(All closest pairs of points) Revise Listing 8.3, FindNearestPoints.java, to display all closest pairs of points with the same minimum distance. Here is a sample run:

/*********************************************************************************
* (All closest pairs of points) Revise Listing 8.3, FindNearestPoints.java, to   *
* display all closest pairs of points with the same minimum distance.            *
*********************************************************************************/
import java.util.Scanner;

public class Exercise_08_08 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter the number of points: ");
		int numberOfPoints = input.nextInt();

		// Create an array to store points
		double[][] points = new double[numberOfPoints][2];
		System.out.print("Enter " + numberOfPoints + " points: ");
		for (int i = 0; i < points.length; i++) {
			points[i][0] = input.nextDouble();
			points[i][1] = input.nextDouble();
		}

		// p1 and p2 are the indices in the points' array
		int p1 = 0, p2 = 1; // Initial two points
		double shortestDistance = distance(points[p1][0], points[p1][1],
			points[p2][0], points[p2][p1]); // Initialize shortest Distance

		// Compute distance for every two points
		for (int i = 0; i < points.length; i++) {
			for (int j = i + 1; j < points.length; j++) {
				double distance = distance(points[i][0], points[i][1],
					points[j][0], points[j][1]); // Find distance

				if (shortestDistance > distance) {
					p1 = i; // Update p1
					p2 = j; // Update p2
					shortestDistance = distance; // Update shortestDistance
				}
			}
		}

		// Display result
		for (int i = 0; i < points.length; i++) {
			for (int j = 0; j < points.length; j++) {
				if (distance(points[i][0], points[i][1],
					points[j][0], points[j][1]) == shortestDistance)
					System.out.println("The closest two points are " +
						"(" + points[i][0] + ", " + points[i][1] + ") and (" +
							points[j][0] + ", " + points[j][1] + ")");
			}
		}
		System.out.println("Ther distance is " + shortestDistance);
	}

	/** Compute the distance between two points (x1, y1) and (x2, y2)*/
	public static double distance(
		double x1, double y1, double x2, double y2) {
		return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
	}
}