Question

Computer Science - Java Programming

How do you read a text file and store three different pieces of information in the database when the given text file contains this info.:

12345 Computer Science Bob Stone

23456 Art James G. Ocean?

These are written in the format as

ID Class Name.

I was going to take the three different pieces of information by separating them by spaces, but the number of spaces is random and I don't know how to adjust it accordingly.

How should I do this? Is it even possible?

Answer 1

Answer:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;

public class FileReader {

   public static void main(String[] args) {
       try {
           // creating file object here
           File fileObj = new File("test-data.txt");
          
           // creating scanner object to read file line by line
           Scanner scanner = new Scanner(fileObj);

           // priting header line of table
           System.out.format("%6s| %10s| %16s", "Id", "Class", "Name");
           System.out.println("\n--------------------------------------");

           // iteratng while to read file data
           while (scanner.hasNextLine()) {
              
               // reading line
               String line = scanner.nextLine();
              
               // spliting line by providing regex and limit to split function
               // "\\s" is regex for whitespace and 3 is limit, so this split the string upto 3 whitespaces
               String data[] = line.split("\\s", 3);
              
               // printng a data into table format using format spacifier
               System.out.format("%6s| %10s| %16s", data[0], data[1], data[2]);
               System.out.println("");
           }
          
           // closing scanner object
           scanner.close();
          
       } catch (FileNotFoundException e) {
           System.out.println("An error occurred.");
           e.printStackTrace();
       }

   }

}

Output: