如何在Java中使用带有数组的方法？

Question

我的第一个问题，所以请指出我的错误。老实说，我找不到任何类似的问题。

所以我试图写一些非常基本的东西，我真的不明白为什么我不能从我的主类的Util类调用一个方法。

Util类

    private double accumulatedArea;
    private double accumulatedCircumference;


    public static double getAccumulatedArea(Shape[] shapes) {
        double accumulatedArea = 0;
        for (Shape s : shapes) {
            accumulatedArea = accumulatedArea + s.area();
            return accumulatedArea;
        }
        return accumulatedArea;
    }


    public static double getAccumulatedCircumference(Shape[] shapes) {
        double accumulatedCircumference = 0;
        for (Shape q : shapes) {
            accumulatedCircumference = accumulatedCircumference + q.circumference();
            return accumulatedCircumference;
        }
        return accumulatedCircumference;
    }

    public String toString() {
        return "Number: ";
     }

}

主课呢

    public static void main(String[] args) {

        Shape[] shapes = new Shape[4];

        shapes[0] = new Circle(100);
        shapes[1] = new Circle(23);

        shapes[2] = new Rectangle(10, 20);
        shapes[3] = new Rectangle(8, 12);

        System.out.println("Area of the circle 1: " + shapes[0].area() + " and its circumference is: " + shapes[0].circumference());
        System.out.println("Area of the circle 2: " + shapes[1].area() + " and its circumference is: " + shapes[1].circumference());

        System.out.println("Area of the rectangle 1: " + shapes[2].area() + " and its circumference is: " + shapes[2].circumference());
        System.out.println("Area of the rectangle 2: " + shapes[3].area() + " and its circumference is: " + shapes[3].circumference());
        //Small test
        System.out.println("Number of shapes are in the system: " + shapes.length);

        //????? What to do here??
        for (int p = 0; p < shapes.length; p++) {
            Shape[p].getAccumulatedArea();
        }


    }
}

我如何调用我的GetAccumeratedArea和GetAccumeratedPercentage方法？？

我已经找了几天了，我真的不知道怎么找。

我用的是2个长方形，也就是2个长方形。它们非常相似，所以我只放一个。

    private double radius;
    private double circumference;
    private double area;
    private ArrayList<Circle> circles;


    //throws Exception gives error! learn how to do exceptions!
    public Circle(double radius) {
        super();
        if(radius > 0) {
            this.radius = radius;
        }
        else {
            System.out.println("Throw new Exception!!");
        }
    }

    public void setRadius(double radius) throws Exception {
        if (radius < 0) {
            throw new Exception();
        }
        else {
            this.radius = radius;
        }
    }
    public void setCircumference(double circumference) throws Exception {
        if (circumference < 0) {
            throw new Exception();
        }
        else {
            this.circumference = circumference;
        }
    }

    public void setArea(double area) {
        if (area <= 0) {
            System.out.println("Please check your input!");
        }
        else {
            this.area = area;
        }
    }

    public double getRadius() {
        return radius;
    }

    public double getCircumference() throws Exception{
        if (radius < 0) {
            throw new Exception();
        }
        else {
            return circumference;
        }
    }

    public double getArea() throws Exception{
        if (radius < 0) {
            throw new Exception();
        }
        else {
            return area;
        }
    }

    @Override
    public double circumference() {
        return 2 * Math.PI * radius;
    }

    @Override
    public double area() {
        return radius * radius * Math.PI;
    }
}

代码看起来有点混乱，但那是因为我一直在尝试一切：）欢迎任何建议。顺便说一句，我使用的是Arraylist，但据我认识的一些人说，在这种情况下使用Array要好得多。

Answer 1

您的Util类中的方法是静态。静态方法应该在它声明为其一部分的类上调用。您声明的两个方法都采用了类型Shape[]的参数。所以您应该像这样调用它们：

Util.getAccumulatedArea(shapes)

…其中shapes是Shape[]类型的值。