Thread: Add objects to the neighbors list

I have a java exercise follow: there are n machines of 3 type A,B,C, each machine has coordinates (x,y) and operate radius, with data get from a XML file, for instance:

<machine>
<number ="1">
  <type>C</type> 
  <cox>40</cox>
  <coy>80</coy>
  <rad>30</rad>
</number>
<number ="2">
  <type>A</type>
  <cox>25</cox>
  <coy>35</coy>
  <rad>40</rad>
</number>
<number ="3">
  <type>C</type>
  <cox>50</cox>
  <coy>10</coy>
  <rad>50</rad>
</number>
</machine>

I made 3 class A, B, C and already got information from xml file. But the 2 problems is that:

1. calculate the distance between each machine

2. add them to list of each machine if distance is less than radius.

I known the formula to calculate the distance but dont know how to get x, y to calculate nx(n-1) distances, and add them to list. Could anyone give me the idea to solve these 2 problems? Thank so much!

when you meant you got the information from xml file it contains x and y co-ordinates as well as child nodes. Then you have them as well for your calculation. Are you not sure of how to parse xml is that these question here??

Thank dineshj, i have done the first job (calculate the distance between each machine), my main question is how to add the neighbor machines to the list of each object. I think solution about add attribute List to the 3 class A, B, C (using arraylist). Then, when read from the xml, it will show the neighbor list of each object. I m coding now but not yet done.