hi i want read special line of file. what am i doing ? I write a code but is false in this programm i want make tree with java but i should read data from file. please help me!

 void maketree(BtNode root,int i) throws FileNotFoundException, IOException{
       FileInputStream fis=new FileInputStream("D:/myfile.txt");
       DataInputStream dis=new DataInputStream(fis);
       BufferedReader br= new BufferedReader(new InputStreamReader(dis));
       String str[] = new String[130];
       BsTree bs = new BsTree();
       int index1=0;
       int p=0;
       String word1=null;
       String mean1=null;
       String n=null;

       BtNode t=root;

             if(i%2==0){
            index1=str[i].indexOf("=");
             System.out.println("index1:"+index1);
            word1=str[i].substring(0, index1);
             System.out.println("word1:"+word1);
             mean1 =str[i].substring(index1+1,str[i].length());
              System.out.println("mean1:"+mean1);
             BtNode newnode=bs.creatnode(word1, mean1, null,null);
            int s=word1.length();
             System.out.println("s:"+s);
            int s2=root.element1.length();
           System.out.println("root.element1"+ root.element1);
            System.out.println("s2:"+s2);
          if(s<s2)
              p=s;
            else
              p=s2;
            System.out.println("p:"+p);
            int sum=0,sum2=0;
            for(int j=0;j<p;j++){
            int c1=word1.codePointAt(j);
            sum+=c1;
            int c2=root.element1.codePointAt(j);
            sum2+=c2;
            }
            if(sum<sum2){

                 root.setleft(newnode);
                 System.out.println("root.left.element1:"+root.left.element1);
               //word1=root.left.element1;
               //mean1=root.left.element2;
            }else{
                root.setright(newnode);
                 System.out.println("root.right.element1:"+root.right.element1);
                //BtNode rigt=bs.creatnode(word1, mean1, null,null);
//                BtNode rigt=root.right;
                // word1=root.right.element1;
                 //mean1=root.right.element2;
            }
            maketree(newnode,i++);
              //n= word1;
              //n=st;
         }
     }
protected BtNode creatnode(String element1,String element2,BtNode left,BtNode right){
        return new BtNode(element1, element2, left,right);
    }