Write a definition of a class named Point that can be used to store and manipula

Question

Write a definition of a class named Point that can be used to store and manipulate the location of a point in the 2D plane. Provide a constructor to initialize the private data with default values. You will need to declare and implement the following member functions:

A) A member function set that sets the private data after an object of this class is created.

C) A member function to swap the X and Y values.

D) Two functions to retrieve the current coordinates of the point (one for X and Y).

Write a test program that requests data for several points from the user, creates the points, then calls the member functions.

Explanation / Answer

import java.io.*;
import java.util.*;
class Point {
   private double x, y;
   Point(double x_value, double y_value) {
      x = x_value;
      y = y_value;
   }

   public void swap() {
      double temp = this.x;
      this.x = this.y;
      this.y = temp;
   }

   public double getX() {
      return this.x;
   }

   public double getY() {
      return this.y;
   }

   public static double distance(Point that) {
      return Math.sqrt(that.getX() * that.getX() + that.getY() * that.getY());
   }

   public static void main(String[] args){
       Scanner input = new Scanner(System.in);

       int i =0;
       double x1,y1;
       Point[] points = new Point[10];
       while(i<10){
         System.out.print("Enter x-coordinate: ");
         x1 = input.nextInt();
         System.out.print("Enter y-coordinate: ");
         y1 = input.nextInt();

         points[i] = new Point(x1,y1);
         System.out.println("Distance from origin is: "+ distance(points[i]));
         System.out.println("x-coordinate is: "+points[i].getX() +" and y-coordinate is: "+points[i].getY());
         System.out.println("After Swaping the coordinates: ");
         points[i].swap();
         System.out.println("x-coordinate is: "+points[i].getX() +" and y-coordinate is: "+points[i].getY());
         i++;
       }
    }
}

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