can anyone tell me why?

- "name == null" : Checks the "name" variable is pointing to null. But, - "name.isEmpty()" : Checks the "name" variable's "value" is empty or not. - So, here we go : If you enter an empty line like below in your input: ------ex 1----- Tommy 2 3 4 (empty line) (cursor is now in this line) - Now, "name" variable has a value of the empty string, thus "name.isEmpty()" will work ( because it checks the value of "name" variable which is an empty string) - But "name == null" will NOT work because it checks if "name" is pointing to a null variable which is obviously false (because "name" contains an empty string and not null). - if (name == null || name.isEmpty()) throws an error bcz, the first condition doesn't work - if (name.isEmpty() || name == null) works fine bcz, first condition is satisfied ------ex 2----- Tommy 2 3 4 (cursor is now in this line) - In the above example, there is no empty space left after "4". So here, "name" variable has "no value". - Now, "name.isEmpty()" checks for the value of the variable "name". - Variable "name" first of all doesn't have a "value", and thus "name" is pointing to a "null variable", So it throws an error of "nullPointer Exception" - But "name == null" will work because it checks if "name" is pointing to the null variable which is obviously true. - if (name == null || name.isEmpty()) works fine bcz, first condition is satisfied. - if (name.isEmpty() || name == null) throws an error bcz, first condition doesn't work.

Hey! If a string is null, then isEmpty() will throw a NullPointerException. However, you are evaluating your expression in different ways. Now, if the left side of the expression (bool || bool_2) is true, then the right side will not be evaluated. So if your string is null, the first expression works fine because "name.isEmpty()" will not be evaluated. In the remaining two options, it will, and it throws a NullPointerException. Best wishes :)

@Angela, You need to raise a question with your task code included with it for any help..