Class Class1

test-app/app/src/main/java/com/tns/tests/Class1.java:7–44

import android.util.Log;

public class Class1 {
    public static boolean IsCollected;

    public Class1() {
        IsCollected = false;
    }

    public String getMessage() {
        return "Hello from Class1 instance";
    }

    @Override
    protected void finalize() {
        IsCollected = true;
    }

    public interface Callback1 {
        String getMessage();
    }

    public static class Class2 {
        public static boolean printMessageWithDelay(final Callback1 cb, final long delay) {
            Handler mainThreadHandler = new Handler(Looper.getMainLooper());

            Runnable r = new Runnable() {
                @Override
                public void run() {
                    String s = cb.getMessage();
                    Log.d("TestApp", "printMessgeWithDelay=" + s);
                }
            };

            boolean success = mainThreadHandler.postDelayed(r, delay);

            return success;
        }
    }
}