Data Types

As the name suggests, data-type specifies the type of the data present in the variable. Variables must be declared with a data-type.

Groovy offers various built-in data types:

Data type	Description	Example
int	used to represent whole numbers	int x = 99999
short	used to represent whole numbers	short x = 999
long	used to represent whole numbers	long x = 99999999999L
float	used to represent fractional numbers	float x = 22.79f
double	used to represent fractional numbers	double x = 99.99d
char	used to represent a single character	char grade = 'A'
boolean	used to represent Boolean data either true or false	boolean isAvailable = true
byte	Used to represent a byte value	byte x = 99
string	used to represent a series of characters	string msg = "Happy learning!"

Examples

int int_var = 99999 // integer variable
println int_var;

short short_var = 999 // short variable
println short_var;

long long_var = 99999999999L // long variable
println long_var;

float float_var = 22.79f // float variable
println float_var;

double double_var = 99.99d // double variable
println double_var;

char char_var = 'A' // char variable
println char_var;

boolean isAvailable = true // boolean variable
println isAvailable;

byte byte_var  = 99 // byte variable
println byte_var;

String msg = "Happy learning!" // String variable
println msg;

Check result here

Note:

; is optional in groovy