Question 30

package com.udayankhattry.ocp;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
 
class Point {
    private int x;
    private int y;
    
    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    
    @Override
    public String toString() {
        return "Point(" + x + ", " + y + ")";
    }
}
 
public class TestPoint {
    public static void main(String [] args) {
        List<Point> points = new ArrayList<>();
        points.add(new Point(4, 5));
        points.add(new Point(6, 7));
        points.add(new Point(2, 2));
        
        Collections.sort(points, new Comparator<Point>() {
            @Override
            public int compare(Point o1, Point o2) {
                return o1.x - o2.x;
            }
        });
        System.out.println(points);
    }
}