public void insert(ForceItem item){
  try {
    insert(item,root,xMin,yMin,xMax,yMax);
  }
 catch (  StackOverflowError e) {
    e.printStackTrace();
  }
}

public void insert ( ForceItem item ) { try { insert ( item , root , xMin , yMin , xMax , yMax ) ; } catch ( StackOverflowError e ) { e . printStackTrace ( ) ; } }
inserts an item into the quadtree .
