boolean is a primitive type whereas Boolean is wrapper class.Same applies for (int,Integer),(long,Long) etc.
Wrapper classes "wrap" the respective primitive data type into an object of that class.
They are used with collections, as primitive types are not allowed with collections.Also using wrapper classes give you access to many methods that you can call on that object.For eg. Character wrapper class have methods like:
isDigit() – to determine whether the character is digit.
isLower() – to determine whether the character is lower case alphabet.
is Letter() – to determine whether the character is an alphabet.
we cannot use the above methods if we use a primitive type as compared to a wrapper class.
