Convert a generic list to an array

Question

I have searched for this, but unfortunately, I don\'t get the correct answer.

class Helper {
    public static  T[] toArray(List list) {
           


        

Answer 1

I use this simply function. IntelliJ just hates that type cast T[] but it works just fine.

public static  T[] fromCollection(Class c, Collection collection) {
    return collection.toArray((T[])java.lang.reflect.Array.newInstance(c, collection.size()));
}

And call looks like this:

Collection col = new ArrayList(Arrays.asList(1,2,3,4));    
fromCollection(Integer.class, col);