ArrayList Implementation

ArrayList.java

import java.util.Arrays;

/**
 * Simple ArrayList Implementation for Java Beginners
 * 
 * @author malalanayake
 * 
 */
public class ArrayList {
	private Object[] data;
	private int count = 0;
	private int FIXED_SIZE = 10;

	public ArrayList() {
		data = new Object[this.FIXED_SIZE];
	}

	/**
	 * Get the specific object
	 * 
	 * @param index
	 * @return
	 */
	public Object get(int index) {
		if (index < count) {
			return data[index];
		} else {
			throw new ArrayIndexOutOfBoundsException();
		}
	}

	/**
	 * Add new object to the array list
	 * 
	 * @param obj
	 */
	public void add(Object obj) {
		if (data.length - count <= data.length / 2) {
			this.reSizeArray();
		}

		data[count++] = obj;
	}

	/**
	 * Remove the object from list
	 * 
	 * @param index
	 * @return
	 */
	public Object remove(int index) {
		if (index < count) {
			Object obj = data[index];
			int temp = index;
			data[index] = null;

			while (temp < count) {
				data[temp] = data[temp + 1];
				data[temp + 1] = null;
				temp++;
			}

			count--;
			return obj;
		} else {
			throw new ArrayIndexOutOfBoundsException();
		}
	}

	/**
	 * Resizing the array
	 */
	public void reSizeArray() {
		data = Arrays.copyOf(data, data.length * 2);
	}

	public int size() {
		return count;
	}

	public static void main(String[] args) {
		ArrayList mal = new ArrayList();
		mal.add(new Integer(2));
		mal.add(new Integer(5));
		mal.add(new Integer(1));
		mal.add(new Integer(23));
		mal.add(new Integer(14));
		for (int i = 0; i < mal.size(); i++) {
			System.out.print(mal.get(i) + " ");
		}
		mal.add(new Integer(29));
		System.out.println("Element at position 5:" + mal.get(5));
		System.out.println("Total List size: " + mal.size());
		System.out.println("Removing element at position 2: " + mal.remove(2));
		for (int i = 0; i < mal.size(); i++) {
			System.out.print(mal.get(i) + " ");
		}
	}

}