All courses and interfaces which are referred to by the use of variable or variable declarations, or process connect with or subject entry expressions. This answer is for rescuing novice Java programmers through the irritation brought on by a standard slip-up. I recommend you read through the acknowledged answer For https://rafaelzfebz.bloggactif.com/35091480/the-smart-trick-of-ups-uninterruptible-power-supply-that-no-one-is-discussing