how to use generics with comparable

[Jeanne Boyarsky]

I have a utility method that looks like this from Java 1.4 code. How do I get it to use generics? Or should I be using the suppression option if there is not a way?

public static void myMethod(String message,
            Comparable<>[] one, Comparable[] two) {
   
    for (int i = 0; i < one.length; i++) {
           System.out.println(one[i].compareTo(two[i]));
    }
}

[Sebastian Janisch]

If you parameterize Comparable you'll run into another problem because the compiler will warn you not to use Generic types in correlation with Arrays ...

[pete stein]

What about...

  public static <T extends Comparable  <T>> void myMethod(String message, T[] one,
      T[] two) {

    for (int i = 0; i < one.length; i++) {
      System.out.println(one[i].compareTo(two[i]));
    }

  }

edit: the forum software is messing up. The forum signature should read: <T extends Comparable <T>>

For a more in-depth tutorial on generics than the standard Sun tutorials have to offer, please look here: generics-tutorial

[Rob Spoor]

pete stein wrote:edit: the forum software is messing up. The forum signature should read: <T extends Comparable <T>>

Actually, just to be safe, it should be <T extends Comparable<? super T>> - this allows you to use interfaces like ScheduledFuture - which implements Comparable<Delayed> because it inherits that from Delayed.

[Jeanne Boyarsky]

That makes sense. Thanks guys. I was focused on generics, I didn't think about the other "new" features.

[pete stein]

Rob Prime wrote:Actually, just to be safe, it should be ...

Thanks for the correction and the education!