Computing Functions StaticValues

Functions that Return Static Values

Null	Return null value
Nil	Return null value such as Null. Use it when you can't save "null" in interface
True	Return boolean value 'true'
False	Return boolean value 'false'

Null

This function returns null

System.out.println(engine.calc("null"));
System.out.println(engine.calc("null") == null);

Output

null
true

Nil

Return null value such as Null. Use it when you can't save "null" in interface.

True

Return boolean value 'true'

System.out.println(engine.calc("true"));
System.out.println(Boolean.TRUE.equals(engine.calc("true")));
System.out.println(Boolean.FALSE.equals(engine.calc("true")));

Output

true
true
false

False

Return boolean value 'false'

System.out.println(engine.calc("false"));
System.out.println(Boolean.TRUE.equals(engine.calc("false")));
System.out.println(Boolean.FALSE.equals(engine.calc("false")));

Output

false
false
true