Revise paste Untitled

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Main {
    public static  void main(String[] args) {
        List<Thread> list = new ArrayList<>();
        final Factory f = new Factory(5);
        int i;
        for(i = 0; i < 5; i++) {
                list.add(new Thread(new Runnable() {
                    @Override
                    public void run() {
                        Random rand = new Random();
                        if(rand.nextInt() % 2 == 0) {
                            f.buy_vaccine();
                        }
                        else {
                            f.produce_vaccine("v1");
                        }
                    }
                }));
            
        }
        for( i = 0; i < 5; i++) {
            list.get(i).start();
        }
        for( i = 0; i < 5; i++) {
            try {
                list.get(i).join();
            }
            catch (InterruptedException ex)
            {

}
        }
    }
}

Mark as private (unlisted)