What is the difference between return and return null in Java?

What is the difference between return and return null in Java?

The biggest difference:
Return
The return value of the method must be void!
return null;
The return value of the method must not be the original data type (the wrapper class has been removed) and the void!

Return is the way to jump out ...
Return null also jumps out of the method and returns null:

That is, return null must be used in a method that returns a value other than void:
Return can be used in any method

Do not assume that NULL is not a value. Null is the value.
The real no value is ...
such as you string s, this time S is no value. But if string s = Null;s are all valued: Just a value of NULL

What is the difference between return and return null in Java?