如何使用构造函数初始化内部类的新字段？

Question

If I have this class and I want to initialize a new field of type Element , how I can do that

public class MyLinkedList{

   protected Element head, tail;

   public final class Element{
      Object data;
      int priority; 
      Element next;

      Element(Object obj, int priorit, Element element){
       data = obj;
       priority = priorit;
       next = element;
      }
   }
}

when I try to do this it gave me an error

public class PriorityTest{
    public static void main(String[]args){  
        MyLinkedList.Element e1 = new MyLinkedList.Element("any", 4, null); 
    }
}

Answer 1

Make the inner calss static

public class MyLinkedList{

   protected Element head, tail;

   public static final class Element{
      Object data;
      int priority;
      Element next;

      Element(Object obj, int priorit, Element element){
       data = obj;
       priority = priorit;
       next = element;
      }
   }

  public static void main(String[]args){
      MyLinkedList.Element e1 = new MyLinkedList.Element("any", 4, null);
  }
}

Answer 2

Try this

MyLinkedList.Element e1 = new MyLinkedList().new Element("any", 4, null);

your inner class is not static so you need to create an object of outer class first.