Question: For these exercises you are required edit in the Comparable interface implementation, a compareTo() method. Point class // A Point object represents a pair of
For these exercises you are required edit in the Comparable interface implementation, a compareTo() method.
Point class
// A Point object represents a pair of (x, y) coordinates.
// Class invariant: x >= 0 && y >= 0. (Quadrant I only)
public class Point {
private int x;
private int y;
// Constructs a new point at the given (x, y) location.
// pre: x >= 0 && y >= 0
public Point(int x, int y) {
if (x
throw new IllegalArgumentException();
}
this.x = x;
this.y = y;
}
// Constructs a new point at the origin, (0, 0).
public Point() {
this(0, 0); // calls Point(int, int) constructor
}
// Returns the distance between this Point and (0, 0).
public double distanceFromOrigin() {
return Math.sqrt(x * x + y * y);
}
// Returns whether o refers to a point with the same (x, y)
// coordinates as this point. Robust version.
public boolean equals(Object o) {
if (o instanceof Point) {
Point other = (Point) o;
return this.x == other.getX() && this.y == other.getY();
} else { // not a Point object
return false;
}
}
// Returns the x-coordinate of this point.
public int getX() {
return this.x;
}
// Returns the y-coordinate of this point.
public int getY() {
return this.y;
}
// Returns a String representation of this point.
public String toString() {
return "(" + this.x + ", " + this.y + ")";
}
// Returns a new point, shifted from this one by dx and dy.
// pre: x + dx >= 0 && y + dy >= 0
public Point translate(int dx, int dy) {
return new Point(this.x + dx, this.y + dy);
}
}
PointMainMin class
// A client program that deals with simple points.
// Minimal version, to accompany immutable Point class.
public class PointMainMin {
public static void main(String[] args) {
// create two Point objects
Point p1 = new Point(7, 2);
Point p2 = new Point(4, 3);
// print each point and its distance from the origin
System.out.println("p1 is " + p1);
System.out.printf("distance from origin = %3.2f ",
p1.distanceFromOrigin());
System.out.println("p2 is " + p2);
System.out.printf("distance from origin = %3.2f ",
p2.distanceFromOrigin());
}
}
Modify the point class from Chapter 8 so that it defines a natural ordering by implementing the Comparable interface. Compare the points by MathML must be formed by a
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