拆分坐标从文件Java读入

Question

I'm having trouble splitting a line read in from a txt file in to two points. The file has a list of coordinates like this:

(0, 0) (1, 2)
(0, 1) (-3, 4)
....

What I'm trying to do is separate them into two separate points so that I can calculate the distance between them. The issue I have is splitting them into the points after that I think I have everything correct. Any help would be greatly appreciated.

Here's my code:

public static void main(String[] args) {

    File file = new File(args[0]);
    BufferedReader br;
    try {
        br = new BufferedReader(new FileReader(file));
        String line;
        String point1, point2;
        int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
        while((line = br.readLine()) != null) {
            point1 = line.substring(0, line.indexOf(")"));
            point2 = line.substring(line.indexOf(")"), line.length());

            x1 = Integer.parseInt(point1.substring(1, point1.indexOf(",")));
            y1 = Integer.parseInt(point1.substring(point1.indexOf(",") + 2, point1.length() - 1));

            x2 = Integer.parseInt(point2.substring(2, point2.indexOf(",")));
            y2 = Integer.parseInt(point1.substring(point2.indexOf(",") + 2, point2.length() - 1));

            double distance = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
            System.out.println((int)distance);
        }
        System.exit(0);
    } catch(IOException e) {
        e.printStackTrace();
        System.exit(-1);
    }

}

Answer 1

You can try something like this I think. Not very efficient algorithm though.

public class Main {
public static void main(String[] args) {
    String s = "(0, 0) (1, 2)";
    String[] rawCoords = s.split("\\) \\(");
    Point p1 = parsePoint(rawCoords[0]);
    Point p2 = parsePoint(rawCoords[1]);
    System.out.println(p1.distance(p2));

}

private static Point parsePoint(String s) {
    //remove all brackets and white spaces and split by comma
    String[] rawXY = s.replaceAll("[\\)\\(\\s]", "").split(",");
    return new Point(Integer.parseInt(rawXY[0]), Integer.parseInt(rawXY[1]));
}

public static class Point {
    private final int x;
    private final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public double distance(Point another) {
        return Math.sqrt(Math.pow(x - another.x, 2) + Math.pow(y - another.y, 2));
    }

    @Override
    public String toString() {
        return "Point{" +
                "x=" + x +
                ", y=" + y +
                '}';
    }
}

}

Answer 2

You could use Tokenizer

(From the API) The string tokenizer class allows an application to break a string into tokens

Read more: http://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html