内部类中定义的方法不能在内部类中调用吗

package project;

public class WaiBuLei {
 public class NeiBuLei{
  public void show(){
   System.out.println("内部类与外部类！");
  }
  NeiBuLei m = new NeiBuLei();
  m.show();
 }
 public static void main(String[] args) {
  WaiBuLei n = new WaiBuLei();
  NeiBuLei h = n.new NeiBuLei();
  h.show();

 }
}