package series01;

public class StringArrayList {

	public String[] elements = new String[1];

	private int counter = 0;

	public boolean isEmpty() {
		return (counter == 0);
	}

	public int size() {
		return counter;
	}

	public String get(int index) {

		if (index >= counter || index < 0) {
			throw new IndexOutOfBoundsException("Fehler");
		}
		return elements[index];
	}

	public void add(String str) {

		if (counter == elements.length) {
			elements = Arrays.expandArray(elements);
		}

		elements[counter] = str;
		counter++;

	}

	public void add(int index, String e) {
		if (index > size() || index < 0) {
			throw new IndexOutOfBoundsException();
		}

		if (counter == elements.length) {
			elements = Arrays.expandArray(elements);
			// System.out.println("expand array");
		}
		if (index != size()) {
			elements = Arrays.shiftElements(elements, index);
		}

		elements[index] = e;

		counter++;

	}

	public void remove() {
		if (isEmpty())
			throw new IndexOutOfBoundsException("Liste ist leer");

		for (int i = 0; i < size()-1; i++) {
			elements[i] = elements[i + 1];

		}
		elements[size()] = null;
		counter--;

	}

}