Is it problematic to assign a new value to a method parameter?

Question

Eclipse has an option to warn on assignment to a method\'s parameter (inside the method), as in:

public void doFoo(int a){
   if (a<0){
      a=0; // this         


        

Answer 1

The confusing-part is the reason for the warning. If you reassign a parameter a new value in the method (probably conditional), then it is not clear, what a is. That's why it is seen as good style, to leave method-params unchanged.