gistfile1.java

class ArrayList implments List{
  private Object[] buff = null;
  private int last = 0;
    public ArrayList(){ this(128); }
  public ArrayList(int n){
     buff = new Object[n];
  }

  public add(Object o ){ 
      if (last == buff.length) {
	  Object[] xs = new Object[buff.length * 2];
	  for(int i=0;i<buff.length;i++) xs[i] = buff[i];
	  buff = xs;
      }
      buff[last] = o; last++; 
  }
  public get(int n){return buff[n]}
}