CODEWITHSUNDEEP
javafilejava.util.scanner
Matt Games
Matt Games

Reputation: 43

Why does this Scanner error when trying to read delimiter? How do I seperate only between words?

So I am trying to get them separated but for some reason I need to add exclamations at the end which works but in the real world isn't how it is usually formatted. How could I do this without adding exclamations at the end only between words? The text file reads: John!Smith!85! Matthew!Smith!82! The code is as follows: '''

package cmpsci111;
import java.util.*;
import java.io.*;
/**
 *
 * @author Matt
 */
public class Files2 {
    public static void main(String[] args) throws IOException{
        File f = new File("scores.txt");
        String firstname = "";
        String lastname = "";
        int score = 0;
        Scanner input = new Scanner(f);
        while(input.hasNextLine()){
            input.useDelimiter("!");
            firstname = input.next();
            lastname=input.next();
            score = input.nextInt();
            System.out.println(firstname+ " "+ lastname + " " + score);
        }
        input.close();
        
    }
}

'''

Upvotes: 0

Views: 38

Answers (1)

Evaldas
Evaldas

Reputation: 11

useDelimiter can accept regular expression as argument. "!|\r\n|\n|\r" can be used to separate by ! or line ending symbols. Text file can look like:

John!Smith!85
Matthew!Smith!82

Modified main method:

public static void main(String[] args) throws IOException{
    File f = new File("scores.txt");
    String firstname = "";
    String lastname = "";
    int score = 0;

    Scanner input = new Scanner(f);
    input.useDelimiter("!|\r\n|\n|\r"); //Before while loop


    while(input.hasNextLine()){
        //input.useDelimiter("!"); // No need  
        firstname = input.next();
        lastname=input.next();
        score = input.nextInt();
        System.out.println(firstname+ " "+ lastname + " " + score);
    }
    input.close();

}

Upvotes: 1

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