import java.util.ArrayList;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    ArrayList<Button> list = new ArrayList<Button>();

    int i;

    Test() {
        for (i = 0; i < 10; i++) {
            Button b = new Button(i);
            b.l = new Listener() {
                @Override
                public void trigger() {
                    System.out.println(i + "");
                }
            };
            list.add(b);
        }

        for (Button b : list) {
            b.l.trigger();
        }
    }

    class Button {
        int i;
        Listener l;

        Button(int i) {
            this.i = i;
        }

        public void setListener(Listener l) {
            this.l = l;
        }
    }

    interface Listener {
        public void trigger();
    }
}