// from http://www.javaworld.com/javaworld/jw-06-2001/j1-01-sintes3_p.html
// but modified for Vectors

// the commented won't compile currently (upto Java 1.4)
// so we fake it with an explicit implementation of a
// Vector_Integer_ class

import java.util.*;

public class Safe {

    public static void main( String [] args ) {

        //Vector<Integer> l = new Vector<Integer>();
        Vector_Integer_ l = new Vector_Integer_();
        
        Integer i1 = new Integer( 1 );
        Integer i2 = new Integer( 2 );
        String  i3 = "3"; 
        Integer i4 = new Integer( 4 );
        
        l.add( i1 );
        l.add( i2 );
        l.add( i3 );  // SHOULD RAISE A COMPILE-TIME ERROR NOW
        l.add( i4 );
        
        System.out.println( sum( l ) );
        
    }
    
    //public static int sum( Vector<Integer> l ) 
    public static int sum( Vector_Integer_ l ) 
    {   

        int counter = 0;

	// NO NEED TO CAST ANYMORE
        for(int i = 0; i<l.size(); i++) 
	    counter += l.elementAt(i).intValue();
        
        return counter;
    }
    
}