File handling deprecated method - which one?

Question

I have this code, it should basically use the lines of text in a file and use them to construct nodes in a JTree. The compilation error is that the class uses a deprecated method - so does anybody know what method is the problem and what I should use?
private void createNodes(DefaultMutableTreeNode top)
   DefaultMutableTreeNode anode = null; 
   File theFile = new File("categories.txt");
try
DataInputStream din1 = new DataInputStream(new FileInputStream(theFile));     
    //while (din1.available() !=0)
    while (true)
       String topic = din1.readLine().trim();
       //set the string as a tree node
       anode = new DefaultMutableTreeNode(topic);
       top.add(anode);
     din1.close();//close the file handle
     catch (Exception e)
          System.err.println("File input error");
}//end of method

Answer 1

If you compile with deprecation it will tell you specifically.
I think it is:
javac -deprecation ...
The only method from below that I think it could be is readLine() in DataInputStream...
If you are reading text...try:
BufferedReader br = new BufferedReader(new FileReader(theFile));
String topic;
while ((topic=br.readLine())!=null)
    anode = new DefaultMutableTreeNode(topic);
    top.add(anode);
br.close();