Literals

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Literals

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Use a literal to specify a value directly in an operation.

Integers

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Use an integer literal to specify an integer type value in decimal, octal, or hex notation of a primitive type int, long, float, or double. Use the following single letter designations to specify the primitive type: l or L for long, f or F for float, and d or D for double. If not specified, the type defaults to int. Use 0 as a prefix to specify an integer literal as octal, and use 0x or 0X as a prefix to specify an integer literal as hex.

Grammar

INTEGER: '-'? ( '0' | [1-9] [0-9]* ) [lLfFdD]?;
OCTAL:   '-'? '0' [0-7]+ [lL]?;
HEX:     '-'? '0' [xX] [0-9a-fA-F]+ [lL]?;

Examples

Integer literals.
```
0     
0D    
1234L 
-90f  
-022  
0xF2A 
```
int 0

double 0.0

long 1234

float -90.0

int -18 in octal

int 3882 in hex

Floats

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Use a floating point literal to specify a floating point type value of a primitive type float or double. Use the following single letter designations to specify the primitive type: f or F for float and d or D for double. If not specified, the type defaults to double.

Grammar

DECIMAL: '-'? ( '0' | [1-9] [0-9]* ) (DOT [0-9]+)? EXPONENT? [fFdD]?;
EXPONENT: ( [eE] [+\-]? [0-9]+ );

Examples

Floating point literals.
```
0.0      
1E6      
0.977777 
-126.34  
89.9F    
```
double 0.0

double 1000000.0 in exponent notation

double 0.977777

double -126.34

float 89.9

Strings

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Use a string literal to specify a String type value with either single-quotes or double-quotes. Use a \" token to include a double-quote as part of a double-quoted string literal. Use a \' token to include a single-quote as part of a single-quoted string literal. Use a \\ token to include a backslash as part of any string literal.

Grammar

STRING: ( '"'  ( '\\"'  | '\\\\' | ~[\\"] )*? '"'  )
      | ( '\'' ( '\\\'' | '\\\\' | ~[\\'] )*? '\'' );

Examples

String literals using single-quotes.

'single-quoted string literal'
'\'single-quoted with escaped single-quotes\' and backslash \\'
'single-quoted with non-escaped "double-quotes"'

String literals using double-quotes.

"double-quoted string literal"
"\"double-quoted with escaped double-quotes\" and backslash: \\"
"double-quoted with non-escaped 'single-quotes'"

Characters

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Character literals are not specified directly. Instead, use the cast operator to convert a String type value into a char type value.

« Keywords Identifiers »

	`int 0`
	`double 0.0`
	`long 1234`
	`float -90.0`
	`int -18` in octal
	`int 3882` in hex

	`double 0.0`
	`double 1000000.0` in exponent notation
	`double 0.977777`
	`double -126.34`
	`float 89.9`