Hello, recently I'm writing some functions that I take from Haskell and translate into Java.
One of the main
problems I have is I cannot easily create a static property with a generic type. Let me explain by a little example...
// An interface to implement functions
public interface Func<P, R> {
public R apply(P p);
}
// What I want to do... (incorrect in Java)
public class ... {
public static <T> Func<T, T> identity = new Func<T, T>() {
public T apply(T p) { return p; }
}
}
// What I do right now
public class ... {
private static Func<Object, Object> identity = new Func<Object, Object>() {
public Object apply(Object p) { return p; }
}
@SuppressWarnings("unchecked")
public static <T> Func<T, T> getIdentity() {
return (Func<T, T>)identity;
}
}
Are there any easier ways to do something like that?
What kind of
problems might arise if the syntax I used would be valid?
