Warnings with Collections API

[Reema Patel]

Hello All,
Pls. consider the following code:

    List titles=new ArrayList();
titles.add("A");
 

I get a warning when i compile tgis code snippet. I compiled it with -Xlint:unchecked, and I get to see the following warning:

[unchecked] unchecked call to add(E) as a member of the raw type java.util.List

What does this mean? How can i remove the warning?

Any help shall be highly appreciated.

Thanks,
Reema

[Ernest Friedman-Hill]

Java 5 introduced "generics", which provides a way to make collections that are "typesafe". You can read about it here.

Short answer: this code

List<String> titles=new ArrayList<String>();
titles.add("A");

will not give the warning. Read the document linked to above to start to learn why.

[Reema Patel]

Thanks for the post!