Output:
If you do not explicitly declare a SerialVersionUID , the JVM will calculate one for you at runtime. This calculation is based on the structure of your class (fields, methods, etc.).
If the built-in method feels cumbersome, several extensions automate this process: Java SerialVersion UID Generator
Alternatively, press Ctrl + . (Windows/Linux) or Cmd + . (Mac).
No extra tools required. Cons: Manual, copy-paste workflow breaks flow, and you need to ensure the class is compiled first.