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/**
 * The HelloWorldApp class implements an application that
 * simply displays "Hello World!" to the standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); //Display the string.
    }
}

Defines an input variable. Input variables are created at script start and assigned either the default value, or a value specified in the editor.

$amtToEmit:10 
$interval:15 
CurrentCoords <-amtToEmit SetCreeper 
<-interval Delay

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Pops a name of a variable and an item from the stack and stores the item in the variable.

# Build a string by concatenating "xy" and "z". 
# Store the number 123 in the variable named "xyz". 
"xy" "z" concat 123 ->! 
<-xyz trace