Question

In JAVA

Design a class named Point that meets the following requirements:

• Two data fields x and y for representing a point with getter methods.
• A no-arg constructor that constructs a point for (0, 0).
• A constructor that constructs a point with the specified x and y values.
• Override the equals method. Point p1 is said to be greater than point p2 if p1.x == p2.x and p1.y == p2.y.
• Implement the Comparable<Point> interface and the compareTo method. Point p1 is said to be greater than point p2 if p1.x > p2.x or if p1.x == p2.x and p1.y > p2.y.
• Override the toString() method to return a string as [x value, y value].

Write a test program that creates a Point object p1 at point (3,4) and another Point object p2 at point (3.4, 1.4). Call the p1’s equals method with p2 as its argument and print the result. Call the p2’s equals method with p1 as its argument and print the result. Call the p1’s compareTo method with p2 as its argument and print the result. Call the p2’s compareTo method with p1 as its argument and print the result.

Answer 1

1. /************************** Point Class **********************************/

class Point implements Comparable<Point>
{
double x,y;
Point()
{
x=y=0;
}
Point(double x, double y)
{
this.x = x;
this.y = y;
}
@Override
public boolean equals(Object o)
{
Point p = (Point)o;
return this.x == p.x && this.y == p.y;
}
@Override
public int compareTo(Point p)
{
int result = Double.compare(this.x,p.x);
return result == 0 ? Double.compare(this.y,p.y) : result;
}
@Override
public String toString()
{
return "[x "+ this.x + ",y " + this.y + "]";
}
}

2. /********************************Test.java**********************************************/
public class Test
{
   public static void main(String[] args) {
      
       Point p1 = new Point(3,4);
       Point p2 = new Point(3.4,1.4);
      
       System.out.println(p1.toString());
       System.out.println(p2.toString());
      
       System.out.println(p1.equals(p2));
       System.out.println(p2.equals(p1));
      
       System.out.println(p1.compareTo(p2));
       System.out.println(p2.compareTo(p1));
   }
}

3. /***************************Output*************************************/