Java check if boolean is null

Question

How do you check if a boolean is null or not? So if I know "hideInNav" is null. How do I stop it from further executing? Something like the below doesn't seem to work but why?

boolean hideInNav = parent.getProperties().get("hideInNav", false); String hideNavigation = hideInNav != null ? hideInNav : ""; 

Answer 1

boolean can only be true or false because it's a primitive datatype (+ a boolean variables default value is false). You can use the class Boolean instead if you want to use null values. Boolean is a reference type, that's the reason you can assign null to a Boolean "variable". Example:

Boolean testvar = null; if (testvar == null) { ...} 

Answer 2

A boolean cannot be null in java.

A Boolean, however, can be null.

If a boolean is not assigned a value (say a member of a class) then it will be false by default.