public class ApplicationRunner {

    public static void main(String[] args) {
        RunService firstService = new RunService(0);
        RunService secondService = new RunService(1);
        Thread firstThread = new Thread(firstService, "first");
        Thread secondThread = new Thread(secondService, "second");
        firstThread.start();
        secondThread.start();
    }

}

class RunService implements Runnable{
    public int i;
    
    public RunService(int i){
        this.i = i;
    }

    @Override
    public void run() {
        Thread thread = Thread.currentThread();
            // someMethod();
    }
}

interface Service{

    void someMethod();

}

class FirstServiceImpl implements Service{

    @Override
    public void someMethod(){
        System.out.println("First implementation");
    }

}

class SecondServiceImpl implements Service{

    @Override
    public void someMethod(){
        System.out.println("Second implementation");
    }

}