为什么我的柜台不起作用？ Java的

I've tried running this, but printing out circleCounter only prints 0. If I were to put the counter code under the tester function in the bottom part, then it would work. What am I doing wrong? Am I missing out on something?

我试过运行这个,但打印出circleCounter只打印0.如果我将计数器代码放在底部的测试器功能下,那么它就可以了。我究竟做错了什么?我错过了什么吗?

public class Project1 {
    public int circleCounter; // Number of non-singular circles in the file.
    public int posFirstLast;  // Indicates whether the first and last circles overlap or not.
    public double maxArea;       // Area of the largest circle (by area).
    public double minArea;       // Area of the smallest circle (by area).
    public double averageArea;   // Average area of the circles.
    public double stdArea;       // Standard deviation of area of the circles.
    public double medArea;       // Median of the area.
    public int stamp = 189375;

    public Project1() {
        // This method is complete.
    }


    public void results(String fileName) {
        MaInput F1 = new MaInput("DataFile.data");
        double x, y, rad;
        int circleCounter = 0;
        double sumArea = 0;
        Circle A = new Circle();

        while (!F1.atEOF()) {
            x = F1.readDouble();
            y = F1.readDouble();
            rad = F1.readDouble();

            circleCounter++;

            if (A.area() > maxArea) {
                maxArea = A.area();
            }

            if (A.area() < minArea) {
                minArea = A.area();
            }

            sumArea += A.area();
            averageArea = sumArea / circleCounter;

            stdArea = Math.sqrt((Math.pow(A.area() - averageArea, 2) / circleCounter));

            //Array for points
            Circle[] points = new Circle[circleCounter];
            for (int j = 0; j < points.length; j++) {
                if (rad > Point.GEOMTOL) {
                    points[j] = A;
                }
            }

            posFirstLast = points[1].overlap(points[points.length]);

            //Array of areas
            double[] areas = new double[circleCounter];
            for (int i = 0; i < areas.length; i++) {
                if (rad > Point.GEOMTOL) {
                    areas[i] = A.area();
                }
            }

            //Bubble Sort
            for (int i = 0; i < areas.length; i++) {
                if (areas[i + 1] < areas[i]) {
                    double temp = areas[i + 1];
                    areas[i + 1] = areas[i];
                    areas[i] = temp;
                }
            }

            //Median
            if (areas.length % 2 == 0) {
                medArea = (0 / 5) * (areas[(areas.length / 2) - 1] + areas[areas.length / 2]);
            } else {
                medArea = (0.5) * (areas[((areas.length) - 1) / 2]);
            }

        }
    }

    public static void main(String args[]) {

        Project1 pleasework = new Project1();
        System.out.println("Number of (non-singular) circles: " + pleasework.circleCounter);
        System.out.println("Whether the first and last circles overlap: " + pleasework.posFirstLast);
        System.out.println("Maximum Area: " + pleasework.maxArea);
        System.out.println("Minimum Area: " + pleasework.minArea);
        System.out.println("Average Area: " + pleasework.averageArea);
        System.out.println("Standard deviation of the areas: " + pleasework.stdArea);
        System.out.println("Median of the areas: " + pleasework.medArea);
    }
}

2 个解决方案

#1

So, if it's only your circleCounter that's still giving you 0, then you should be aware of shadowing your variables.

所以,如果它只是你的circleCounter仍然给你0,那么你应该知道阴影你的变量。

private int circleCounter = 0; is applicable to the global scope.

private int circleCounter = 0;适用于全球范围。

int circleCounter = 0; is applicable to the scope local to your method results. The most local scope takes precedence with variables, so you've thus shadowed your global variable by redeclaring it here.

int circleCounter = 0;适用于方法结果的本地范围。最本地的范围优先于变量,因此您可以通过在此处重新声明它来遮蔽全局变量。

Simply take out that declaration and your variable won't be shadowed.

只需取出该声明,您的变量就不会被遮蔽。

Edit: This also presumes that you actually call the method, too.

编辑:这也假设您实际上也调用了该方法。

#2

The main in your code does not invoke the results() method and hence all the default values of the fields are printed on your console i.e either 0 or 0.0(for double) as main is the only entry point for java in your program.

代码中的main不调用results()方法,因此字段的所有默认值都打印在控制台上,即0或0.0(对于double),因为main是程序中java的唯一入口点。

#1