Question

I have defined 4 comparators for my object like this:

public static Comparator<mObject> comp0 = new Comparator<mObject>() {

        @Override
        public int compare(mObject l, mObject r) {
            ...compare
        }
    };

public static Comparator<mObject> comp1 = new Comparator<mObject>() {

        @Override
        public int compare(mObject l, mObject r) {
            ...compare
        }
    };

public static Comparator<mObject> comp2 = new Comparator<mObject>() {

        @Override
        public int compare(mObject l, mObject r) {
            ...compare
        }
    };

public static Comparator<mObject> comp4 = new Comparator<mObject>() {

        @Override
        public int compare(mObject l, mObject r) {
            ...compare
        }
    };

Now i want to create an array with the 4 comparators ,like this :

public final static Comparator<mObject>[] Object_comparators = { comp0,
        comp1,
        comp2,
        comp3};

but Eclipse underlines everything between {..} like it is an error .Why is it ,and how could i fix it ?

Answer 1

You cannot create an array of classes with a parameterized generic type.

If you don’t mind losing type safety, you can do this:

Comparator[] list = new Comparator[4];

But my preferred strategy would be to use a List:

List<Comparator<mObject>> list = Arrays.asList(comp0, comp1, comp2, comp3);