You're not a compiler

At conferences, gifts are often distributed at stands. Usually you need to solve some kind of puzzle.

Innocent puzzle

Some of the tasks involve solving a puzzle with code like this:

What will be the result of the following code:
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public class Sum {

    public static void main(String[] args) {
        System.out.println(0123 + 3210);
    }
}

1. 3293
2. 3333
4. IllegalArgumentException

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service() javax.servlet.http.HttpServlet?

1. public void service(ServletRequest, ServletResponse)
2. public void service(HttpServletRequest, HttpServletResponse)
3. public int service(ServletRequest, ServletResponse)
4. public int service(HttpServletRequest, HttpServletResponse)
5. protected void service(ServletRequest, ServletResponse)
6. protected void service(HttpServletRequest, HttpServletResponse)
7. protected int service(ServletRequest, ServletResponse)
8. protected int service(HttpServletRequest, HttpServletResponse)

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