Here is a code that checks whether the given file exists or not. If file exists,then the code will display the data. Otherwise, it will allow the user to enter title's name and write it to the file. We have used FileInputStream and FileOutputStream for I/O operations.

import java.io.*;

class DisplayBook {
    public static void main(String[] args) 
    {
        int ch;
        try{
        File f=new File("c:/b.txt");
        if(f.exists()){
        StringBuffer buffer=new StringBuffer("");
        FileInputStream fis=new FileInputStream(f);
        while ((ch = fis.read()) != -1){
         buffer.append((char) ch);
        }
        System.out.println(buffer.toString());
        fis.close();
        }
        else{
            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
            System.out.print("Enter Title: ");
            String str=br.readLine();
            FileOutputStream fos=new FileOutputStream(f);
            byte buf[] = str.getBytes();
            for (int i=0; i < buf.length; i += 2) {
             fos.write(buf[i]);
            } 
            fos.close();
        }
       }
        catch(Exception e){
        System.out.println(e);
        }
    }
}