import java.util.*;


public class MainThread {

    @SuppressWarnings("deprecation")
    public static void main (String[] args){
        List<Integer> IntList = new ArrayList<Integer>();

        Inputter Input2 = new Inputter((IntList));

        Outputter Output2 = new Outputter((IntList));


        Thread i = new Thread (Input2);

        Thread j = new Thread (Output2);
        try
        {
        i.start();
        Thread.sleep(2);
        j.start();

        Thread.sleep(20);

        i.stop();
        j.stop();
        }
        catch (Exception e)
        {

        }

        System.out.println("végül: " + IntList.size());
    }


}

====================================================================================================

import java.util.*;


public class Outputter implements Runnable {

List<Integer> a;

    Outputter (List<Integer> _a){
        a = _a;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(true){
            int ExampleInt = a.get(a.size() - 1);
            System.out.println(ExampleInt);
            a.remove(a.size() - 1);
            Thread.yield();
        }
    }

}


====================================================================================================

import java.util.*;


public class Inputter implements Runnable {

    List<Integer> a;

    Inputter (List<Integer> _a){
        a = _a;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub

        while(true){
            int ExampleInt = a.size()+1;
            a.add(ExampleInt);
            Thread.yield();
        }
    }

}