基于对象类在Java中覆盖打印语句

Question

我有以下Java代码

我能够以printDistance方法打印计算出的值。

输出：

4.0

3.0

但是我需要以下格式的输出（预期输出）。请帮助

3D距离= 4.0

2D距离= 3.0

 public class Point2D {

    double x;
    double y;

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    public Point2D(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public double dist2D(Point2D p) {
        x = (int) Math.ceil(Math.sqrt(Math.pow((p.getX() - x), 2) + Math.pow((p.getY() - y), 2)));
        return x;
    }

    public static void printDistance(double d) {
        System.out.println(d);
    }

    static public void main(String args[]) {
        Point3D obj1 = new Point3D(1.0, 2.0, 3.0);
        Point3D obj2 = new Point3D(3.0, 4.0,5.0);
        printDistance(obj1.dist3D(obj2));
        printDistance(obj1.dist2D(obj2));
    }
}

class Point3D extends Point2D {

    double z;

    public double getZ() {
        return z;
    }

    public Point3D(double x, double y, double z) {
        super(x, y);
        this.z = z;
    }

    public double dist3D(Point3D p) {
        return (int) Math.ceil(Math.sqrt(Math.pow((p.getX() - x), 2) + Math.pow((p.getY() - y), 2) + +Math.pow((p.getZ() - z), 2)));
    }
}

Answer 1

您可以执行以下操作：

public class Point2D {

    double x;
    double y;

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    public Point2D(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public String dist2D(Point2D p) {
        x = (int) Math.ceil(Math.sqrt(Math.pow((p.getX() - x), 2) + Math.pow((p.getY() - y), 2)));
        return "2D Distance = "+x;
    }

    public static void printDistance(String d) {
        System.out.println(d);
    }

    static public void main(String args[]) {
        Point3D obj1 = new Point3D(1.0, 2.0, 3.0);
        Point3D obj2 = new Point3D(3.0, 4.0,5.0);
        printDistance(obj1.dist3D(obj2));
        printDistance(obj1.dist2D(obj2));
    }
}

class Point3D extends Point2D {

    double z;

    public double getZ() {
        return z;
    }

    public Point3D(double x, double y, double z) {
        super(x, y);
        this.z = z;
    }

    public String dist3D(Point3D p) {
        return  "3D Distance = "+ Math.ceil(Math.sqrt(Math.pow((p.getX() - x), 2) + Math.pow((p.getY() - y), 2) + +Math.pow((p.getZ() - z), 2)));
    }
}

输出：

3D Distance = 4.0
2D Distance = 3.0