Question

I have following class hierarchy:

public abstract class Property<T>
{
    private long id;
    private String name;
    private T value;

    /*setters and getters*/
}

public class NumberProperty extends Property<Integer>

public class TextProperty extends Property<String>

…and a class containing List<Property> properties. I get “Property is raw type. References to generic type Property<T> should be parametrized“. I know why, but I want to have one list of properties of few, known types (Property cannot be instatiated as it is abstract class).

My question is: can I ignore the warning or should I change my code (how?) ?

Answer 1

Use Property<?> if you don’t care about which type of object it is this will instruct the compiler that you know what you are doing.

List<Property<?>> list;