List

[adam Lui]

List<Integer> ls1 = new LinkedList(); //line 1
List<String> ls2 = new LinkedList(); //line 2
List ls3 = new LinkedList(); //line 3
List ls4 =ls1; //line 4
List ls5 =ls2; //line 5
List ls6=ls5=ls4; //line 6


which line(s) contains error?

[Ed Thompson]

List<Integer> ls1 = new LinkedList<Integer>(); //line 1
List<String> ls2 = new LinkedList<String>(); //line 2

[Sujatha Musunuri]

Hey Ed Thompson,

Do U say that the lines 1 & 2 give error? Can U let me know the cause?

[adam Lui]

i believe both curly bracket on ref and obj sides have to be the same.

but what the, what about line 6???
is it even legal?

[Ed Thompson]

I just plugged it into a class in Eclipse and let it complain.

The warning I got was a Type Safety warning:
"Type safety: The expression of type LinkedList needs unchecked conversion to conform to List<Integer>"

Beyond that I got no errors.

    public static void main(String[] args)
    {
    List<Integer> ls1 = new LinkedList(); //line 1
    List<String> ls2 = new LinkedList(); //line 2
    List ls3 = new LinkedList(); //line 3
    List ls4 =ls1; //line 4
    List ls5 =ls2; //line 5
    List ls6=ls5=ls4; //line 6
    System.out.println(ls6);
    }

[Burkhard Hassel]

Howdy,

all lines compile fine.

Only 1 and 2 will compile with a warning. Because you assigned a generic variable to a non-generic object. Allowed, compiles nicely, but you get a warning.


Yours,
Bu.