Java print arraylist numbered -

i have this

public string tostring() {         return "a " + year + " " +  make + " " + model +                 " vin# of " + vin + " , mileage of " + miles; } 

and this:

arraylist<auto> autos = new arraylist<auto>(); 

and this:

 public static void loadnewdata(arraylist<auto> a, arraylist<customer> c)     {         a.add(new auto(2009,"ford" , "mustang","abc123", 1256.54));         a.add(new auto(2010,"chevy","camero","qwi459", 33.98));         a.add(new auto(1970,"pink","cadillac","950akh", 212874.51));         a.add(new auto(2007,"lotus","elise mkii","1a2d3f", 12859.90));          c.add(new customer( "brett farve",false));         c.add(new customer( "bruce springsteen",true));         c.add(new customer( "mickey mouse", true));         c.add(new customer( "peyton manning", true));         c.add(new customer( "donald duck", true));     } 

i join , print:

system.out.println(autos.tostring()); 

but comes out this:

[a 2009 ford mustang vin# of abc123 , mileage of 1256.54, 2010 chevy camero vin# of qwi459 , mileage of 33.98, 1970 pink cadillac vin# of 950akh , mileage of 212874.51, 2007 lotus elise mkii vin# of 1a2d3f , mileage of 12859.9] 

how can make print come out this:

1. a 2009 ford mustang vin# of abc123 , mileage of 1256.54
2. a 2010 chevy camero vin# of qwi459 , mileage of 33.98
3. a 1970 pink cadillac vin# of 950akh , mileage of 212874.51
4. a 2007 lotus elise mkii vin# of 1a2d3f , mileage of 12859.9

loop on list , system.out.println each entry. this:

for (int = 0; < autos.size(); i++) {     system.out.println((i + 1) + ". " + autos.get(i)); }