// generics/GenericArray.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

public class GenericArray<T> {

private T[] array;

@SuppressWarnings("unchecked")

public GenericArray(int sz) {

array = (T[])new Object[sz];

}

public void put(int index, T item) {

array[index] = item;

}

public T get(int index) { return array[index]; }

// Method that exposes the underlying representation:

public T[] rep() { return array; }

public static void main(String[] args) {

GenericArray<Integer> gai = new GenericArray<>(10);

try {

Integer[] ia = gai.rep();

} catch(ClassCastException e) {

System.out.println(e.getMessage());

}

// This is OK:

Object[] oa = gai.rep();

}

}

/* Output:

[Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer;

*/