巢狀型別與外部型別存有特殊權限關係

//巢狀型別與外部型別共享一信任關係可互相存取至private權限的成員

class Outer{
  static private String outerStr="Outer attrib";
  static public void outerFun(){
    System.out.println ("outerFun use "+Inner.InnerStr);
  }
  static class Inner{
    static private String InnerStr= "Inner attrib";
    static public void InnerFun(){
      System.out.println ("innerFun use "+outerStr);
    }
  }
  public static void main(String[] arg)
  {
    Outer.outerFun();
    Outer.Inner.InnerFun();
  }
}