Question

MODIFY your code to:

1. add a new point, locationx, that has 3 dimensions, and are set by PASSING IN the arguments for the X and Y coordinates. The Z coordinate can be hard-coded (extra credit if it is passed in too). ADD CODE to print the new point location, and note to the user it is the new point using input arguments

2. Add 2 new methods to the Point3d class, each accepting 3 values as input.

3. pAdd(a1, a2, a3) will ADD a1 to the x coordinate, add a2 to the Y coordinate and add a3 to the z coordinate.

   1. example: point (1,2,3) calls 'add' with params (-1, 1, -1) results in point moved to new location (0,3,2). CALL the new add method using the new locationx point. PRINT the original location, the ADD parameters and the NEW location.
   2. pSubtract(a1, a2, a3) qill do the same, but subtract instead of add. Using the SAME example as above, the resulting location would be (2,1,4) (remember, subtracting a negative results in an addition... you do not need to 'code' that. JAVA will do the subtraction correctly).

   3. Point3D

      package com.java24hours;
      import java.awt.*;
      public class Point3D extends Point {
      public int z;
      public Point3D(int x, int y, int z) {
      super(x,y);
      this.z = z;
      }
      public void move(int x, int y, int z) {
      this.z = z;
      super.move(x, y);
      }
      public void translate(int x, int y, int z) {
      this.z += z;
      super.translate(x, y);
      }
      }

      --------
      PointTester

      package com.java24hours;
      import java.awt.*;
      class PointTester {
      public static void main(String[] arguments) {
      Point location1 = new Point(11,22);
      Point3D location2 = new Point3D(7,6,64);
      System.out.println("The 2D point is at (" + location1.x
      + ", " + location1.y + ")");
      System.out.println("It's being moved to (4, 13)");
      location1.move(4,13);
      System.out.println("The 2D point is now at (" + location1.x
      + ", " + location1.y + ")");
      System.out.println("It's being moved -10 units on both the x "
      + "and y axes");
      location1.translate(-10,-10);
      System.out.println("The 2D point ends up at (" + location1.x
      + ", " + location1.y + ")\n");
      System.out.println("The 3D point is at (" + location2.x
      + ", " + location2.y + ", " + location2.z + ")");
      System.out.println("It's being moved to (10, 22, 71)");
      170 HOUR 12: Making the Most of Existing Objects
      location2.move(10,22,71);
      System.out.println("The 3D point is now at (" + location2.x
      + ", " + location2.y + ", " + location2.z + ")");
      System.out.println("It's being moved -20 units on the x, y "
      + "and z axes");
      location2.translate(-20,-20,-20);
      System.out.println("The 3D point ends up at (" + location2.x
      + ", " + location2.y + ", " + location2.z + ")");
      }
      }

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. If not, PLEASE let me know before you rate, I’ll help you fix whatever issues. Thanks

//Point3D.java

package com.java24hours;


import java.awt.*;

public class Point3D extends Point {
        public int z;

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

        public void move(int x, int y, int z) {
                this.z = z;
                super.move(x, y);
        }

        public void translate(int x, int y, int z) {
                this.z += z;
                super.translate(x, y);
        }

        // method to add a1 to the x coordinate, add a2 to the Y coordinate and add
        // a3 to the z coordinate.
        public void pAdd(int a1, int a2, int a3) {
                x += a1;
                y += a2;
                z += a3;
        }

        // method to subtract a1 from the x coordinate, a2 from the Y coordinate and
        // a3 from the z coordinate.
        public void pSubtract(int a1, int a2, int a3) {
                x -= a1;
                y -= a2;
                z -= a3;
        }
}

//PointTester.java

package com.java24hours;

import java.awt.*;
import java.util.Scanner;

class PointTester {
        public static void main(String[] arguments) {
                Point location1 = new Point(11, 22);
                Point3D location2 = new Point3D(7, 6, 64);
                System.out.println("The 2D point is at (" + location1.x + ", "
                                + location1.y + ")");
                System.out.println("It's being moved to (4, 13)");
                location1.move(4, 13);
                System.out.println("The 2D point is now at (" + location1.x + ", "
                                + location1.y + ")");
                System.out.println("It's being moved -10 units on both the x "
                                + "and y axes");
                location1.translate(-10, -10);
                System.out.println("The 2D point ends up at (" + location1.x + ", "
                                + location1.y + ")\n");
                System.out.println("The 3D point is at (" + location2.x + ", "
                                + location2.y + ", " + location2.z + ")");
                System.out.println("It's being moved to (10, 22, 71)");
                // 170 HOUR 12: Making the Most of Existing Objects
                location2.move(10, 22, 71);
                System.out.println("The 3D point is now at (" + location2.x + ", "
                                + location2.y + ", " + location2.z + ")");
                System.out.println("It's being moved -20 units on the x, y "
                                + "and z axes");
                location2.translate(-20, -20, -20);
                System.out.println("The 3D point ends up at (" + location2.x + ", "
                                + location2.y + ", " + location2.z + ")");

                // defining a scanner to read input
                Scanner sc = new Scanner(System.in);
                // asking and reading x, y and z values for a new point
                System.out.print("\nEnter x, y and z values for a new point: ");
                // creating a Point3D object using the next 3 integer inputs from
                // keyboard
                Point3D locationx = new Point3D(sc.nextInt(), sc.nextInt(),
                                sc.nextInt());

                // printing new point
                System.out.println("The new 3D point is at (" + locationx.x + ", "
                                + locationx.y + ", " + locationx.z + ")");
                System.out.println("Adding (1,2,3) to this new point");
                // testing pAdd()
                locationx.pAdd(1, 2, 3);
                System.out.println("The 3D point is now at (" + locationx.x + ", "
                                + locationx.y + ", " + locationx.z + ")");
                System.out.println("Subtracting (1,2,3) from this new point");
                // testing pSubtract()
                locationx.pSubtract(1, 2, 3);
                // the point should be back at original location
                System.out.println("The 3D point is now at (" + locationx.x + ", "
                                + locationx.y + ", " + locationx.z + ")");
        }
}

/*OUTPUT*/

The 2D point is at (11, 22)
It's being moved to (4, 13)
The 2D point is now at (4, 13)
It's being moved -10 units on both the x and y axes
The 2D point ends up at (-6, 3)

The 3D point is at (7, 6, 64)
It's being moved to (10, 22, 71)
The 3D point is now at (10, 22, 71)
It's being moved -20 units on the x, y and z axes
The 3D point ends up at (-10, 2, 51)

Enter x, y and z values for a new point: 5 8 15
The new 3D point is at (5, 8, 15)
Adding (1,2,3) to this new point
The 3D point is now at (6, 10, 18)
Subtracting (1,2,3) from this new point
The 3D point is now at (5, 8, 15)