从文件Java读取的拆分坐标

Question

我在将从txt文件读取的一行拆分为两点时遇到问题。该文件有一个坐标列表，如下所示：

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

我想做的是把它们分成两个独立的点，这样我就可以计算它们之间的距离。我的问题是把它们分成几点，然后我想我什么都对了。如有任何帮助，我们将不胜感激。

这是我的代码：

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

我想你可以试试这样的东西。虽然不是很有效的算法。

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

您可以使用Tokenizer

（来自API）字符串标记器类允许应用程序将字符串分解为标记

阅读更多：http://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html