Does the order of a Java class matter?

Question

Is there any difference between the following? :

Example 1:

public class OddEven {

private static void OddEven() {
    //some calculation.
}

public static void main(String[] args) {
   OddEven();
}
}

Example 2:

public class OddEven {

private static void main(String[] args) {
   OddEven();
}

private static void OddEven() {
    //some calculation.
}
}

The reason I ask is I would always go with example 2, putting Main first. Though most of the examples I've seen online put the methods first, before Main.

I've never had formal computing lessons, and I apologise if this is an obvious question, but I'd like to know:

• Is the order of the layout simply aesthetics, or convention?
• Does it make any difference in processing efficiency and/or memory?
• If so, is that saving seen for all programming languages?

Thanks for any help on this topic.

Answer 1

No, there is no difference. Java doesn't care about the declaration order of methods in a class.

Answer 2

The order does not matter. But there is a common courtesy to public methods and static methods at the beginning of a class. This is just a developers choice