In Velocity, you can declare a variable and set its value by using the #set directive, for example:

##String 
#set ($var = "abc") 
##Boolean 
#set($var2 = true) 
##Value 
#set($var3 = 10)

The above example shows that $var has a string value, $var2 has a Boolean value, and $var3 has a numerical value. The #set directive can also set an array to a declared Velocity variable. To assign an array to a variable type, for example:

#set($var = ["a", "b", "c"])