import java.lang.reflect.Array;

public class EnlargeArray<T> {
        /**
         * Just for demo
         *
         * @param args The command line args
         */
        public static void main(String[] args) {
                Integer[] myArray = { 1, 2, 3, 4 };
                // Show original
                System.out.println(java.util.Arrays.toString(myArray));
                // Enlarge it twofold
                myArray = EnlargeArray.doubleSize(myArray);

                for(int i = 0;i < myArray.length;i++) {      
                    myArray[i] = i + 1;
                }

                System.out.println(java.util.Arrays.toString(myArray));
        }

        /**
         * Double the size of a generic array
         *
         * @param <T> The array element type
         * @param original The original array
         *
         * @return The new array, doubled in size
         */
        public static <T> T[] doubleSize(T[] original) {
            T[] result = (T[]) Array.newInstance(original[0].getClass(), original.length * 2);
            System.arraycopy(original, 0, result, 0, original.length);
            return result;
        }
}