multiple datatypes in a list supporting generics in Java 1.5

yes

Mickey123a at 2007-7-28 15:55:21 >

Depending on your datatypes then there are many different alternatives... the generics tutorial advises against using <Object> it advises using <?> instead.

Alternatively if your datatypes have a parent class they all inherit from then you can use List<? extends ParentClass> so the list will then accept any class which is a child of the ParentClass

The full PDF document on generics is here: -

http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

c0demonk3ya at 2007-7-28 15:55:21 >

> > ... using <?> instead.

>

> Try adding something in such a List.

Hey I'm just saying what the Sun Generics tutorial advises...

Personally I try to avoid having multiple datatypes in a single list as much as possible.

c0demonk3ya at 2007-7-28 15:55:21 >

> > > > ... using <?> instead.

> > >

> > > Try adding something in such a List.

> >

> > Hey I'm just saying what the Sun Generics tutorial

> advises...

>

> The tutorial probably meant to use the <?> in methods

> like this one for example:

> public static void

> display(java.util.Collection<?> c) {

> for(Object o : c) {

>System.out.println(o);

>}

> }

>

> Because you cannot do this:

> java.util.Collection<?> c = new

> java.util.ArrayList<String>();

> c.add("a String");

>

And because you cannot do this:

java.util.Collection<Object> c = new java.util.ArrayList<String>();

but of course you can do this:

java.util.Collection<Object> c = new java.util.ArrayList<Object>();

-Puce

Pucea at 2007-7-28 15:55:21 >

> > yes

>

> And, what did BigDaddy win?

Not even a donut :-(

BigDaddyLoveHandlesa at 2007-7-28 15:55:21 >