java How to load in a string value

Question

Hello I have an application that loads in values. The values are x,y,and a string value. I want to know how to load in a string because I only know how to o it with an integer. Take a look at this code:

    public static void loadStars() {
    try {
        BufferedReader bf = new BufferedReader(new FileReader   ("files/cards.txt"));
        for (int i = 0; i < 10; i++) {
            String line;
            while ((line = bf.readLine()) != null) {

                String[] args = line.split(" ");

                int x = Integer.parseInt(args[0]);
                int y = Integer.parseInt(args[1]);
                String name = Integer.parseInt(args[2]);

                play.s.add(new Star(x,y,name));


            }
        }

        bf.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

I have

play.s.add(new star(x,y,name));

I know how to load in x and y but I don't know how to load in name. Please help me.

Edit----

In the file that is loaded in it is formatted like this:

x y name

example:

10 10 jack
100 500 conor

each star is represented by 1 line.

public class Star extends BasicStar {

    private Image img;

    public Star(int x, int y,String starname) {
        this.x = x;
        this.y = y;
        this.starname = starname;

        r = new Rectangle(x, y, 3, 3);
    }

    public void tick() {

        if (r.contains(Comp.mx, Comp.my) && Comp.ml) {
            remove = true;
        }
    }

    public void render(Graphics g) {
        if (!displaySolar) {

            ImageIcon i2 = new ImageIcon("res/planets/star.png");
            img = i2.getImage();
            g.drawImage(img, x, y, null);
        }
    }
}

Kiki · Accepted Answer · 2015-07-03 10:01:47Z

5

Array args[] is already String so you just need to change

String name = Integer.parseInt(args[2]);

to

String name = args[2];

And that's it.

answered Jul 3, 2015 at 10:01

Kiki

2,2515 gold badges34 silver badges44 bronze badges

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

8 Comments

Kiki Over a year ago

@user3929251 So play.s is List<Star>?

user3929251 Over a year ago

it is ArrayList(star)

user3929251 Over a year ago

the problem with this is that it only uses the name from the last line in the file so when I run it all the stars have the name of the star at the last line in the file for example

user3929251 Over a year ago

10 10 jack (nextline) 20 50 connor , all of the stars have the name connor

Kiki Over a year ago

Show the constructor for Star object.

|

Sandeep · Accepted Answer · 2015-07-03 10:10:59Z

Try this.

public static void loadStars() {
        try {
            BufferedReader bf = new BufferedReader(new FileReader   ("files/cards.txt"));
            for (int i = 0; i < 10; i++) {
                String line;
                while ((line = bf.readLine()) != null) {

                    String[] args = line.split(" ");

                    int x = Integer.parseInt(args[0]);
                    int y = Integer.parseInt(args[1]);
                    String name = args[2]; // args array contain string, no need of conversion.

                    play.s.add(new Star(x,y,name));


                }
            }

        bf.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Michele · Accepted Answer · 2015-07-03 10:11:36Z

you improve your code by using a StringTokenizer. Try This.

    public static void loadStars()
        throws IOException {
    String line;
    BufferedReader bf = new BufferedReader(new FileReader   ("files/cards.txt"));
    try
    {
    while((line = bf.readLine()) != null)
    {
        if (line == null || line.trim().isEmpty())
            throw new IllegalArgumentException(
                    "Line null!");

        StringTokenizer tokenizer = new StringTokenizer(line, " ");
        if (tokenizer.countTokens() < 3)
            throw new IllegalArgumentException(
                    "Token number not valid (<= 3)");
        int x, y;
        String xx = tokenizer.nextToken(" ").trim();
        String yy = tokenizer.nextToken(" ").trim();
        String name = tokenizer.nextToken(" ").trim();
        try
        {
        x = Integer.parseInt(xx);
        }catch(ParseException e){throw new IllegalArgumentException(
                "Number format not valid!");}
        try
        {
        y = Integer.parseInt(yy);
        }catch(ParseException e){throw new IllegalArgumentException(
                "Number format not valid!");}
        play.s.add(new Star(x,y,name));
    }
    } catch (NoSuchElementException | NumberFormatException | ParseException e) {
        throw new IllegalArgumentException(e);
    }
}

Rodolfo · Accepted Answer · 2015-07-03 10:28:21Z

0

Array args[] is already String so you just need to change

String name = Integer.parseInt(args[2]);

// If you are using this values anywhere else you'd do this so de GC can collects the arg[] array
String name = new String(args[2]);

Be aware that if you have spaces in string arguments each word will be a new argument. If you have a call like:

java -jar MyProgram 1 2 This is a sentence.

Your arg[] will be:

{"1", "2", "This", "is", "a", "sentence."}

If you need the sentence to be one String you should use apostrophes:

java -jar MyProgram 1 2 "This is a sentence."

Your arg[] will be:

{"1", "2", "This is a sentence."}

answered Jul 3, 2015 at 10:28

Rodolfo

1,2014 gold badges17 silver badges41 bronze badges

Collectives™ on Stack Overflow

java How to load in a string value

4 Answers 4

8 Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

8 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related