Java 三维空间点类及距离计算：示例和代码

下面是用 Java 语言编写的 Point 类和 Point 的测试类：

Point 类：

public class Point {
    private double x;
    private double y;
    private double z;
    
    public Point() {
        this.x = 0;
        this.y = 0;
        this.z = 0;
    }
    
    public Point(double x, double y, double z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }
    
    public void setX(double x) {
        this.x = x;
    }
    
    public void setY(double y) {
        this.y = y;
    }
    
    public void setZ(double z) {
        this.z = z;
    }
    
    public double distanceToOrigin() {
        return Math.sqrt(x*x + y*y + z*z);
    }
}

PointTest 测试类：

import java.util.Scanner;

public class PointTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print('请输入点的x坐标: ');
        double x = scanner.nextDouble();
        
        System.out.print('请输入点的y坐标: ');
        double y = scanner.nextDouble();
        
        System.out.print('请输入点的z坐标: ');
        double z = scanner.nextDouble();
        
        Point point = new Point(x, y, z);
        double distance = point.distanceToOrigin();
        
        System.out.println('点到原点的距离为: ' + distance);
        
        scanner.close();
    }
}

你可以在控制台上输入点的坐标，然后程序会计算该点到原点的距离并输出。