I have a question about HASHCODE.

return hash.hashCode();

Are you curious about this part?

This code does not get the hashCode of super.

String hash = name + id + job;
return hash.hashCode();

You get the hashCode of the String-type instance that you created in the upper row. Overriding here is meaningless except to overwrite the method name.

When you ask questions, please write the code in text instead of screenshots. Don't forget to use code blocks.

Does hashCode() before overriding mean hashCode, a method of parent class? The method of the parent class is

super.method name (this)

You can invoke it as in . In this case, it would be super.hashCode(this).