public class Main {
  String a;
  public class A {
    public void B() {
      a = "hoge";
    }
  }
  
  Main() {
    A x = new A();
    x.B();
    String b = a;
    System.out.println(b);
  }
  
  public static void main(String[] args) {
    new Main();
  }
}