private void ensureSize(){
  if (children == EMPTY_CHILDREN) {
    children=new FPNode[1];
    return;
  }
  int newsize=children.length == 1 ? INITIAL_SIZE : (children.length << 1);
  children=Arrays.copyOf(children,newsize);
}

private void ensureSize ( ) { if ( children == EMPTY_CHILDREN ) { children = new FPNode [ 1 ] ; return ; } int newsize = children . length == 1 ? INITIAL_SIZE : ( children . length << 1 ) ; children = Arrays . copyOf ( children , newsize ) ; }
ensure we have enough storage .
