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How do I access an array of objects inside of an array of objects?

my code: 

private boolean intersect(Polygon[] polygons, Line[] the_path, int i, int j)
{
   int k = 0;
   boolean intersect;

   if(intersect == true)
   {
       for(i = 0; i < polygons.length; i++)
        for(j = 0; j < polygons._lines.length; j++)
           for(k = 0; k < the_path.length; k++)
           intersect = polygons._lines[j].intersect(the_path[k]);
   } 

   return intersect;
}

The intersect method in the array of lines returns a boolean, but there is a separate array of line objects in each of the polygons....how do I go about accessing that method? (note..I don't know if this exact code will do what I want yet, but either way I need to be able to access that method)

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1 Answer

up vote 1 down vote

I think you accidentally left out the index into polygons (e.g. polygons[i]). Also, currently you have intersect being assigned the value of intersect() which means it is overwriting any other values given to the boolean intersect in previous loop iterations. I have added an if statement that will break out of the function immediately if that case if found instead. However, you could instead do something like intersect = intersect || ... .intersect() if you want to keep that variable.

Try this:

private boolean intersect(Polygon[] polygons, Line[] the_path, int i, int j) {
  int k = 0;

  for (i = 0; i < polygons.length; i++) {
    for (j = 0; j < polygons[i]._lines.length; j++) {
      for (k = 0; k < the_path.length; k++) {
        if (polygons[i]._lines[j].intersect(the_path[k])) {
          return true;
        }
      }
    }
  }

  return false;
}
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Thank you, that worked....how my only issue is figuring out where the null pointer exception is occurring and why -_- – user2489837 11 hours ago
@user2489837 - No problem, happy to help :). Perhaps if you post your null pointer exception call stack we can help debug your issue. – Aiias 11 hours ago

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