如何从 main 方法调用第一个区域方法？

Question

我需要包含圆面积公式的面积方法来获取由计算距离的其他面积方法找到的半径......因此，其中一种面积方法计算了距离/半径我希望该答案用于圆面积的面积方法的半径。

public class AreaCircle {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    Scanner reader = new Scanner (System.in);

    double x1, x2, y1, y2, xc, yc;

    System.out.println("x1: ");
        x1 = reader.nextInt();
    System.out.println("x2: ");
        x2 = reader.nextInt();
    System.out.println("y1: ");
        y1 = reader.nextInt();
    System.out.println("y2: ");
        y2 = reader.nextInt();

    double distance = area(x1, x2, y1, y2);
    System.out.println("The radius of the circle is: ");
    System.out.println(distance);

    double answer = area(distance);
    System.out.println("The area of the circle is: ");
    System.out.println(answer);


}

public static double area (double distance) {
    double areaCircle;
    double powRadius;
    double radius = distance;


    powRadius = Math.pow(radius, 2);
    areaCircle = (Math.PI *(powRadius));
    return areaCircle;


}
public static double area (double x1, double x2, double y1, double y2) {
    double dx = x2 - x1;
    double dy = y2 - y1;
    double dsquared = dx*dx + dy*dy;
    double distance = Math.sqrt (dsquared);
    return distance;
}

Answer 1

你要做的是给你的area()方法一个输入变量，即半径

像这样：

public static double area(double radius) {
    //same as before
    double areaCircle;
    double powRadius;

    powRadius = Math.pow(radius, 2);
    areaCircle = (Math.PI *(powRadius));
    return areaCircle;

}

同时重命名您的其他 area() 方法。照原样，它应该被称为returnDistance。