I tried to create a Java class to test as below:

public class ModifyArrayList<D> extends ArrayList<D> {

    public D getModIndex(int index) {
        int validIndex = Math.abs(index) % this.size();
        return this.get(validIndex);
    }
}

When I call this using the main method I get a warning ‘Raw use of parameterized class‘:

ModifyArrayList testList = new ModifyArrayList();
testList.add(0,1);
testList.add(1,2);
testList.add(2,3);
testList.add(3,4);

System.out.println(testList.getModIndex(1));
System.out.println(testList.getModIndex(-2));
System.out.println(testList.getModIndex(40));

What can I do about this?

I was trying to create class ModifyArrayList to handle invalid indexes used to retrieve data from ArrayList class objects. The expected output is generated but I still see the warning.