tree map help

I have written the code below, but now i am compleatly stuck!! i need to change this code to read in a name from the user then search the treemap for that name and return that name.
The names are stored in a txt file like:
john anderson:0123456322
jim collet:0176849323
Is it possible to put these names and number in the tree map, and have name as a key and number as a value, then search the treemap?? pls help!!

Code:

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class Treemap { 
  public static void main(String[] args) {   
    Map phoneBook = new TreeMap();   
    BufferedReader in = new BufferedReader(new FileReader("directory.txt"));   
    String line;   
    while ((line = in.readLine()) != null) {       
      String line = in.readLine();           
      int pos = line.indexOf (":");      //So use String.substring to get the parts of the line.         
      String name = line.substring (0, pos);           
      String number = line.substring (pos + 1);
      phoneBook.put (name, number);

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[ArchAngel adjusted text in CODE tags so that it's not all on one line]

I'm confused. What's the problem? You've already populated the Map with the data from the file.