When should null values of Boolean be used?

Question

Java boolean allows values of true and false while Boolean allows true, false, and null. I have

Answer 1

Boolean wrapper is useful when you want to whether value was assigned or not apart from true and false. It has the following three states:

• True
• False
• Not defined which is null

Whereas boolean has only two states:

• True
• False

The above difference will make it helpful in Lists of Boolean values, which can have True, False or Null.