_2; // OK (octal literal)
int x11 = 052_; // Invalid; cannot put underscores at the end of a number
Source
