Best Practices of Equals Testing in Java

Scratch.java

import java.util.Objects;

class Scratch {
    public static void main(String[] args) {
        String s = null;

        try {
            if (!s.equals("XXX")) {
                System.out.println("[WRONG-TESTING] NOT EXECUTED!");
            }

        } catch (NullPointerException e) {
            System.out.println("[WRONG-TESTING] LEAD TO NPE!");
        }

        if (!"XXX".equals(s)) {
            System.out.println("[BEST_PRACTICE-01] test with constant first!");
        }
        if (!Objects.equals("XXX", s)) { // using equals utility
            System.out.println("[BEST_PRACTICE-02] doesn't matter the object orders!");
        }
        if (!Objects.equals(s, "XXX")) { // using equals utility
            System.out.println("[BEST_PRACTICE-02] doesn't matter the object orders!");
        }
        if (Objects.equals(s, null)) { // using equals utility
            System.out.println("[BEST_PRACTICE-02] NULL == NULL!");
        }
    }
}

/* ##### OUTPUT is:
[WRONG-TESTING]     LEAD TO NPE!
[BEST_PRACTICE-01]  test with constant first!
[BEST_PRACTICE-02]  doesn't matter the object orders!
[BEST_PRACTICE-02]  doesn't matter the object orders!
[BEST_PRACTICE-02]  NULL == NULL!
 */