cast Object to Comparable in java

Question

Here we have generic method:

public static <T extends Comparable<T>> T[] function(T[] a)
{
    Object[] m = new Object[2];

    /* some work here */

    return (T[]) m;
}

A ClassCastException is thrown . What's wrong with it?

Answer 1

An array of Object is not an array of any subclass of Object. You are facing one of the limitations of generics in Java: you cannot create a generic array. See this thread for an approach that does work.