MyArrayList

package arraylist.practice;

public class MyArrayList {

	static final int INITIAL_ARRAY_LENGHT = 10;
	private Integer[] container;
	private int nodeIndexToStoreData;

	public static void main(String[] args) {
		MyArrayList arrList = new MyArrayList();
		// Make sure add/get/resize function work
		arrList.add(1);
		arrList.add(2);
		arrList.add(3);
		arrList.add(4);
		arrList.add(5);
		arrList.add(6);
		arrList.add(7);
		arrList.add(8);
		arrList.add(9);
		arrList.add(10);
		arrList.add(11);
		
		System.out.println("Array List Size: " + arrList.size());
		System.out.println("Last Element: " + arrList.get(10));
		
		// TODO: add more test case

	}

	public MyArrayList() {
		this.container = new Integer[INITIAL_ARRAY_LENGHT];
		this.nodeIndexToStoreData = 0;
	}

	public void add(int n) {
		if (this.nodeIndexToStoreData == this.container.length - 1)
			this.increaseArrayListSize();

		this.container[this.nodeIndexToStoreData] = n;
		this.nodeIndexToStoreData++;
	}

	public Integer get(int index) {
		if (index > this.nodeIndexToStoreData - 1)
			throw new Error("[ERR] Out of index");

		return this.container[index];
	}

	public void set(int index, int n) {
		if (index > this.nodeIndexToStoreData - 1)
			throw new Error("[ERR] Out of index");
		this.container[index] = n;
	}

	public Integer remove(int index) {
		if (index > this.nodeIndexToStoreData - 1)
			throw new Error("[ERR] Out of index");
		int deletedValue = this.container[index];
		this.container[index] = null;
		return deletedValue;
	}

	public Integer size() {
		return this.nodeIndexToStoreData + 1;
	}

	private void increaseArrayListSize() {
		Integer[] copiedArray = this.container;
		this.container = new Integer[copiedArray.length + INITIAL_ARRAY_LENGHT];
		for (int i = 0; i < copiedArray.length; i++) {
			this.container[i] = copiedArray[i];
		}
	}

}