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;
	}
}