3,1 visibility
動かしたけど、なんか挙動が変。。
public class NoVisibility { private static boolean ready; private static int number; private static class ReaderThread extends Thread { public void run() { while (!ready) Thread.yield(); System.out.println(number); } } public static void main(String[] args) { System.out.println("init:" + ready); new ReaderThread().start(); number = 42; ready = true; } }