Recall that Coordinate is a class defined with two double va

Recall that Coordinate is a class defined with two double variables x and y representing the (x,y)-coordinate od a point on the xy plane. Suppose two coordinates c=(x,y) and c\'(x\",y\') are compared to each other as follows: 1. c is smaller than c\' if ether x<x\' or (x =x\' and y<y\'), 2. c is equal to c\' if x = x\' and y = y\', and 3. c is greater than c\' if either x>x\' and y>y\'. According to this rule, write an instance method public int compareTo(Coordinate o) that compares this with o that returns -1,0,+!, respectively to the above three cases.

Solution

import java.lang.*;
class Coordinate {

double x;
double y;
public Coordinate(double a,double b){
    x=a;
   y=b;
}

public int compareTo(Coordinate o)
{
/* return 0 if both coordinates are equal */
/* return -1 if \'o\' coordinate is less than the class coordinate */
/* return 1 if \'o\' coordinate is greater

   if( Double.compare(o.x,x) == 0 && Double.compre(o.y,y)==0){
       return 0;
   }
   else if((Double.compare(o.x,x)<0 && Double.compare(o.y,y)<0)||((Double.compare(o.x,x)=0 && Double.compare(o.y,y)<0))
   {
       return 1;
   }else if((Double.compare(o.x,x)>0 && Double.compare(o.y,y)>0)){
       return -1;
   }
}

}