Methods, classes and records

public class Main {
    record Point(int x, int y) {
        double distance() {
            return Math.sqrt(x * x + y * y);
        }
    }

    static class Counter {
        private int value;

        Counter(int start) {
            this.value = start;
        }

        int next() {
            return ++value;
        }
    }

    static int square(int x) {
        return x * x;
    }

    static double square(double x) {
        return x * x;
    }

    public static void main(String[] args) {
        System.out.println(square(4) + " " + square(1.5));
        Point p = new Point(3, 4);
        System.out.println(p + " " + p.x() + " " + p.distance());
        Counter c = new Counter(10);
        c.next();
        System.out.println(c.next());
    }
}