How do you Read from a text file?

Question

For some reason this is not working, I'm quite new to java so I am probably being naive.

public class CheckScore extends quiz{
    public void CheckScore() {
        String filename = "Data_CS";{

        try (BufferedReader br = new BufferedReader(new FileReader(filename))){
            String line;
            while ((line = br.readLine()) == "potato") {
                System.out.print("vde");
                System.out.print(line);
            }
            } 
         catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
         catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
       }        
    }
}

use `(line = br.readLine()).equals("potato")` if it only read the file if the content of the line is potato. normally you use `(line = br.readLine()) !=null` — XtremeBaumer, Apr 26 '17 at 12:53
Please try to be more specific with your question; read: http://stackoverflow.com/help/how-to-ask — Florian Moser, Apr 26 '17 at 13:00

score 0 · Answer 1 · answered Apr 26 '17 at 12:55

0

You are using the wrong equals.

== means are the instances that these variables represent the same.

.equals(value) means are the values that these variables hold equal.

Hope the explanation helped you.

answered Apr 26 '17 at 12:55

Just a quick add on, would you know how for the program to print the like below it as well – Ali Farouk Apr 26 '17 at 13:21

score 0 · Answer 2 · answered Apr 26 '17 at 12:57

0

With string you can use '==' So you can use this :

 line=br.readLine();
 while ((line.equals("potato")) {
            System.out.print("vde");
            System.out.print(line);
            line=br.readLine();
        }

answered Apr 26 '17 at 12:57

N.Jourdan

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thank you, it works – Ali Farouk Apr 26 '17 at 13:02
Good :D If it's work you can accept to show the solution to the others :) – N.Jourdan Apr 26 '17 at 13:08

How do you Read from a text file?

2 Answers2