问为什么Java编译器(特别是它的解析器)不能理解这个语句

EN

public class Foo
{
    public static class A
    {
        public static final boolean FLAG = false;
    }

    public final A A = new A();
}


public class Bar
{
    void method()
    {
         if (Foo.A.FLAG)  <<<< this is giving "Cannot make static ref to non-static field
            // do something
           ;
    }
}