is it ok to do this... and generics

[sparkles]

sorry about the subject - i'm not quite sure what it is i'm asking is called

is there anything wrong with doing this...?

ArrayList al = new ArrayList();
al.add(new MyClass(1, 2, 3, 4)); <-----

or is it better to do this?

ArrayList al = new ArrayList();
MyClass class = MyClass(1, 2, 3, 4);
al.add(class);

also if the arraylist is instantiated using generics as such

ArrayList<MyClass> al = new ArrayList<MyClass>();

does that mean that al.get() will return a MyClass or do i still have to
cast it?

TIA

 

[Lee Weiner]

sorry about the subject - i'm not quite sure what it is i'm asking is called

is there anything wrong with doing this...?

ArrayList al = new ArrayList();
al.add(new MyClass(1, 2, 3, 4)); <-----

or is it better to do this?

ArrayList al = new ArrayList();
MyClass class = MyClass(1, 2, 3, 4);
al.add(class);

It's called an anonymous object (there is no named variable referencing the
object), and, no, there's nothing wrong with it if you have no other use for
the "class" variable, IMO.

also if the arraylist is instantiated using generics as such

ArrayList<MyClass> al = new ArrayList<MyClass>();

does that mean that al.get() will return a MyClass or do i still have to
cast it?

al.get() will return a MyClass object. There's no need to cast.

Lee Weiner
lee AT leeweiner DOT org