Java string concat() method vs "+" operator

The notable differences between concat() method and +operator are:

concat() method	+operator
You cannot concat a null value to a String using the concat() method.	You can concat null value using the ‘+’ operator.
Using the concat() method you can concat only two String variables.	Using the ‘+’ operator you can concat multiple values.
Using the concat() method you can concat only String type of arguments.	Using the ‘+’ operator you can concat any type of arguments.