Java check if boolean is null
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) { ...}
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.
The only thing that can be a null is a non-primivite.
A boolean which can only hold TRUE or FALSE is a primitive. The TRUE/FALSE in memory are actually numbers (0 and 1)
0 = FALSE
1 = TRUE
So when you instantiate an object it will be nullString str; // will equal null
On the other hand if you instaniate a primitive it will be assigned to 0 default.
boolean isTrue; // will be 0
int i; // will be 0