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// Definition for a point.
class Point {
    int x;
    int y;
    Point() { x = 0; y = 0; }
    Point(int a, int b) { x = a; y = b; }
}

PriorityQueue<Point> pq = new PriorityQueue<>(k, new Comparator<Point>() {
    @Override
    public int compare(Point p1, Point p2) {
        int diff = getDistance(p2, origin) - getDistance(p1, origin);
        if (diff == 0)
            diff = p2.x - p1.x;
        if (diff == 0)
            diff = p2.y - p1.y;
        return diff;
    }
});

intervals.sort(Comaparator.comparing(i -> i.start));

// Student : rollno, name...

public int compare(Student a, Student b){
    return a.rollno - b.rollno;
}

// Sorted by rollno
// 111 bbbb london
// 121 cccc jaipur
// 131 aaaa nyc