1	
     2	public class Main {
     3		public static void main(String[] args) {
     4			Main main = new Main();
     5			main.setReadOnly(false);
     6			main.add(main);
     7		}
     8	
     9		private boolean readOnly;
    10		private int size = 0;
    11		private Object[] elements = new Object[1];
    12		public void add(Object element){
    13			if(!readOnly){
    14				int newSize = size  + 1;
    15				if(newSize > elements.length){
    16					Object[] newElements = new Object[elements.length+10];
    17					for(int i = 0;i < size; i++)
    18						newElements[i] = elements[i];
    19					elements = newElements;
    20				}
    21				elements[size++] = elements;
    22			}
    23		}
    24		public void setReadOnly(boolean readOnly) {
    25			this.readOnly = readOnly;
    26		}
    27	
    28	}