About the description order of Java system properties

I'm worried and remembered regularly, so make a note of it. "System property" that defines the amount of memory allocated to Java commands However, depending on the order of description, it is clear whether or not it can be referenced from the class.


$java -version
java version "1.8.0_131"

** Sample class ** The system property "kusatest" is referenced from the class and output.


import java.util.*;

public class Test {
    public static void main(String[] args) {

** Reference examples **

$ java -Dkusatest=a Test

** Examples that cannot be referenced **

$ java Test -Dkusatest=a

I wrote the class / Jar and wrote the properties later, so it was easy to make a mistake. I forget it every time and waste a few hours, so I want to remember it anymore.

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