sub-2.java

import java.util.HashSet;
import java.util.Objects;
import java.util.Scanner;
import java.util.Set;

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

        // 나의 좌표 값
        System.out.println("나의 좌표 값을 입력하세요.");
        Coordinate myCoordinate = getCoordinate();

        // 입력 받은 좌표 값 중 나와 가장 가까운 좌표
        Coordinate closestCoordinate = null;
        double minDistance = Double.MAX_VALUE;

        System.out.println("타인이 임의의 좌표 값을 10번 입력하세요.");

        Set<Coordinate> coordinateSet = new HashSet<>();

        for (int i = 0; i < 10; i++) {
            System.out.println("좌표 #" + (i + 1));
            Coordinate currentCoordinate = getCoordinate();
            coordinateSet.add(currentCoordinate);
        }

        for (Coordinate currentCoordinate : coordinateSet) {
            double distance = calculateDistance(myCoordinate, currentCoordinate);

            if (distance < minDistance) {
                minDistance = distance;
                closestCoordinate = currentCoordinate;
            }
        }

        System.out.println("나와 가장 가까운 좌표: " + closestCoordinate);
    }

    private static Coordinate getCoordinate() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("X 좌표: ");
        int x = scanner.nextInt();
        System.out.print("Y 좌표: ");
        int y = scanner.nextInt();
        return new Coordinate(x, y);
    }

    private static double calculateDistance(Coordinate c1, Coordinate c2) {
        return Math.sqrt(Math.pow(c2.getX() - c1.getX(), 2) + Math.pow(c2.getY() - c1.getY(), 2));
    }
}

class Coordinate {
    private int x;
    private int y;

    public Coordinate(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    @Override
    public String toString() {
        return "(" + x + ", " + y + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        Coordinate that = (Coordinate) obj;
        return x == that.x && y == that.y;
    }

    @Override
    public int hashCode() {
        return Objects.hash(x, y);
    }
}