Lookup.java in a program

Lookup.java

public class Lookup

  {

    public static void main(String[] args)

       {

        In in = new In(args[0]);

        int keyField = Integer.parseInt(args[1]);

        int valField = Integer.parseInt(args[2]);

        String[] database = in.readAllLines();

        StdRandom.shuffle(database);

        BST st = new BST();

        for (int i = 0; i < database.length; i++)

        {

            String[] tokens = database[i].split(",");

            String key = tokens[keyField];

            String val = tokens[valField];

            st.put(key, val);

        }

        while (!StdIn.isEmpty())

        {

            String s = StdIn.readString();

            if (st.contains(s)) StdOut.println(st.get(s));

            else                StdOut.println("Not found");

        }

    }

}