Relational routines allow you to check affirmations based on booleans.
To access these routines, double-click Relational under the
system folder. The Relational
class contains
several routines, notably:
Routine |
Description |
Syntax |
---|---|---|
|
Checks if the variable provided is a null value. It returns |
|
|
Returns the complement of the logical value of an expression. |
|
|
Checks if the variable provided is a null value. It returns |
|
ISNULL
routine, along with
a tJava component, for
example:String str = null;
System.out.println(Relational.ISNULL(str));
In this example, the test result is displayed in the Run view: