What the hell is wrong with Java? http://stackoverflow.com/q/16159203/3140

Program.cs

using System;
using System.Threading;

class A {
    static Point currentPos = new Point(1,2);
    class Point {
        public int x;
        public int y;
        public Point(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }
    class Thready {
        void f(Point p) {
            lock(this) {}
            if (p.x+1 != p.y) {
                System.Console.WriteLine(p.x+" "+p.y);
                System.Environment.Exit(1);
            }
        }
        public void run() {
            while(currentPos == null);
            while(true)
                f(currentPos);
        }
    }
    public static void Main(String[] args) {

        new Thread(new ThreadStart(new Thready().run))
            .Start();
        while (true)
            currentPos = new Point(currentPos.x+1, currentPos.y+1);
    }
}