public class Vector {
	private Object[] array;
	private int size = 0;
	
	public Vector() {
		 array = new Object[100];
	}
	
	public Vector (int size) {
		 array = new Object[size];
	}
	
	private void increaseCapacity() {
		int oldSize = array.length;
		Object newArray[] = new Object[2*oldSize];
		for ( int i = 0; i < oldSize; i++ )
			newArray[i] = array[i];
		array = newArray;
	}
	
	public void add (Object o) {
		if ( size == array.length )
			increaseCapacity();
		array[size++] = o;
	}

	public Object remove (int which) {
		Object ret = array[which];
		for ( int i = which; i < array.length-1; i++ )
			array[i] = array[i+1];
		array[array.length-1] = null;
		size--;
		return ret;
	}
	
	public int size() {
		return size;
	}
	
	public Object get (int which) {
		return array[which];
	}
	
	public String toString() {
		String ret = "[";
		for ( int i = 0; i < size; i++ ) {
			ret += array[i];
			if ( i != size-1 )
				ret += ", ";
		}
		ret += "]";
		return ret;
	}
	
}