How to make a method in java execute only on call?

Question

Java

I am new to Java and have a question. Is it technically possible to implement a method that will not be executed until it is called by another method.
Roughly speaking, the code is something like this. I need the restart() method to be executed only when the run() method calls it, provided that the value of Running == false. However, the method is executed when the program starts, until the conditions I need are met.

class Game{

private boolean running = true;

public void run() {
        while (running) {
            тут какие то методы которые выполняются и не мешают
        }
        while (!running){
              restart();
        }
    }

public boolean restart() {
            running = true;
            return true;
    }

}

Answer 1

The method cannot be executed by itself if you have, for example, two methods in the listing, one as the entry point to the program will be launched at startup, the second and others only if you call it