Nrthugu

I need to make a program where I got an input file then make a graph of it and check if it's connected.

For example (the input file):
R - root
L - leafs (can be G - green or B - brown)
N - nuts (R - ripe or U - unripe)

1;R;2;3

2;R;4

3;L;G

4;N;U

And the output file should be:

if the tree is connected

S: Connected

L;Z;1
L;H;0
O;Z;0
O;N;1

if the tree is not connected

S: Not Connected

This is what I got so far

public class Main {

    public static void main(String args) throws IOException {

        FileReader fileReader = null;

        try {

            fileReader = new FileReader("input.txt");

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        }

        BufferedReader bufferedReader = new BufferedReader(fileReader);

        String strLine = bufferedReader.readLine();

//        Repeat until there's no more lines to read

        while (strLine != null) {

            String values = strLine.split(";");

            Tree treeId = new Tree(values[0]);

            Tree next = new Tree(values[1]);

Tree.class

 public class Tree {

          String data = null;

          public Tree(String data) {

               this.data = data;

          }

Please help me.