Thread: how do i use point 3d?

i dont know whats wrong whith this code but it gives me some errors.

the compiler says "cannot find symbol" on those lins:

*13)point = new Point3D(x,y,z);
*59)private java.lang.String toString()
*5) Point3D point;

public class Box3D extends java.lang.Object  {
 
   double width,length,height;
    Point3D point;
    //Constructor overloading:
    private  Box3D(double width, double length, double height)
    {
         this(0.0,0.0,0.0,width,length,height);
    }
    private  Box3D(double x, double y, double z, double width, double length,double height)
    {
        point = new Point3D(x,y,z);
 
        if (width <= 0) 
        {
            width = 1;
        }
        if (length <= 0)
        {
            length = 1;
        }
        if (height <= 0)
        {
            height = 1;
        }
        this.width = width;
        this.length = length;
        this.height = height;
    }
 
    //Methods:
    private  double getVolume()
    {    //Volume = (h)(w)(l)
        return (this.height * this.width * this.length);
    }
 
    private  boolean isInside(double pointX, double pointY, double pointZ)
    {
        //
        if(!pointX<=x){return false;}
        if(!pointT<=y){ return false;}
        if(!pointZ<=z){ return false;}
        else 
        {return true;}
    }
 
 private Point3D   getCenter() {  return ((this.height + this.width + this.length+this.x+this.y+this.z)/4);
 
    }
 
    private  void move(double dx, double dy, double dz)
    {
        //Moves the box by the given delta values.
        this.point.x += dx;
        this.point.y += dy;
        this.point.z += dz;
    }
    private  void scale(double factor)
    {
        //(Multiply all dimensions by
        //the specified factor).
        this.width *= factor;
        this.length *= factor;
        this.height *= factor;
    }
    private  java.lang.String toString()
    {
        //"(x, y, z)->(width, length, height)".
        return "("+this.point.x + ","+this.point.y + "," + this.point.z + ") -> " + "(" + width + "," + length + "," + height + ")";
    }}

The compiler looks like it doesn't know what a Point3D is...so you probably need to define this class, either through your own implementation or via an import...
If you wish to use the Vecmath Point3d object:

import javax.vecmath.Point3d;
//or more generally
import javax.vecmath.*;

So you wrote your own class, in which case you need to import Point3D into Box3D, and doing so will depend upon your package structure/directory structure. Given you have no package declaration, Point3D and Box3D must be in the same directory, so you can

import Point3D;

in this line it says "invalid method declaration;return type required"

I don't know what line you are referring, but I'll hazard a guess this error is due to the improper constructor:

 public Point[COLOR="Red"]3D[/COLOR](int x, int y,int z) {