if (null == n) System.out.println("This is silly");
	public static void main(String[] argv) {		NullDeref n = new NullDeref();		n = null;		if (n == null) {			System.out.println("Hey yo, it's null");			System.out.println("Bad idea: " + n.x);		} else {			System.out.println("Safe to deref here: " + n.x);		}		// We don't detect that this can fail, because		// currently we don't have a way of remembering that		// n was originally null and that the IF statement didn't		// modify it.		n.x = 42;	}