¿Los parámetros del método son variables locales?

Are method parameters local variables?

3 Answers. There is no difference. A parameter is just a local variable which is initialized with the passed argument at invokation time.

In Java, you can qualify local variables and method parameters with the final keyword. Doing so results in not being able to reassign x and qwerty in the body of the method. This practice nudges your code in the direction of immutability which is generally considered a plus.

A parameter is a named variable passed into a function. Parameter variables are used to import arguments into functions. Note the difference between parameters and arguments: Function parameters are the names listed in the function’s definition. Function arguments are the real values passed to the function.

Like methods, local variables and parameters need not to be declared final. As others said before, this clutters the code becoming less readable with very little efford for compiler performace optimisation, this is no real reason for most code fragments. Although it creates a little clutter, it is worth putting final.

The compiler will also fail if you do not break on every case (that you set the variable). This allows you to make Java very similar to Lisp’s let expressions and makes it so your code is not massively indented (because of lexical scoping variables). The final variable forces a single evaluation of what name should be.

As habits go, it’s not a bad one to develop. At the least, making a variable final specifies the intent of the programmer at the time of writing. This is important as it might give subsequent programmers who edit the code pause for thought before they start changing how that variable is used.