Reading integer and coordinate from a text file in JAVA

Question

the code I am currently trying:

public static void main(String[] args) throws IOException {

    String content = new Scanner(new File("test/input_file.txt")).useDelimiter("\\z").next();
    System.out.println(content);
    String room = content.substring(0,3);
    System.out.println("room size:");
    System.out.println(room);

}

I want to read each data line of data, and be able to use them, eg. the first line is 10, I want to be able to create a variable to store it, but if the first line is 9, my code would not be working since I am using the substring.

So, How can I read the file, and put the data in multiple variables? such as I want to read the first line and store it in a variable named room, read the second line, and store it as firstcoordinate_x, and firstcoordinate_y.

Why do you need to take a substring if the line is just one thing anyway? — DarkHorse
– DarkHorse, Commented Dec 3, 2016 at 22:41
if I don't use substring, how can I get the data in the first line? — Zhou
– Zhou, Commented Dec 3, 2016 at 22:46
Welcome to Stack Overflow! It looks like you are asking for homework help. While we have no issues with that per se, please observe these dos and don'ts, and edit your question accordingly. — Joe C
– Joe C, Commented Dec 3, 2016 at 22:51

Eric Duminil · Accepted Answer · 2016-12-03 23:06:00Z

1

Here's an example for the first two lines :

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


public class ParseFile
{
    public static void main(String[] args) throws FileNotFoundException {
        Scanner scanner = new Scanner(new File("input_file.txt"));

        int roomSize = Integer.valueOf(scanner.nextLine());
        System.out.println("room size:");
        System.out.println(roomSize);

        String first_xy = scanner.nextLine();
        String[] xy = first_xy.replaceAll("\\(|\\)", "").split(",");
        int x1 = Integer.valueOf(xy[0]);
        int y1 = Integer.valueOf(xy[1]);

        System.out.println("X1:");
        System.out.println(x1);
        System.out.println("Y1:");
        System.out.println(y1);

        scanner.close();
    }
}

edited Dec 3, 2016 at 23:06

answered Dec 3, 2016 at 23:00

Eric Duminil

54.6k10 gold badges80 silver badges134 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Reading integer and coordinate from a text file in JAVA

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related