Improving coding style into functions or methods

Method modifiers should be given in the following order: static abstract synchronized final native
The modifier (if present) must be the first modifier.
public static double square(double a); // NOT: static public double square(double a);
is one of public, protected or private while includes volatile and transient. The most important lesson here is to keep the access modifier as the first modifier. Of the possible modifiers, this is by far the most important, and it must stand out in the method declaration. For the other modifiers, the order is less important, but it make sense to have a fixed convention.