copy

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class CopyCollection {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Collection collection = java.util.Arrays.asList("asdf",
            "java");
    System.out.println(copy(collection));
}
public static <T> List<T> copy(Collection<T> collection) {
    @SuppressWarnings("unchecked")
    List<T> ret = (List<T>) provideListFor(Object.class);
    ret.addAll(collection);
    return ret;
}

public static <T> List<T> provideListFor(Class<T> c) {
    return new ArrayList<T>();
}

}
Console：[asdf, java]